Test debut At the end of the season, Miller was selected for the New Zealand tour, under the captaincy of Queensland's
Bill Brown. Miller started the tour well, top-scoring with 139 against
Auckland. Along with seven other debutants, Miller made his test debut in the match against
New Zealand at the
Basin Reserve in
Wellington, a match that was retrospectively accorded Test status in 1948. On a
sticky wicket, New Zealand won the toss and batted. Miller was not required to bowl in the first innings as O'Reilly and
Ernie Toshack skittled the home side for just 42. taking 2/6 in six overs before a flare-up of his back injury forced him to be removed from the attack. Australia bowled their hosts out for 54, securing an innings victory. Despite the scare over his back complaint, Miller returned from New Zealand to play in the 1946 season, which turned out to be his last season in the VFL; St Kilda finished second-last. Miller played with more aggression than during his pre-war years and his high leaping
marks were a noted feature of a season that saw him chosen to represent Victoria against South Australia. Miller was discharged from the RAAF on 26 June 1946, Under such circumstances, Miller contemplated quitting Australian cricket and accepting a professional contract with
Rawtenstall in the
Lancashire League, valued at £1,000 per year, for three seasons. With advertising and commercial commitments likely to triple this figure, playing in England would have been approximately ten times more lucrative than continuing in Australia. Miller's contract would see him in England until he was 30, effectively ending his career for Australia. Furthermore, it would have prevented him from playing Australian football during the winter. Miller weighed it up and opted to sign the contract that tied him to Rawtenstall, his duties to start with the onset of the English season in April 1947. In the meantime, Miller had the upcoming Test series against England in 1946–47 to look forward to. He therefore approached his employers for two months leave so that he could travel to the United States to marry Wagner, which would allow him time to return in preparation for the international series. Vacuum Oil refused, so, with the comfort of job security in England, Miller resigned. Miller left Australia at the end of the football season in late August, amid press speculation that he might not return. He was reunited in Boston with Wagner after more than three years of separation and they married on 21 September 1946. Miller and his new bride returned to Australia in November. In a Shield match in front of Bradman at the
Adelaide Oval, Miller struck form with 188 and 2/32 with the ball.
Wisden said Miller's innings was "one of the finest batting displays ever seen at Adelaide". Bradman saw Miller as a top-order batsman and as the new ball partner for Lindwall. Although Miller was a reluctant bowler, Bradman felt that he was crucial to his strategy of attacking England's strong batting line-up with express pace. Miller made his Ashes debut in the
first Test in Brisbane. Bradman opted for six front-line bowlers, with Miller as high as number five in the batting order. Australia batted first, Miller coming in at 3/322. He played aggressively to reach his fifty in just 80 minutes, striking a six onto the roof of the members' stand at
long on, the biggest hit at the ground at the time, Miller was given the new ball along with Lindwall and he took his first Ashes wicket, bowling Hutton as England closed at 1/21. The following day, the pitch had turned into a
sticky wicket following a heavy tropical storm. On the unpredictable surface, Edrich was struck around 40 times on the body. Miller cut through the English top order, removing Edrich, Washbrook, Compton and
Jack Ikin on the fourth morning, finishing with 7/60 as England made 141 and were forced to
follow on. Miller took two wickets, including the dismissal of Hutton with first ball of the second innings as England fell to defeat by an innings and 334 runs and Miller had match figures of 9/77. During that first Test, an incident occurred, coloured by Miller's wartime service, that soured his relationship with Bradman and his feelings towards Test cricket.
Michael Parkinson described it as follows: Keith Miller was deeply affected by the Second World War. It changed him ... In the first post-war Ashes Test ... England were caught on a sticky ... [and] Bill Edrich came in. He'd had a serious war and he survived and Miller thought, "He's my old Services mate. The last thing he wants after five years' war is to be flattened by a cricket ball, so I eased up. Bradman came up to me and said, 'Don't slow down, Keith. Bowl quicker.' That remark put me off Test cricket. Never felt the same way about it after that." In the
Second Test in Sydney. Miller had a quiet match, scoring 40 and taking one wicket on a spin-friendly pitch as Australia secured another innings victory, but showed he was in prime batting form when he returned to the Sheffield Shield. Playing against New South Wales, he hammered three sixes in one over and made 153 of a 271-run partnership with
Merv Harvey in just over three hours, setting up an innings victory.
Bill Ponsford said that it was the hardest hitting he had ever seen. The Third Test was Miller's first in his home town. He had a mediocre game in a drawn match, scoring 33 and 34, and taking two wickets. Off the pitch, Miller privately decided that he would not honour his Rawtenstall contract. Back in a good frame of mind for the Fourth Test in Adelaide, Miller took one wicket in each innings, and accumulated 67 runs in the opening 71 minutes, to reach his maiden Test century. The Englishmen utilised
leg theory to prevent easy scoring, but as the tail began to be dismissed, Miller accelerated, launching drives into the crowd, despite the presence of four men on the
fence. Miller ended unbeaten on 141 but the match petered out into a high-scoring draw. Before the last Test, Miller played for Victoria against England, taking 4/65. The
Fifth Test. saw Miller take a wicket in each innings. Australia were left a target of 214 runs on a wearing wicket. Wright beat Miller with three consecutive leg breaks, but Miller survived and struck consecutive boundaries on the way to reaching the target. Australia had taken the series 3–0; Miller scored 384 runs at 76.80 and took 16 wickets at 20.88, which placed him second in both the batting and bowling averages, to Bradman and Lindwall respectively. For the 1947–48 Australian season, Miller transferred to
New South Wales (NSW), for whom he played the remainder of his Sheffield Shield career. He also represented the New South Wales interstate football team at the
1947 Hobart Carnival, as vice captain. This made him one of the few players to play both football and cricket for two states. who were on their first tour to Australia. India were well beaten, losing 4–0, three of the four defeats by an innings. Miller was required to bat just once in each Test, accumulating 185 runs at 37.00, including two half-centuries, His 58 in the First Test at Brisbane featured many big hits.
Invincibles tour Donald Bradman's
1948 touring party to England has become known to cricket history as
The Invincibles, remaining undefeated in its 31 matches. Miller started the tour strongly, scoring a hard-hitting 50 not out against
Worcestershire, and an unbeaten 202 against
Leicestershire. In the next match against
Yorkshire, Miller took 6/42, including the prized wicket of
Hutton, as the home team were demolished for just 71. In a later match, against
Essex, Miller was involved in a famous incident that is frequently cited when his character is discussed; it also spotlighted his differences with Bradman. On a day when the Australians set a world-record of 721 runs in a single day, Miller came to the crease with his side already dominating, with the score 2/364. He deliberately allowed himself to be
bowled first ball, much to Bradman's displeasure, in a protest against the one-sided nature of the contest. Australia then took on
the MCC at
Lord's; effectively a dress rehearsal for the Tests as many of England's Test players were in the MCC team. Miller scored 163 in 250 minutes, hitting 20 fours and three sixes in another innings win. Soon after, Rawtenstall dropped the contract dispute with Miller after being offered compensation. Following another good all-round performance against
Hampshire, top-scoring in the first innings and taking 5/25 in the second, Miller went into the First Test (at
Trent Bridge) in fine form. On the first morning, Miller bowled Hutton and Compton on his way to 3/38, helping Australia dismiss England cheaply and seize the initiative. Miller scored a duck, but Australia took a 344-run lead on the first innings. In the second innings, he resumed his battle with Hutton and Compton, delivering five bouncers in the last over of the day. The next day, he bowled Hutton for 74 and then
bounced Compton, causing him to
fall onto his stumps for 184. Australia won by eight wickets, Miller ending with 4/125 for the second innings and 7/163 for the match. Miller was unfit to bowl during the Second Test at Lord's. During England's first innings, Bradman threw Miller the ball, hoping that he would reverse his decision not to bowl. Miller refused and returned the ball, citing his back. Miller's action generated news headlines, journalists believing that he had disobeyed Bradman. Miller wanted to play purely as a batsman, feeling that the workload of bowling would hinder his run-scoring. However, Bradman was intent on going through the tour undefeated, and utilised his bowling options to the full, to maximise the Australians’ chances of winning. Lindwall and Miller were the first-choice pace duo, regarded as one of the greatest speed pairings in the history of cricket, whereas the latter was just one of many accomplished batsmen in the team. As a result, the Australian skipper valued Miller more as an opening bowler. In the second innings, Miller's first ball was a
hat-trick ball from English captain
Norman Yardley; he survived a loud
leg before wicket appeal and then hit a six into the grandstand, on his way to 74. Australia declared at 7/460, 595 runs ahead. Miller took three catches as Australia won by 409 runs. After the Lord's Test, Miller enjoyed a night out and returned to the team hotel after daybreak the next morning. Australia were due to play
Surrey at
The Oval that day. With Australia in the field, Bradman sent Miller to the
fine leg boundary as a punishment—between overs, he was forced to walk the length of the field. One of the spectators felt sorry for Miller and lent him his bicycle, which Miller used to cycle around the circumference of the ground. Miller had a quiet Third Test at
Old Trafford, taking one wicket and scoring 31 as the match ended in a draw. He struck Edrich on the body before Bradman ordered him to stop. When fit, Miller opened the Test bowling with Lindwall, and the pair bowled in short and fiery bursts with the new ball. The English cricket authorities had agreed to make a new ball available every 55 overs. The pre-existing rule stipulated that a replacement ball would be available every 200 runs, which usually took much more time to accumulate. This played directly into the hands of the Australians with their vastly stronger pace attack, as a new ball is ideal for fast bowling. Bradman thus wanted to preserve his two first-choice bowlers for a fresh attack every 55 overs. With 13 wickets in the Tests, Miller was third among the Australians behind Lindwall and Johnston, who took 27 apiece. Owing to his fragility, Miller was used sparingly compared to the other four Australian frontline bowlers: Toshack and Johnson each delivered more than 170 overs despite playing in one less Test, while Lindwall bowled 224 and Johnston 306 in five matches. In all first-class matches, Miller took 56 wickets at 17.58 and held onto 20 catches. There were many consecutive matches during the tour with no intervening rest day, so Bradman ensured that his leading pace duo remained fresh for the new ball bursts in the Tests by giving them a smaller proportion of the bowling during the tour matches. During all first-class matches, Johnston bowled 851.1 overs, Johnson 668, Lindwall 573.4 and Toshack 502, while Miller bowled only 429.4 overs.
Doug Ring—who was only selected in one Test—bowled 542.4 overs, while
all rounders
Colin McCool and Loxton bowled 399.4 and 361.2 overs respectively. McCool did not play in any Tests, while Loxton was only entrusted with 63 overs against England. in order to keep him fresh for the Tests. In reply, Australia were struggling at 3/68 in reply on the third morning.
Neil Harvey, playing his first Ashes Test, joined Miller at the crease. The pair launched a counterattack, with Miller taking the lead. He hoisted
Jim Laker's first ball over square leg for six. Miller struck consecutive sixes over long off and the
sightscreen respectively. This allowed Australia to seize the initiative; Harvey joined in and hit consecutive boundaries against Laker. Miller then lifted another six over
long off, and another over
long on from
Norman Yardley. He was dismissed for 58 attempting another six. The partnership had yielded 121 runs in only 90 minutes, and was described by Wisden as a "hurricane".
John Arlott described the innings as the most memorable that he had witnessed.
Jack Fingleton said that he had never "known a more enjoyable hour" of "delectable cricket". The momentum swung and Australia finished at 457 on the fourth day, having added almost 396 in one day's play. Miller took 1/53 in the second innings as Australia were set a world record chase of 404 on the final day. He made only 12 but Australia broke the world record to take a 3–0 lead. The Australians moved onto the next match against
Derbyshire, where Miller scored a half-century and took 3/31 in an innings victory. In a match against
Lancashire,
Jack Ikin had reached 99 despite being repeatedly hit. Miller refused to bowl to Ikin, saying that he felt the batsman deserved a century. Lindwall was given the ball and promptly removed Ikin for 99. Miller bowled
John Dewes with his second ball and then removed
Jack Crapp without scoring, leaving England at 4/23. Miller ended with 2/5 as Lindwall (6/20) cut down the home team for 52. In his last Test innings for the summer, Miller scored five. Australia led by 337 on the first innings and Miller dismissed Hutton and Crapp to end with 2/22 as Australia won by an innings and took a 4–0 series win. Miller ended the Tests with 184 runs at 26.28 and 13 wickets at 23.15. He took eight catches. Australia went through the remaining tour matches unbeaten to end the summer without a defeat. After the tour, Bradman was full of praise for Miller, though somewhat critical of his aggressive batting: