In 1922 he finished joint runner-up, with
Eustace Headlam, in the
Tasmanian Open behind his father. The leading four qualified for the Tasmanian Amateur, but both Nettlefolds lost their semi-final matches, Len losing to Headlam. Nettlefold spent most of 1923 on a world tour with his parents. The
Tasmanian Open was not played from 1923 to 1929 but there continued to be a 36-hole qualifying stage for the Tasmanian Amateur, with the leading 8 playing in the match play. After missing 1923, Nettlefold led the qualifying in 1924. In the match play he beat his father in the semi-final and then beat C. H. Richardson 11&10 in the final to win his first Tasmanian Amateur title, having been 10 up after the morning round. In 1925, Nettlefold played in his first championship meeting, in Sydney. He played well enough in the
Australian Open to qualify for the
Australian Amateur, losing in the quarter-finals 8&7 to
Harry Sinclair. Later in the year he was tied for third place in qualifying for the Tasmanian Amateur. He again beat his father to reach the final but lost to
Hugh Smith by two holes. In July 1926 Nettlefold played in the South Australian Amateur at Royal Adelaide. He was one of the eight qualifiers and met his father in the first match-play round, winning 3&2. He went on to reach the final before losing to
Legh Winser 3&1. He then travelled to Melbourne to play in the
Victorian Amateur Championship, losing to
Alex Russell in the semi-final. Nettlefold returned to Adelaide to play in the championship meeting. He finished tied for 11th place in the
Australian Open, which was won by
Ivo Whitton. In the
Australian Amateur that followed, he met Whitton in the final, winning by two holes. Nettlefold only finished second in the qualifying for the Tasmanian Amateur, but won the championship, beating
Terence Brown 5&4 in the final. Nettlefold and his father travelled to Europe again in 1927, arriving in late April. He played in the
Amateur Championship in late May, reaching the quarter-finals before losing 4&3 to
William Tweddell, the eventual winner. He played in the
1927 Open Championship in July, on the
Old Course at St Andrews. He qualified after rounds of 80 on the Old Course and 75 on the New Course. He took an early lead after a first round of 71, although he was pushed back into second place at the end of the day by
Bobby Jones's 68. He then had further rounds of 81, 85 and 81 to finish tied for 52nd place. In early August he was the runner-up in the Swiss Amateur. Nettlefold returned too late to defend his Australian Amateur title but in time to play in the Tasmanian Amateur. He led the qualifying but lost in the first round of the match-play to
Eustace Headlam. The 1928 championship meeting was held at
Royal Sydney. After the first day of the
Australian Open Nettlefold was one stroke behind the three leaders. He faded a little on the last day but finished alone in fifth place, the leading amateur. The following week he won the
Australian Amateur, beating
Stan Keane in the final. He had a remarkable win in the semi-final against
George Fawcett. Fawcett was 5 up with 7 holes to play, but Nettlefold won at the 38th hole. After returning to Tasmania, he tied with his father for first place in the qualifying for the Tasmanian Amateur but lost 8&7 in the final to
Terence Brown. In 1929 he reached the quarter-finals of the
Australian Amateur, losing 3&2 to
Mick Ryan. He won the Tasmanian Amateur for the third time, leading the qualifying and then beating
Ivo Whitton in the semi-final at the 19th hole, and
Hugh Smith 8&7 in the final. In 1930 Nettlefold had his best chance of winning the
Australian Open. He was in second place, a stroke behind
Frank Eyre, after the first 36 holes. He scored 74 in the third round, to be level with Eyre, and six ahead of the rest of the field. However, he took 87 in the final round and finished tied for 5th place. In the
Australian Amateur he lost in the quarter-finals to the eventual winner,
Harry Hattersley, a match that went to the 38th hole. Earlier in the year he had reached the final of the
Victorian Amateur Championship, losing 2&1 to
Mick Ryan. He won both the
Tasmanian Open and the Tasmanian Amateur in 1930. He won the
Tasmanian Open but lost 3&1 to
Terence Brown in the final of the Tasmanian Amateur. Nettlefold reached the semi-finals of the 1932 Australian Amateur at Royal Adelaide, losing 3&2 to
Reg Bettington. He also won the Tasmanian Open and the Tasmanian Amateur. He finished down the field in the Tasmanian Open and, although he reached the final of the Tasmanian Amateur, he lost 5&4 to
Peter Brown. Nettlefold won both the Tasmanian Open and the Tasmanian Amateur in 1934. He qualified for the
Australian Amateur at Royal Sydney but lost again to Ferrier, this time in the first round. After 1934 Nettlefold played less golf outside Tasmania, although he continued to have success domestically. He won the
Tasmanian Open in 1935, 1936, 1937 and 1947 and the Tasmanian Amateur in 1936 and 1939, completing 8 wins in each event. The team arrived in mid-May and played in
The Amateur Championship at Troon. Nettlefold had been ill and lost in the first round. The team stayed for the
1938 Open Championship in early July but Nettlefold failed to qualify. Nettlefold made an
albatross-2 at the 517-yard 16th hole at
Portmarnock during the second round of the
Irish Open but only just qualified for the final day. Nettlefold was president of the Tasmanian Golf Council from 1947 to 1960 and a Tasmanian state delegate to the
Australian Golf Union for periods between 1932 and 1956. ==Later life==