Flood signed with the
Cincinnati Redlegs in
1956 and made a handful of appearances for the team in 1956–57. However, Flood was deemed expendable with future star centerfielder
Vada Pinson preparing to be promoted to the majors. He was traded to the St. Louis Cardinals in December 1957. For the next 12 seasons, he became a fixture in center field for St. Louis; although he struggled at the plate from
1958 to
1960, his defensive skill was apparent. He had his breakthrough year at the plate after
Johnny Keane took over as manager in
1961: he batted .322, followed by .296 in
1962 with 11
home runs. He continued to improve offensively in
1963, hitting .302 and scoring a career-high 112
runs, third-most in the NL; he also had career bests in
doubles (34),
triples (9) and
stolen bases (17) and collected 200 hits in an NL-leading 662
at bats. In that year he received the first of his seven consecutive Gold Gloves. He earned his first
All-Star selection in
1964. He batted .311. His 679 at-bats led the NL again and were the fifth-highest total in league history to that point, setting a team record by surpassing
Taylor Douthit's 1930 total of 664;
Lou Brock broke the team record three years later with 689. He tied for tops in hits with The Pittsburgh Pirates' Roberto Clemente with 211. Batting leadoff in the
World Series against the
New York Yankees, he hit only .200 but scored in three of the Cardinal victories as the team won in seven games for its first championship since
1946. In
1965, Flood had his greatest power output with 11 home runs and 83
runs batted in while he was hitting .310. He made the All-Star team again in
1966, a season in which he did not commit a single
error in the outfield; his record errorless streak of 226 games (NL record for an outfielder) and 568
total chances (major league record) ran from September 3, 1965, to June 4, 1967. In
1967, he had his highest batting mark with a .335 average (though his other batting totals fell off from previous years), helping the Cardinals to another championship. In the
World Series against the
Boston Red Sox, he hit a woeful .179 but made some crucial contributions. In game 1, he advanced Brock to third base twice, putting him in position to score both runs in a 2–1 victory; in game 3, he drove Brock in with the first run of a 5–2 win. As team co-
captain (with
Tim McCarver) in
1968 he had perhaps his best year, earning his
third All-Star selection and finishing fourth in the
MVP balloting (won by teammate
Bob Gibson) on the strength of a .301 batting average and 186 base hits. Against the
San Francisco Giants that year, Flood was involved in the final outs of the first back-to-back
no-hitters in major league history. On September 17, he struck out for the final out of
Gaylord Perry's 1–0 gem. The next day, he caught
Willie McCovey's fly ball for the final out of
Ray Washburn's 2–0 no-hitter. Torrential rains the night before had soaked the Busch Stadium field, and had he not momentarily lost his footing chasing a
Jim Northrup fly ball (ruled a triple) with two out in the seventh inning of game 7 of the
World Series against the
Detroit Tigers, the Cardinals might have won their third championship of the decade; Detroit scored twice on the play, with Northrup later coming in for a 3–0 lead, and won the game, 4–1. Up to that point, Flood had been enjoying the best series of his career despite dealing with personal problems at home, hitting .286 with three steals. After the season ended, Flood was upset when Cardinals' president
Gussie Busch, and CEO of team owner
Anheuser-Busch, offered him only a $5,000 raise, far short of the $90,000 salary he believed he deserved after his stellar regular season. He believed Busch, with whom he had previously enjoyed a close personal friendship, was expressing his displeasure over the error that had likely cost the team the Series. While Busch eventually relented, Flood took it personally when Busch publicly chewed the team out after most players
boycotted spring training before the 1969 season for a week, accusing players of forgetting that fans were what kept the sport going (although he did not mention any player by name). In
1969, despite the lower pitching mound instituted that season, which saw a general rise in batting average league-wide, Flood's batting average slipped to .285. His brother was arrested during the season. Late in the season, he publicly criticized the team for reorganizing before they were officially eliminated. He received his seventh Gold Glove that season just as other events in his career began to affect the entire sport. Flood collected the first hit in a major league regular-season game in Canada. He doubled off
Montreal Expos pitcher
Larry Jaster in the first inning of the Expos' inaugural home game on April 14 at
Jarry Park. (Jaster, a Cardinal teammate of Flood's the year before, had been selected by the Expos in the
expansion draft.) ==Challenging the reserve clause==