He went on to become one of the most feared baserunners in baseball history.
The six-time All-Star originally set the career stolen base record with 938, which stood from the time he retired in 1979 until Rickey Henderson surpassed the mark in 1991.
© Jasen Vinlove-USA TODAY Sports Cardinals legend Lou Brock has died at the age of 81.
Over his career, he helped the Cardinals to three pennants and two World Series championships, and was elected to the Baseball Hall of Fame in 1985. That was a single-season record at the time, and he retired as baseball's all-time leader in steals.
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Brock led the National League in steals eight times and is still its career stolen-bases leader.
"Lou Brock personified the aggressive style of play the Cardinals helped bring to our game in the '60s and '70s, including rising to the occasion with his bat and on the base paths for the club's World Series teams in 1964, 1967, and 1968", MLBPA executive director Tony Clark said in a statement.
Brock joined a team that was in sixth place, despite having stars such as pitcher Bob Gibson, a future Hall of Famer, along with Tim McCarver, Curt Flood and Ken Boyer, who would be named the National League's most valuable player that season. Brock led the Cardinals to another World Series win three years later in 1967, when they beat the Boston Red Sox. He also amassed 3,023 hits. Lou was a Hall of Fame player, a great coach, an insightful broadcaster and a wonderful mentor to countless generations of Cardinals players, coaches and members of the front office. They reached the game the following season, too, but fell to the Detroit Tigers.