Warwick batted right-handed but threw left-handed; he stood tall and weighed. Born in Dallas, Texas, he graduated from Sunset High School and then played varsity baseball for Texas Christian University, leaving after his junior season to sign a bonus contract with the Dodgers. In his second pro season, 1959 with the Victoria Rosebuds, he led the Double-ATexas League in runs scored and home runs, hit.331 and was selected Most Valuable Player. The following year, playing with the Triple-A St. Paul Saints, he was named an American Association all-star. Warwick made the Dodgers' 28-man early-season roster coming out of spring training in, but was traded to the Cardinals May 30 with shortstopBob Lillis for third basemanDaryl Spencer. Struggling at the plate, he spent 52 games tuning up his batting stroke with the Triple-A Charleston Marlins. He then spent the next four full seasons at the major league level. In, in another early-season trade, the Cardinals dealt him to the expansion Colt.45s on May 7. Back in his native Texas, Warwick became Houston's regular center fielder, starting in 104 games, and his 16 home runs ranked second on the club. The Colt.45s moved Warwick to right field in, and he got into a career-high 150 games, but his power numbers declined. Just prior to spring training in, the Cardinals reacquired Warwick to serve as a spare outfielder and pinch hitter. He appeared in 88 games, and had 11 hits in 43 at bats in a pinch hitting role, as St. Louis put on a late-season surge to win the National League pennant on the closing day of the season.
Then, in the 1964 World Series, Warwick was called on to pinch hit five times by managerJohnny Keane. He reached base four times in his first four appearances. His sixth-inning pinch single in Game 1 off Al Downing drove home the go-ahead run in the Cardinals' 9–5 triumph. He also singled and scored a run in Game 2 against Mel Stottlemyre, drew a base on balls from Jim Bouton in Game 3 and singled again off Downing in Game 4, to spark a rally capped by Ken Boyer's grand slam home run in a 4–3 Cardinal win. He fouled out off Bouton in Game 6 to complete a Series in which he batted.750 with an.800 on-base percentage, two runs scored and an RBI. The 1964 World Series was the high-water mark of Warwick's baseball career. He batted only.132 in a season split between the Cardinals and Orioles, and then.227 in 16 games for the last-place Cubs. His contract was purchased by the Orioles from the Cardinals on July 24, 1965. He appeared in nine games but was hitless in fourteen at bats. He made it on base only on three walks but scored each time. He was traded from the Orioles to the Cubs for Vic Roznovsky on March 31, 1966. He retired from baseball prior to the 1967 season, returning to Houston and operating real estate and travel agencies. In the majors, Warwick collected 363 hits, including 51 doubles, ten triples, 31 home runs and 149 RBI.