he also became the youngest pitcher ever to start a major league baseball all-star game when, at age 20, he went to mound for the american league in the second all-star contest of . walker went three innings and allowed one run on two hits and one base on balls, and was credited with the win in a 5–3 al victory at los angeles memorial coliseum. later that season, on september 11, 1959, he hurled a 16-inning, complete game shutout against the eventual league champion chicago white sox, winning 1–0. it was his 11th and final win of the 1959 season, his most successful campaign in the big leagues.