As a 29-year-old rookie, Doyle was an effective member of the 1969 Braves' bullpen, working in 36 games and 39 innings pitched, winning each of his two decisions, posting four saves, compiling a strong 2.08 earned run average, and helping his team win the National League West Division championship. Doyle appeared in Game 2 of the 1969 NLCS against the New York Mets; in one inning, he allowed two unearned runs on two hits. The Mets took the contest, 11–6, and proceeded to sweep the best-of-three series en route to their first world championship.