In Henderson was again the team's primary center fielder, playing 134 complete games, and appearing in a total of 152 games during the season. His hitting wasn't as good as the prior year, as he batted .250 (down from .304) and had 131 strikeouts (up from 92). He had 15 home runs and 80 RBIs. The Athletics had a 99–63 record to win the AL West again, finishing 7 games ahead of the Kansas City Royals. In the 1989 ALCS the Athletics beat the Toronto Blue Jays in five games. Henderson hit 5-for-19 (.263) with one home run and one RBI during the ALCS.