The Phillies won 12 out of the final 14 games of the season to win the National League Eastern Division title. Díaz contributed by hitting .360 in the final week of the season, including a game on September 28 against the Chicago Cubs in which he had 5 hits in 5 at-bats including 2 home runs. Although he led National League catchers in errors, he led the league in range factor and finished second in putouts, assists and in baserunners caught stealing. After defeating the Los Angeles Dodgers in the 1983 National League Championship Series, the Phillies lost the 1983 World Series against the Baltimore Orioles in five games. In the only World Series appearance of his career, Díaz was the leading hitter for the Phillies with a .333 batting average. During Game One of the Series (the only game of the Series that the Phillies won, by a 2-1 score), Díaz almost hit a home-run, but he was robbed of it by John Lowenstein with a spectacular, beyond the wall catch.