The single postseason batting average leader is Lloyd McClendon with 16 plate appearances, he batted .727 in the 1992 postseason.
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Rod Carew's best batting average for a season was .388 in 1977 playing for the Minnesota Twins. His career batting average was .328.
Mariano Rivera has the best career postseason ERA wit 0.74 in 133.1 innings pitched.
Dusty Baker had the best career batting average against Tom Seaver with .426.
Career wise, that would be Tony Gwynn (1982-2001) with a .338 career average. As of the start of the 2008 season, Gwynn ranks 20th all time in MLB career batting average. For a single season, that would be George Brett (1973-1993) with a .390 average in the 1980 season.
Bob Gibson