Maxvill appeared in five World Series - three (1964, 1967 and 1968) with the Cardinals and two (1972 and 1974) with the Athletics. In the 1964 Series, which the Cardinals took from the New York Yankees in seven games, Maxvill caught Bobby Richardson's pop-up for the final out in the seventh game. In the 1968 Series, which the Cardinals lost to the Detroit Tigers in seven games, Maxvill went a record 0-for-22 at the plate. His overall World Series batting record was 7-for-61, a .115 percentage. Both of those figures are record Series lows for a position player. However, Maxvill was impeccable defensively in the postseason, handling 88 chances in four World Series and 14 chances in two league championship series without a miscue.