Karl Malone had the most points per game by a player in the playoffs in his 19th playoff, with 11.5 per game.

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who has the highest points per game in their 19th playoff
MaloneStockton11.511.2
NAMEGPPPGMPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Karl MaloneKarl Malone2111.538.08.83.41.10.12.24.710.445.00.00.00.02.23.563.0798242185722424765+10
John StocktonJohn Stockton511.229.83.25.21.60.22.83.67.846.20.00.20.04.04.0100.0149561626811413-42