Russell Westbrook had the most games in the playoffs with 10+ rebounds, 50+ points and 10+ assists, with 1 game.

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most games in playoffs with 50 points 10 rebounds and 10 assists by a player
Interpreted as:
most games in playoffs with 50 or more points 10 or more rebounds and 10 or more assists by a player
Russell WestbrookRussell Westbrook151101341.451.
StatMuse has game-level data for assists going back to the 1965 playoffs.