Russell Westbrook has the most games with 10+ assists, 20+ points and 10+ rebounds in a season, with 37 games in 2016-17.

most career games with 20 or more pts, 10 or more asts and 10 or more rebounds by a palyer in a season
Interpreted as:
most career games by a player with 20 or more pts, 10 or more asts and 10 or more rebounds by a palyer in a season

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