Not necessary, but I think their use shows a bit more sophistication in the use of the language.
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AnonymousIf he plays well which [is what] he's been doing lately, they have a shot at winning.You need a comma after which.
Aspara Gus AnonymousIf he plays well which [is what] he's been doing lately, they have a shot at winning.You need a comma after which.Before(?)