WATCH: In other news from retired players, James Blake will play a USTA Pro Circuit $15,000 event next week.

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Who's Roger Federer's pick to be the next first-time Grand Slam champion? How has he stayed active since retiring from tennis? Who tells the best dad jokes on tour? And how about the time someone mistook him for his biggest rival?

The all-time great answered those questions and more this week in the latest rousing round of #AskRF, Federer's Twitter Q&A series.

Don't have the time to scroll through Federer's entire feed to find out what you missed? Don't worry; we did that for you.

Here are some of the best highlights of this episode of #AskRF.

On what he misses most about life on tour:

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On what he likes most about retirement:

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On reliving his glory days:

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On the best serve his ever faced (with one silly and one sweet reference thrown in, for good measure):

On dad jokes:

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On lessons learned in his tennis career:

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On the next generation of ATP stars:

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On his worst case of mistaken identity:

(Speaking of Rafael Nadal, the Swiss gave him his best wishes as he continues to recover from injury.)

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Nadal was, in fact, a popular topic, and Federer, who retired with a losing career record vs. the Spaniard, had some fun at his own expense about that fact.

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While most of the questions were submitted by fans, that didn't stop one or two famous faces from chiming in.