Roger Federer will play tennis in Seattle for the first time and he’ll have a unique partner with him on the court: Bill Gates.

The tennis legend and 18-time Grand Slam champion will come to town on April 29 for a charity event supporting his foundation. He’ll play an exhibition match against American star John Isner at Key Arena and will also team up with Gates to play a one-set doubles match against Isner and a surprise celebrity partner.

The event marks the fourth “Match for Africa” day for the Roger Federer Foundation, which has given $29 million to support children’s education in six African countries and Federer’s home country of Switzerland. 

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