Roger Federer stirred up a frenzy in Switzerland when he attended the Zurich Film Festival on Thursday. He was on hand for the premiere of Borg vs. McEnroe. The 19-time Grand Slam champion was an appropriate guest for many reasons, including having just won the Laver Cup for Bjorn Borg's Team Europe over John McEnroe's Team World.

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The Swiss star was asked a fun question while at the event, giving an equally fun answer.

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Borg vs. McEnroe is the second tennis film to be released this month after Battle of the Sexes.

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Federer will next play in Shanghai, which starts October 8.