2019 US Open Day 1: Roger Federer, Madison Keys escape first round after early scares - Yahoo Sports
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Roger Federer reveals the strange serving technique he used to overcome US Open struggle | Tennis | Sport | Express.co.uk
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US Open 2019: Roger Federer and Serena Williams secure second round spots with victories on Monday | The Independent | The Independent
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Practice for Roger Federer before US Open - August 2019 - State Arthur-Ashe - NY | Jugadores de tenis, Tenista, Tenis
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