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Australian Open day one: Coco Gauff defeats Venus Williams, Federer, Serena, Osaka all win

(CNN)New year, new grand slam, same result.Teenager Coco Gauff defeated seven-time grand slam champion Venus Williams 7-6 6-3 in the first round of the Australian Open on Monday, a rematch of the 15-year-old's grand slam debut at Wimbledon last year. Competing in the main draw for the first time in Melbourne, Gauff raced into an early lead in the opening set but failed to capitalize on her advantage. Williams, 24 years her opponent's senior and playing in her 85th major, pulled back at the end of the set before going down 7-5 in a tense tie break. READ: After ending her losing streak in finals, is Serena Williams on course to win the Australian Open?Gauff again took an early lead in the second set and this time made it count, wrapping up t ...