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By The Numbers: Rafael Nadal's 21 Grand Slam singles titles - Official Site of the 2022 US Open Tennis Championships - A USTA Event
Penn women's tennis wins three singles titles at Columbia Invitational | The Daily Pennsylvanian
EVERY Roger Federer Career Singles Title 🏆 - YouTube
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List of Grand Slam men's singles champions - Wikipedia
Wimbledon 2021 Men's Singles Winners List: Novak Djokovic won his 6th Wimbledon Gentlemen's Tennis Championship, 20th
