1st Serve return points won % - On ATP career Leaderboard, Nadal is #3, Alcaraz #4, Djokovic #6 and Federer #26.
2nd serve return points won % - Nadal #4, Djokovic #6, Alcaraz #24, Federer #113.
Total Return leaderboard - Nadal #3, Djokovic #7, Alcaraz #29, Federer #100
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Statistical measures of the best-performing players in three key categories in men's professional tennis.
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Yes, it includes clay which is one of the most popular surfaces in the world to play tennis and there is zero reason to exclude it. Federer could chip lower bouncing first serves better with his 1HBH and use the pace to return them deep. On higher bouncing, slower kick serves where he had to generate his own pace, he didn’t do as well. Similar to how he was a master on fast and low bouncing surfaces while slow, high bouncing clay was his worst surface. Considering how much of the tour is played on hard courts, it is a fantastic metric for Nadal to be ranked so high and above Djokovic who often gets lauded as the best returner.