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WATCH: Roger Federer Makes Slight Change in His Service Motion To Put Less Strain on His Back - EssentiallySports
If I turn my back to my opponent during serving motion, like Roger Federer, what technical advantage does that give me? - Quora
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11.Roger-Federer-Serve-in-Super-Slow-Motion-BNP-Paribas-2013 - Free Tennis Lessons from Essential Tennis
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