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Photo Gallery: Eyes on the Ball • Halep, Federer, Osaka, Nadal and More

Simona Halep is riveted on the ball at Roland Garros.
Novak Djokovic focuses on the flick en route to the Western & Southern Open title.
Teenager Lorenzo Musetti eyes the ball during his upset of Kei Nishikori in Rome.
Kirsten Flipkens shows sharp vision setting up for her classic slice.
Roger Federer’s iconic forehand is predicated on his pure focus.
Yulia Putintseva studies the incoming ball during the Rome quarterfinals.
Rafael Nadal locks his eyes on the prize in the Roland Garros semifinals.
Rafael Nadal’s piercing vision helped him power to his 13th Roland Garros championship.
Grigor Dimitrov gives us indoor optics in Rotterdam.
Maria Sharapova maintains ball connection in one of her final matches down under.
Denis Shapovalov shows all-court vision in the Rome semifinals.
US Open champion Naomi Osaka gives us visor vision.