first_imgJuan Martin del Potro and Nick Kyrgios took positive steps in their U.S. Open preparation by ousting seeded opponents to reach the second round of the Cincinnati Open on Tuesday.Former U.S. Open champion del Potro beat 10th-seeded Czech Tomas Berdych 3-6 7-6(1) 6-0, while Kyrgios opened with a 6-2 6-3 dismissal of ninth seed David Goffin of Belgium in the Cincinnati heat.Earlier in the day, sixth-seeded Canadian Milos Raonic announced his withdrawal from the tournament due to a lingering left wrist injury.The talented non-seeded winners, who have both battled injuries this season, excelled on serve.Del Potro powered in 17 aces in overcoming Berdych after a listless opening set.last_img

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