MASON, Ohio (AP) Juan Martin del Potro advanced to the second round of the Western & Southern Open with a 3-6, 7-6 (1), 6-0 upset of 10th-seeded Tomas Berdych on Tuesday.
The 30th-ranked del Potro shook off a first-set loss, jumping out to a 4-1 lead in the second set before settling for a win in the tiebreak, which he led 5-0 and clinched with an ace. He built on his momentum by rolling through the third set against the Wimbledon semifinalist, improving to 12-0 in first-round matches this season.
Berdych was playing his first match since withdrawing from last week's Rogers Cup in Montreal with a rib injury.
Ninth-seeded David Goffin became the first seeded man to be knocked out in Cincinnati, falling to Nick Kyrgios, 6-2, 6-3 in a first-round match. Kyrgios will meet qualifier Alexandr Dolgopolov in the second round after Dolgopolov defeated Kevin Anderson 6-4, 7-6 (6).
In women's first-round action, Karen Khachanov beat Diego Schwartzman 6-1, 1-6, 6-3, and Ashleigh Barty beat Varvara Lepchenko, 6-4, 6-4 in a matchup of two qualifiers.