MASON, Ohio (AP) — Australian Open semifinalist Hyeon Chung won the last five games to rally past Jack Sock 2-6, 6-1, 6-2 on Tuesday in the first round of the Western & Southern Open.
Two-time Cincinnati semifinalist Milos Raonic advanced with a 6-3, 6-3 first-round win over qualifier Dusan Lajovic in this U.S. Open tuneup. Robin Haase also made it to the second round, defeating Filip Krajinovic 4-6, 6-2, 6-3.
On the women's side, 15th-seeded Elise Mertens scored a 6-4, 6-2 win over Magdalena Rybarikova. Ashleigh Barty, seeded 16th, stopped wild-card Marketa Vondrousova 6-3, 7-5.
Maria Sakkari upset Indian Wells champion Naomi Osaka 6-3, 7-6 (8). Ekaterina Makarova cruised past qualifier Ana Bogdan 6-3, 6-2.