Tokyo - Garbine Muguruza advanced to the second round of the Pan Pacific Open on Monday, beating Belinda Bencic 6-2, 6-4.
Muguruza is seeded No 6 in the Tokyo tournament.
Also, Daria Gavrilova defeated Kristyna Pliskova 7-6 (7/2), 3-6, 7-6 (10/8), and Anett Kontaveit beat Kristina Mladenovic 6-3, 7-6 (7/5).
Caroline Wozniacki is the top-seeded player, and Caroline Garcia is No 2. Both had byes in the first round and did not play on Monday.
Third seeded Naomi Osaka, who won the US Open just over a week ago, also had a bye in the first round.