MELBOURNE, Australia (AP) -- Third-seeded Simona Halep continued her strong start to the year with a 6-3, 6-2 first-round win over Karin Knapp of Italy at the Australian Open on Monday.

On Tuesday, fifth-seeded Victoria Azarenka retired with a knee injury while trailing 6-3, 6-7 (6), 4-0 against Karin Knapp. No. 1 seed Serena Williams, however, had little trouble dispatching ...