Coco Gauff remains on semi-final collision course with defending champion Aryna Sabalenka but she dropped her first set of the year at the Australian Open overnight. The world No.1 Sabalenka also refused to back a tennis legend's criticism of scheduling of women's matches.

The Irvine native and 19-year-old qualifier, who played one semester at USC, wins a 4-hour, 49-minute thriller that ends at nearly 3 a.m. in Melbourne

Teenage qualifier Learner Tien stunned last year's Australian Open runner-up Daniil Medvedev after Jannik Sinner roared back to take his place in the third round.