World number one Iga Swiatek battled back from two breaks down in the final set to beat Danielle Collins 6-4 3-6 6-4 on Thursday and reach the third round of the Australian Open for the fifth successive year.
Collins might be ranked 62nd in the world but has a good record at Melbourne Park and beat Swiatek in the semi-finals two years ago before going on to lose to Ash Barty in the title-decider.
Four-times Grand Slam champion Swiatek has an excellent record against lower-ranked players but really had to dig deep into her reserves to overcome Collins in a scrappy three-hour contest on Rod Laver Arena.
The 30-year-old Collins faltered in her serve at key moments in the match and Swiatek found her best tennis late in the decisive set to move onto a third-round clash with Czech Linda Noskova.


India's Iyer taken to hospital after fielding injury
Norris unfazed by crowd boos after winning in Mexico
Mbappe and Bellingham strike as Real Madrid edge Barcelona 2-1 in fiery El Clasico
Brazilian teen Fonseca beats Fokina to win biggest career title in Basel
Arsenal go clear after win over Palace, Man City slip up at Villa
