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.
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