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.


Australia's Khawaja confirmed for Sydney Ashes test
Kyrgios beats Sabalenka in 'Battle of the Sexes' showdown
Ronaldo honours Djokovic at the 16th Globe Soccer Awards
Mahrez sends Algeria into Africa Cup of Nations last-16
H.H. Sheikh Mohammed inaugurates 10th Al Salam Cycling Championship
