The meeting lasted 1 hour 53 minutes and ended with a score of 7: 5, 3: 6, 2: 6.

In the quarterfinals, Mertens and Sobolenko will play either with Romanian Monica Niculescu and Japanese Misaki Doi, or with a Thai duet - Chan Latisha / Chan Khaochin.

Earlier, Roger Federer beat Marton Fuchovich in the fourth round of the Australian Open.