Melbourne, Jan. 25 -- Serbian legend and 24-time Grand Slam champion Novak Djokovic gets a walkover into the ongoing Australian Open quarterfinals after Jakub Mensik pulls out with an abdominal muscle injury.

Mensik, who had beaten Djokovic in the Miami Open final last year, cited the injury's progression over recent matches as the reason for withdrawal. Djokovic now faces either fifth seed Lorenzo Musetti or ninth seed Taylor Fritz in the quarterfinals.

"After doing everything we could to keep going, I have to withdraw from the Australian Open due to an abdominal muscle injury that has progressed over the last matches," Mensik said. "Even though I'm disappointed, making the fourth round here for the first time is something I will carry...