Stan Wawrinka has advanced to the Australian Open quarterfinals with a five-set victory over fourth-seeded Daniil Medvedev.
The 2014 Australian Open champion dominated the fourth-set tiebreaker and then broke Medvedev in the opening game of the deciding set. He won 6-2, 2-6, 4-6, 7-6 (2), 6-2.
Medvedev's only other loss so far in 2020 was to Novak Djokovic in the ATP Cup. Wawrinka will play either Alexander Zverev or Andrey Rublev in the quarterfinals.
Medvedev was given an unsportsmanlike conduct warning in the final set when he became upset with the umpire when he wasn't allowed to challenge a call.
It was his 300th tour-level win on hard courts.