Russia's Daniil Medvedev beat compatriot Andrey Rublev to reach the semi-finals at the Australian Open for the first time.
The fourth seed overcame Rublev 7-5 6-3 6-2 as his eighth-ranked opponent struggled in the 29C temperatures at Melbourne Park.
Medvedev, 25, has won all 11 of his matches against top 10 players since the US Open in September 2020.
He will play either Rafael Nadal or Stefanos Tsitsipas next.
ATP Finals champion Medvedev, whose best performance at a Grand Slam was finishing as runner-up at the 2019 US Open, goes into the semi-finals on a 19-match unbeaten streak.