Daniil Medvedev extended his winning streak to 18 matches today as he beat American Mackenzie McDonald 6-4 6-2 6-3 fourth-round Open clash.

In superb form, the Russian moved ominously into the quarterfinals – the second Russian in as many days after qualifier Aslan Karatsev won yesterday.

Daniil Medvedev pushed past American Mackenzie McDonald in under 90 minutes. Photo: Tennis Australia/ MORGAN HANCOCK

McDonald tried everything to unsettle Medvedev, rallying from the back and rushing the net but the No. 4 seed remained calm to win the match in just under 90 minutes.

Up next, a last-eight meeting with either Andrey Rublev or Norway’s Casper Ruud.

“It was a great match. I was feeling the ball great, I was serving great,” Medvedev said.

“The only time I lost serve was 5-2 in the first set, which didn’t matter so much,” said the 2019 US Open runner-up and 2020 ATP Finals champion.

“So I’m really happy. It’s an exciting moment to be in the quarters in Australia for the first time.

“But I always want more. It’s step by step.”

Daniil Medvedev could face Andrey Rublev in the quarterfinals. Photo: Tennis Australia/ MORGAN HANCOCK

Of his next opponent Medvedev was backing compatriot Rublev.

“Of course I’m going to be for Andrey because if he goes through, it’s going to be at least one Russian in the semis, maybe two,” he added.