The Canadians will next take on Italy, who surprised the United States in the other quarterfinal tie of the day.

Not until the match was more than four hours old did the No. 5 seed take the lead, at 4-all in the fifth, before closing out the German Monday.

Jannik Sinner may have the trickiest opener of them all, taking on three-time Grand Slam champion Stan Wawrinka.

World No. 2 Medvedev just lost to his first-round opponent in Halle two weeks ago.

Aslan Karatsev's recent run, and those of others, shows it's never too late to break out.

South African qualifier Lloyd Harris secured the biggest win of his career, upsetting world No. 4 Dominic Thiem, 6-3, 6-4, in the second round of the Dubai Duty Free Tennis Championships.

After losing to Novak Djokovic in three sets, Alexander Zverev regrouped with Jan-Lennard Struff to edge Djokovic and Nikola Cacic on Friday, clinching Germany's place in the semifinals.

Once again, world No. 74 Pospisil has provided a seeded player with a terrible first-round draw.

Government restrictions have been lifted in the two countries, allowing events to be held with local players if safety protocols are followed.