US Open runner-up Zverev had raised doubts as to whether he should have played his last-16 match at a coronavirus-affected tournament when he complained of feeling “completely sick”.
Zverev later returned a negative test for Covid-19. He said he had been suffering from a cold after telling reporters he had a temperature of 38 degrees Celsius (100.4 Fahrenheit).
The German top seed needed just over an hour in Cologne to see off Verdasco, who was disqualified from the French Open after failing a coronavirus test.
Zverev, 23, will meet South Africa’s Lloyd Harris for a semi-final spot as he attempts to win a first tour title since last year’s Geneva Open.
In times of uncertainty you need journalism you can
trust. For only R75 per month, you have access to
a world of in-depth analyses, investigative journalism,
top opinions and a range of features. Journalism
strengthens democracy. Invest in the future today.
Send your news and stories to us firstname.lastname@example.org or email@example.com and WhatsApp: +447747873668.
Before you go...
Democratic norms are being stress-tested all over the world, and the past few years have thrown up all kinds of questions we didn't know needed clarifying – how long is too long for a parliamentary prorogation? How far should politicians be allowed to intervene in court cases? To monitor these issues as closely as we have in the past we need your support, so please consider donating to The Climax News Room.