Dominic Thiem's bad luck continued as the former world number three confirmed he has tested positive for COVID-19.

Thiem only made his return to action on Tuesday, having not featured on the ATP Tour since June last year.

The Austrian underwent surgery on a wrist injury that kept him out of Wimbledon and also prevented him from defending his US Open title, while he also missed this year's Australian Open.

Having opted to push back his comeback further by skipping Indian Wells and the Miami Open, Thiem instead decided to play at the Challenger Tour's Andalucia Open.

His return was short-lived, as Thiem went down 6-3 6-4 to Pedro Cachin.

And Thiem will now face another spell out, after revealing he has contracted coronavirus.

"Looks like lately the good news don't last long... last night after dinner, I started feeling unwell and didn't have a good night," Thiem wrote on his official Instagram account.

"After developing mild symptoms I decided to take a test this morning, which came back positive for COVID-19.

"Now I have to wait and see how it develops. I'll keep you posted. Thank you all in advance for your support!"

Former US Open champion Dominic Thiem made his long-awaited return from a wrist injury on Tuesday, but lost 3-6 4-6 to Pedro Cachin at an ATP Challenger event in Marbella.

Thiem, the former world number three who hasn't played since 2021, started slowly and fell 5-0 behind in the first set against the world number 228.

He improved in the second set but was not able to recover from dropping serve in the first game.

"Obviously, the result today is the bitter part," Thiem posted on his Instagram. "I would have wanted to win, and I have to accept the defeat in a humble manner.

"This is only the beginning of a long way to the top of my game."

The next generation of tennis players are not close to knocking world number one Novak Djokovic off his mantle, according to three-time grand slam winner Andy Murray.

Djokovic’s big-match experience shined through while cruising to a straight-sets win over Russia’s Daniil Medvedev to seal his ninth Australian Open win and 18th career grand slam title.

The Serbian has lifted six of the last 10 slams, with 20-time slam-winner Rafael Nadal claiming three and Dominic Thiem capturing his first major honour at the 2020 US Open.

The draw opened up for the Austrian in Flushing Meadows when Djokovic was eliminated after defaulting in the fourth round when hitting a line judge with a stray ball.

Thiem is the only first-time winner of a major in the past 24 events over a six-year period, and Murray cannot see a changing of the guard anytime soon.

"The younger guys, for me, they've not shown that they're particularly close," Murray said.

"I expected the [Australian Open] final to be closer but it's a different standing to return or to serve in a grand slam final than a quarter-final or a semi.

"When you're coming up against someone who's won 17 of them, it's pretty intimidating.

"Obviously at the US Open, Dominic Thiem did what he had to do to win the event. But if Novak hadn't put a ball through the line judge's throat, it would have been the same outcome, I think."

Preparing for his first tour event of the season, an ATP 250 tournament in Montpellier, France, Murray has kept his distance from the grand-slam scene while rehabbing a long-term hip injury.

The 33-year-old admits he didn't even watch any of the action from Melbourne Park as he aims to rebuild his fitness and return to the highest level.

"I didn't watch any because I wanted to be there myself. It was a struggle to be honest," Murray added.

"I stopped following all the tennis players on social media and stuff because I just didn't really want to see it."

Murray goes up against world number 83 Egor Gerasimov of Belarus in the round of 32 on Tuesday, after finishing as runner-up to Ukraine's Illya Marchenko in an ATP Challenger event last week.

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