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'What's going on': Dominic Thiem's 'concerning' downfall stuns tennis world

Dominic Thiem (pictured) looking worried during a tennis match.
Dominic Thiem (pictured) was knocked out of the Lyon Open in stunning fashion only days before Roland Garros. (Getty Images)

Tennis fans are beginning to wonder what is going on with World No.4 Dominic Thiem after he suffered yet another defeat in a 'worrying' moment ahead of Roland Garros.

Thiem, normally one of the favourites heading into the French Open, was knocked out of the Lyon Open after Britain's No.2 Cameron Norrie continued his best season ever to defeat the Austrian 6-3, 6-2.

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The British number two is enjoying the best season of his career, reaching the final of the ATP tournament in Estoril and consistently beating players ranked above his mark of 49.

"I'm so pleased to win today. It's my biggest win of my career. I couldn't be happier to get the win today and to get another match on the clay before Roland Garros," Norrie said in his on-court interview.

However, Thiem has been struggling with confidence and form after his two-month lay-off from the Dubai Open.

"It was a huge disappointment just now. Just also a big, I would stay, step backwards after promising tournaments in Madrid and Rome. I don't really know why," Thiem said after the loss.

"I was preparing well here ... I was hoping to take the little positive signs from Madrid and Rome here, but it didn't work out. I have to analyse (it) now and look (towards) Roland Garros."

Fans worry over Thiem's struggles

Thiem will head into Roland Garros with a 4-3 record since his return.

The Austrian took to social media to express his disappointment on the early Lyon exit.

But fans were also taken aback with is continued struggles and pointed out it was 'concerning' only days out from Roland Garros.

Norrie will face another surprise winner in French lucky loser Arthur Rinderknech, who stunned Italian sixth seed Jannick Sinner 6-7 (9-7), 6-2, 7-5.

with AAP

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