Serbian Filip Krajinovic stunned blitzed Dominic Thiem 6-2, 6-1 in New York on Monday, losing just two service points on his way to the third round of the Western & Southern Open.

Thiem, one of the leading contenders, struggled to find any form all match against his unseeded opponent.

“It was just a horrible game by myself. Didn’t play well at all,” Thiem said.

“I Didn’t get any rhythm. I felt like I didn’t win any points on his serve.

“I had a lot of trouble with returning. It’s tough to understand right now, but, I will think about it and hopefully I’ll find better answers in the next days.”

Krajinovic through was pleased with his good start.

“I was aggressive and I’m really happy that I’m in the third round,” he said.

“I don’t think Thiem was playing today good tennis, but I took the chance and I think I deserved to win.”

He won 32 of 34 service points, and broke the World No. 3 four times.

Krajinovic will play Hungarian qualifier Marton Fucsovics next. Fucsovics beat 14th seed Grigor Dimitrov 7-5, 4-6, 6-2.