Last year’s runner-up Dominic Thiem reached the French Open quarter-finals with an impressive straight-set victory over home favourite Gael Monfils.

Thiem, 25, saw off the 14th-seeded Frenchman 6-4 6-4 6-2 in one hour and 48 minutes on Court Philippe Chatrier.

The Austrian will play 10th seed Karen Khachanov of Russia in the last eight.

Khachanov, 23, won 7-5 6-3 3-6 6-3 against Argentina’s eighth seed Juan Martin del Potro on Court Suzanne Lenglen.

It is the first time Thiem has won in straight sets at Roland Garros this year.

“It was my best match of the tournament so far, some great rallies, it’s always fun to play Gael,” he added.

Thiem produced a superb between-the-legs winner in the final set that brought applause from his opponent.

“There was no other choice to play that ball. When a ball like this goes in it is a hot shot!” said the fourth seed.

Khachanov took the opening two sets against Del Potro and lost the third but broke the Argentine’s serve at the start of the fourth set to move into the last eight of a Grand Slam for the first time.

“It’s the best result, for me to be in my first quarter-final in a Grand Slam,” said Khachanov.

“The atmosphere was really good and I really have good energy here.”

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