Dominic Thiem sets up Alexander Zverev clash with win over Kei Nishikori

Thiem progressed as a 6-2 6-0 5-7 6-4 winner over 19th seed Nishikori, who battled gamely to recover despite a wrist injury appearing to haunt him.

After two hours and 27 minutes, Thiem finally scrambled over the line despite appearing to tighten up on Philippe-Chatrier.

Thiem enjoyed nine aces and 41 winners on his way to reaching the quarter-finals for a third straight year.

Zverev was a 4-6 7-6(4) 2-6 6-3 6-3 winner over unseeded Karen Khachanov moments earlier.

Thiem, the last man to beat claycourt machine Rafael Nadal on his favourite surface, displayed an impressive arsenal of weapons in the first two sets before regaining his composure after the loss of the third.

Nishikori, on the comeback trail after he ended his 2017 season in mid-year because of injury, seemed to lose interest in the match in the second set but eventually managed to put up a decent fight.

"The first two sets were amazing but then he raised his level and it was 50-50. In the end it was very close and I was a bit nervous in the end as it is always hard to serve to reach the quarter-finals of the French Open," said Thiem, a semi-finalist here in 2016 and 2017.

"I love these conditions; it was the first time for me on Court Philippe Chatrier not playing against Rafa so I could enjoy the court", he joked.

Thiem had too much power and speed for Japan's Nishikori who was overwhelmed in the opening set, which the Austrian bagged with an ace in under half an hour.

It got even worse for Nishikori in the second set as Thiem toyed with him, notably with a stunning drop-shot service return, and the Japanese could manage only nine points in the set.

In the first two sets, the Austrian won 25 of 25 points on his first serve.

In the third set, however, Nishikori stayed in touch as he served better and finished off points at the net, which unsettled Thiem who grew frustrated.

Nishikori seized his first break opportunity at 6-5 to take the set when Thiem's forehand flew long.

The Austrian, who ended 10-times French Open champion Nadal's streak of 50 consecutive sets won on clay in Madrid, broke decisively for 4-3 in the fourth set with a trademark forehand winner.

He then held serve throughout to wrap it up on his second match point when Nishikori sent a forehand long under the eyes of Nadal