Juan Martin del Potro was dumped out of the French Open by Karen Khachanov in the fourth round. The Argentine No 8 seed lost the first two sets 7-5 6-3 before rallying with a 6-3 win in the third. However, his Russian opponent, who is seeded No 10, clinched the final set with a 6-2 win and will now face Dominic Thiem, who put on a masterclass to see off Gael Monfils earlier in the day. The 23-year-old, who produced 57 winners throughout the contest, sealed the win with an ace to reach his first Grand Slam quarter-final. "Yes, I would say it my best match and the best result for me – my first quarter-final of a Grand Slam. So thank you guys for supporting me," he told Eurosport. "I have really good energy here, there's a really good atmosphere here. People like me, so thank you again. I would say you were supporting Juan Martin a bit more but that's OK. "Thanks to my team for all their work and for always being by my side. Let's go for more."