American Taylor Fritz suffered a surprise first-round defeat against Germany’s Daniel Altmaier at the French Open on Monday.

Fritz has struggled on clay courts this year, but hoped to build on last year's runner-up finish at the U.S. Open.

The No. 4 seed in the men's draw is out of the French Open. Taylor Fritz, the top-seeded American man, went down in four sets in a stunning first round loss to Daniel Altmaier of Germany (7-5, 3-6. 6-3. 6-1).