
Keystone
Stan Wawrinka suffers his fifth defeat in a row.
The Vaud native, who is ranked 155th in the ATP rankings, lost 6:3, 5:7, 3:6 to the Swede Elias Ymer (ATP 255) in the first round of the Challenger tournament in Sassuolo, Italy.
In addition to his first-round exit at the French Open, Wawrinka has also suffered three opening defeats on the second-tier Challenger Tour (Bordeaux, Perugia, Sassuolo) since mid-May.