WINSTON-SALEM, N.C. -- Borna Coric has advanced to the quarterfinals of the 2017 Winston-Salem Open after an upset win over Triad native John Isner.

Coric defeated Isner in straight sets (7-5, 6-2) Wednesday night at the Wake Forest Tennis Complex.

The loss ends Isner's run at a third career Winston-Salem Open title.

Coric will play Jan-Lennard Struff in the quarterfinals Thursday.