John Isner survives a scare in Houston and Steve Johnson advances in US Men's Clay Court Championship! Read more:

HOUSTON (AP) -- Second-seeded John Isner advanced to the U.S. Men's Clay Court Championship quarterfinals Thursday, beating Argentina's Leonardo Mayer 6-7 (5), 7-6 (3), 6-3.Isner set up a match against fellow American Ernesto Escobedo, a 4-6, 6-4, 6-4 winn