ATLANTA, GA - JULY 25: Alex De Minaur of Australia returns a backhand to John Isner during the BB&T Atlanta Open at Atlantic Station on July 25, 2018 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)
ATLANTA, GA - JULY 25: Alex De Minaur of Australia returns a backhand to John Isner during the BB&T Atlanta Open at Atlantic Station on July 25, 2018 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)