ATP roundup: J.J. Wolf reaches quarterfinals in Washington

(Photo credit: Geoff Burke-USA TODAY Sports)
In a battle of Americans, 16th seed J.J. Wolf held off Michael Mmoh 6-4, 7-6 (5) on Thursday to reach the quarterfinals of the Mubadala Citi DC Open in Washington.

Wolf converted only three of 22 break-point opportunities as Mmoh battled him. Mmoh recorded more aces (16-10) and each player committed six double faults and made 16 unforced errors.

Also in the round of 16, fifth