John Isner's tennis career end in a 5th-set tiebreak loss at US Open

NEW YORK (AP) - John Isner's career fittingly ended with a final-set tiebreaker.

Isner put a volley into the net to end the match and what he had announced would be his final singles tournament, falling in the U.S. Open second round to fellow American Michael Mmoh 3-6, 4-6, 7-6 (3), 6-4, 7-6 (7).

"It's tough. I like to think I work as hard as I can," Isner told a Grandstand crowd that erupted in ch