john isner
![](https://a.espncdn.com/photo/2017/0117/r172086_600x400_3-2.jpg?w=660&r=16%3A9)
No. 19 seed John Isner among American men to fall in Round 2
John Isner, the highest-seeded U.S. player in the men's draw at No. 19, lost in five sets to Mischa Zverev at the Australian Open -- one of several American men to stumble Wednesday in Round 2.