![John Isner reacts during his match against Alex Kuznetsov at the Citi Open tennis tournament on Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon Stock Photo - Alamy John Isner reacts during his match against Alex Kuznetsov at the Citi Open tennis tournament on Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon Stock Photo - Alamy](https://c8.alamy.com/comp/2N71M17/john-isner-reacts-during-his-match-against-alex-kuznetsov-at-the-citi-open-tennis-tournament-on-wednesday-july-31-2013-in-washington-isner-won-7-6-2-7-6-4-ap-photoalex-brandon-2N71M17.jpg)
John Isner reacts during his match against Alex Kuznetsov at the Citi Open tennis tournament on Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon Stock Photo - Alamy
![Tennis Server ATP/WTA Pro Tennis Showcase - 2006 U.S. Open - Flushing Meadows, New York - Tommy Haas / Alex Kuznetsov Tennis Server ATP/WTA Pro Tennis Showcase - 2006 U.S. Open - Flushing Meadows, New York - Tommy Haas / Alex Kuznetsov](http://www2.tennisserver.com/images/BobSchwartz/060830/Haas-Kuznetsov/060830_Haas-009.jpg)
Tennis Server ATP/WTA Pro Tennis Showcase - 2006 U.S. Open - Flushing Meadows, New York - Tommy Haas / Alex Kuznetsov
![Alex Kuznetsov looks on against Tommy Haas of Germany during the U.S.... Foto di attualità - Getty Images Alex Kuznetsov looks on against Tommy Haas of Germany during the U.S.... Foto di attualità - Getty Images](https://media.gettyimages.com/id/71753363/it/foto/alex-kuznetsov-looks-on-against-tommy-haas-of-germany-during-the-u-s-open-at-the-usta-billie.jpg?s=1024x1024&w=gi&k=20&c=MZePLCIglSBfhH2XCPsufs5kyDE3XFZlYFMo5SUZK3I=)
Alex Kuznetsov looks on against Tommy Haas of Germany during the U.S.... Foto di attualità - Getty Images
![Washington DC, USA. July 28, 2013 - Alex Kuznetsov (USA) volleys with Malek Jaziri (TUN) during qualifying rounds today at the Citi Open at the William H.G. Fitzgerald Tennis Stadium in Washington, Washington DC, USA. July 28, 2013 - Alex Kuznetsov (USA) volleys with Malek Jaziri (TUN) during qualifying rounds today at the Citi Open at the William H.G. Fitzgerald Tennis Stadium in Washington,](https://c8.alamy.com/comp/DBCDKH/washington-dc-usa-july-28-2013-alex-kuznetsov-usa-volleys-with-malek-DBCDKH.jpg)
Washington DC, USA. July 28, 2013 - Alex Kuznetsov (USA) volleys with Malek Jaziri (TUN) during qualifying rounds today at the Citi Open at the William H.G. Fitzgerald Tennis Stadium in Washington,
![John Isner returns the ball during his match against Alex Kuznetsov at the Citi Open tennis tournament on Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon Stock Photo - Alamy John Isner returns the ball during his match against Alex Kuznetsov at the Citi Open tennis tournament on Wednesday, July 31, 2013, in Washington. Isner won 7-6 (2), 7-6 (4). (AP Photo/Alex Brandon Stock Photo - Alamy](https://l450v.alamy.com/450v/2n71m1e/john-isner-returns-the-ball-during-his-match-against-alex-kuznetsov-at-the-citi-open-tennis-tournament-on-wednesday-july-31-2013-in-washington-isner-won-7-6-2-7-6-4-ap-photoalex-brandon-2n71m1e.jpg)