TENNIS PHOTOS

  • Dominic Thiem of Austria returns a ball to Pablo Carreno Busta of Spain during their quarterfinal match at the Swiss Open tennis tournament in Gstaad, Switzerland, Friday, July 31, 2015. (Peter Schneider/Keystone via AP)

    View Photo »

  • Dominic Thiem of Austria returns a ball to Pablo Carreno Busta of Spain during their quarterfinal match at the Swiss Open tennis tournament in Gstaad, Switzerland, Friday, July 31, 2015. (Peter Schneider/Keystone via AP)

    View Photo »

  • Feliciano Lopez of Spain returns a ball to Santiago Giraldo of Columbia during their quarterfinal match at the Swiss Open tennis tournament in Gstaad, Switzerland, Friday, July 31, 2015. (Peter Schneider/Keystone via AP)

    View Photo »

  • Feliciano Lopez of Spain returns a ball to Santiago Giraldo of Columbia during their quarterfinal match at the Swiss Open tennis tournament in Gstaad, Switzerland, Friday, July 31, 2015. (Peter Schneider/Keystone via AP)

    View Photo »

  • ATLANTA, GA - JULY 30: Radek Stepanek of the Czech Republic is aced by John Isner during the BB&T Atlanta Open at Atlantic Station on July 30, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

    View Photo »

  • ATLANTA, GA - JULY 30: John Isner returns a forehand to Radek Stepanek of the Czech Republic during the BB&T Atlanta Open at Atlantic Station on July 30, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

    View Photo »

  • ATLANTA, GA - JULY 30: Radek Stepanek of the Czech Republic returns a forehand to John Isner during the BB&T Atlanta Open at Atlantic Station on July 30, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

    View Photo »

  • ATLANTA, GA - JULY 30: Radek Stepanek of the Czech Republic returns a forehand to John Isner during the BB&T Atlanta Open at Atlantic Station on July 30, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

    View Photo »

  • ATLANTA, GA - JULY 30: Radek Stepanek of the Czech Republic returns a forehand to John Isner during the BB&T Atlanta Open at Atlantic Station on July 30, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

    View Photo »

  • ATLANTA, GA - JULY 30: John Isner reacts after winning a game against Radek Stepanek of the Czech Republic during the BB&T Atlanta Open at Atlantic Station on July 30, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

    View Photo »