John Isner serves during his men's singles match against Spain's David Ferrer in the 2016 Australian Open tennis tournament in Melbourne on Jan. 25, 2016.
John Isner serves during his men's singles match against Spain's David Ferrer in the 2016 Australian Open tennis tournament in Melbourne on Jan. 25, 2016. GREG WOOD AFP/Getty Images
John Isner serves during his men's singles match against Spain's David Ferrer in the 2016 Australian Open tennis tournament in Melbourne on Jan. 25, 2016. GREG WOOD AFP/Getty Images