Paolo Lorenzi Pictures
BEIJING, CHINA - OCTOBER 05: Paolo Lorenzi of Italy and Mischa Zverev of Germany check hands during their Men's doubles quarterfinal match against Juan Martin del Potro and Leonardo Mayer of Argentina on day six of the 2017 China Open at the China National Tennis Centre on October 5, 2017 in Beijing, China. (Photo by Etienne Oliveau/Getty Images)