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Diego Schwartzman

Diego Schwartzman of Argentina tries to teach the ballgestures after a winning point as he plays against Alexander Zverev of Germany during their tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Diego Schwartzman of Argentina plays a return to Alexander Zverev of Germany during their tennis match at the ATP World Finals tennis tournament at the O2 arena in London.

Photo by AP/PTI

Argentina's Diego Schwartzman plays a shot against Spain's Rafael Nadal in the semifinal match of the French Open tennis tournament at the Roland Garros stadium in Paris, France.

Photo by AP/PTI

Serbia's Novak Djokovi? serves the ball to Argentina's Diego Sebastián Schwartzman during their final match at the Italian Open tennis tournament, in Rome.

Alfredo Falcone/LaPresse via AP

Argentina's Diego Sebastián Schwartzman reacts during his match with Serbia's Novak ?jokovi? during their final match at the Italian Open tennis tournament, in Rome.

Alfredo Falcone/LaPresse via AP

Serbia's Novak Djokovi?, right, celebrates winning his match with Argentina's Diego Sebastián Schwartzman, left, during their final match at the Italian Open tennis tournament, in Rome.

Alfredo Falcone/LaPresse via AP

Argentina's Diego Sebastián Schwartzman poses with his second place trophy after loosing to Serbia's Novak Djokovi? during his final match at the Italian Open tennis tournament, in Rome.

Alfredo Falcone/LaPresse via AP

Rafael Nadal overcame a spirited effort from Diego Schwartzman 6-4, 7-5, 6-2 to move within two wins of his 19th Grand Slam title.

AP