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ROTTERDAM, NETHERLANDS - FEBRUARY 16: Stan Wawrinka of Switzerland serves to Kei Nishikori of Japan in their semi final match during Day 6 of the ABN AMRO World Tennis Tournament at Rotterdam Ahoy on February 16, 2019 in Rotterdam, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images)

ROTTERDAM, NETHERLANDS - FEBRUARY 16: Stan Wawrinka of Switzerland serves to Kei Nishikori of Japan in their semi final match during Day 6 of the ABN AMRO World Tennis Tournament at Rotterdam Ahoy on February 16, 2019 in Rotterdam, Netherlands. (Photo by Dean Mouhtaropoulos/Getty Images)
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