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Danielle Collins Pictures
HONOLULU, HI - DECEMBER 28: Danielle Collins of the United States and Christian Harrison of the United States (near court) shake hands with Yanina Wickmayer of Belgium and Sam Querrey of the Unites States after a mixed-doubles exhibition match at the Hawaii Tennis Open at the Stan Sheriff Center on December 28, 2019 in Honolulu, Hawaii. (Photo by Darryl Oumi/Getty Images)