Martina Hingis Pictures
SINGAPORE - OCTOBER 29: Martina Hingis (L) of Switzerland poses with (2nd L-R) Micky Lawler, WTA President, Chan Yung-Jan of Chinese Taipei and WTA Legend Ambassadors Iva Majoli and Mary Pierce (R) during her retirement ceremony during day 8 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 29, 2017 in Singapore. (Photo by Matthew Stockman/Getty Images)