Coca-Cola International Premier Tennis League - Singapore: Day One [Getty Images]

SINGAPORE - DECEMBER 02: Nick Kyrgios and Serena Williams of the Singapore Slammers discuss tactics against Daniel Nester and Kirsten Flipkens of the Manila Mavericks during the Coca-Cola International Premier Tennis League at the Singapore Sports Hub on December 2, 2014 in Singapore, (Photo by Clive Brunskill/Getty Images for IPTL 2014)

Getty Images Sport Clive Brunskill