Serena Williams of the US hits a return against Poland's Agnieszka Radwanska during their women's singles semi-final match on day eleven of the 2016 Australian Open tennis tournament in Melbourne on January 28, 2016. AFP PHOTO / PAUL CROCK-- IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE / AFP / PAUL CROCK (Photo credit should read PAUL CROCK/AFP/Getty Images)
