Danish tennis player Caroline Wozniacki returns a ball to Serena Williams from the US during their Champions Battle exhibition game in benefit of the development of Danish sports on November 26, 2015 in Herning, Denmark. Wozniacki won the match 6-3 6-4. AFP PHOTO / SCANPIX DENMARK / CLAUS FISKER +++ DENMARK OUT +++ / AFP / SCANPIX DENMARK / CLAUS FISKER        (Photo credit should read CLAUS FISKER/AFP via Getty Images)