Roger Federer pranked by Jack Sock during Match For Africa Unknown 01:40 Even though Sock lost, he did manage to slightly embarrass the GOAT. Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsChiefs star Patrick Mahomes addresses Kareem Hunt signing with BrownsChampions League: Revenge not on Ilkay Gundogan's mind as he returns to Schalke with Manchester CityTodd Gurley's knee injury was worse than Rams first thought, C.J. Anderson saysFormula One: 'Mother of all messes' Brexit could harm Britain-based teams and help Ferrari, says Mercedes' Toto WolffEuropean football talking points: Marcelo's nightmare season, Borussia Dortmund's perilous slide in Bundesliga and moreKentucky forward Reid Travis sprains right knee in win over Missouri