Djokovic retires against Krajinovic (Belgrade, QF)
Apparently, Djokovic wasn't feeling so good and wasn't sure he wanted to play Belgrade, but given that it's his home tournament, he felt obligated. The least likely Serbian to win today was therefore, Filip Krajikovic, 18 years old, reaching the semifinals. Good news for Americans. John Isner beat Richard Gasquet in 3 sets earlier. His