Leroy Fer provided Swansea with a 2 - 1 lead , but Costa struck a bicycle kick inside a frantic final 10 minutes .
Diego Costa gave Antonio Conte 's side the lead , before Gylfi Sigurdsson levelled from the penalty spot .
Leroy Fer provided Swansea with a 2 - 1 lead , but Diego Costa struck a bicycle kick inside a frantic final 10 minutes .
Diego Costa gave Antonio Conte 's side the lead , before Gylfi Sigurdsson levelled from the penalty spot .