Late goals from Eden Hazard and Nemanja Matric helped Chelsea beat Premier League title rivals Tottenham Hotspur 4-2 in a gripping FA Cup semi-final at Wembley on Saturday.
Willian, who was included in the side for or Hazard, gave Chelsea the lead with a fine free-kick after five minutes of the start of play before Harry Kane levelled for Spurs with an instinctive stooping header in the 18th minute.
Willian put Antonio Conte's side back in front from the penalty spot just before half time as Son Heung-min penalised for a foul on Victor Moses.
Spurs seemed to have the momentum after Dele Alli converted Christian Eriksen's brilliant pass in the 52nd minute Conte called on Hazard and Costa from the bench,with the Belgium international's low strike putting Chelsea ahead once more inside the final 15 minutes, reports goal.com.
Hazard drove powerfully past Spurs keeper Hugo Lloris after 75 minutes and Nemanja Matic finally put the nail in the coffin in the 80th minute to set up an appearance alongside Arsenal or Manchester City in the FA Cup final.