UFC Middleweight Champion Chris Weidman and Vitor Belfort. However, after Belfort withdrew from the bout on 28 February 2014, it was announced that Machida would replace him in the main event UFC 173 on 24 May 2014. On 24 March 2014, it was revealed that Weidman would need to undergo knee surgery. The title fight with Weidman was rescheduled and eventually took place at UFC 175 on 5 July 2014. Machida lost the fight via unanimous decision. After Weidman had controlled much of the action throughout the first three rounds with his wrestling and relentless pressure, Machida began to find his range on his strikes in the fourth. Machida landed a number of hard strikes in the round including a left hook which stunned Weidman at the very end of the round. Machida would continue to find success striking early in the fifth as well. However, Weidman would land several hard shots of his own later in the round before seemingly clinching the round with a takedown and controlling Machida from top position for over a minute, although Machida managed to stand up and attack with a flurry of strikes in the closing seconds of the fight. Despite losing on the scorecards, Machida earned his third Fight of the Night bonus award for his performance. Machida next faced C. B. Dollaway on 20 December 2014 at UFC Fight Night 58. Machida won the fight via TKO only 62 seconds into the first round after landing a body kick that dropped Dollaway, finishing him with a barrage of punches that forced the referee to stop the fight. Machida also earned a Performance of the Night bonus award. Machida faced Luke Rockhold on 18 April 2015, at UFC on Fox 15. He lost the fight via submission in the second round after being dominated on the ground by Rockhold throughout the whole of the fight. Machida faced Yoel Romero on 27 June 2015, at UFC Fight Night 70. After a fairly competitive first two rounds, Machida lost the fight via knockout in the third round. A rematch with Dan Henderson was expected to take place on 16 April 2016, at UFC on Fox 19. However, on 13 April, the UFC announced that Machida declared the usage of a banned substance – 7-Keto-DHEA – during an out-of-competition sample collection the week prior. Machida stated that he was unaware that the substance was prohibited