Harris was expected to face Aleksei Oleinik on May 4, 2019, at UFC Fight Night 151. However, on April 3, 2019, it was announced that Oleinik would face Alistair Overeem at UFC on ESPN+ 7 after Alexander Volkov pulled from the event. He was replaced by Sergey Spivak. Harris won the fight via TKO in the first round.

