Walt Harris took care of his latest opponent like he had somewhere else to be.

“The Big Ticket” needed just 12 seconds to complete a crushing KO sequence of Aleksei Oleinik in the heavyweight co-main event of UFC on ESPN 4 on Saturday in San Antonio, Texas.

Known for his legendary submission game, Oleinik was given no time to initiate any offense as Harris immediately blasted him with a flying knee to the body. An off-balance Oleinik was caught by a follow-up straight left that caused him to collapse awkwardly to the canvas (upon replay, it looked as if Oleinik may have injured his right leg during the fall). A couple of punches followed, but the bout was clearly already over.

Harris’s 12-second finish marks the third-fastest knockout in UFC heavyweight history, behind Jairzinho Rozenstruik (:09) and Todd Duffee (:07).

“It feels amazing, I’ve been working my tail off for these moments,” Harris said post-fight. “I’m just happy, I don’t even know what to say right now. I’m happy.”

Harris (13-7, 1 NC) is now unbeaten in four straight contests, while Oleinik (57-13-1) has lost two straight and three of his last five.

As for what is next for Harris, he expressed interest an interest in being booked on the upcoming UFC 242 show in Abu Dhabi on Sept. 7, or UFC Vancouver on Sept. 14.