Jake Shields may walk away from the sport of mixed martial arts if he loses tonight (Aug. 16).

Shields is coming off a stunning second-round TKO loss to Ray Cooper III at PFL 3 last month. Shields never got going and was dominated all the way to the TKO finish. It’s the first time Shields was finished since Aug. 2015. He’s now gone 1-3 in his last four outings.

Shields will do battle with Herman Terrado at PFL 6 inside the Ocean Resort Casino in Atlantic City, New Jersey. Shields told Sherdog.com that a loss in that fight could lead to the end of his MMA career:

“If I don’t win this. I might decide to call it [a career]. … It would definitely be nice to go out there and win, get into the tournament and end my career a little better. I never wanted to be a guy fighting and losing fights I shouldn’t. It would be a good achievement (winning the PFL tournament). At my age, to come back and win, that would be pretty impressive.”

PFL 6 will be headlined by a welterweight clash between Ray Cooper III and Pavel Kusch. Magomed Magomedkerimov vs. Bojan Velickovic will also be featured as the co-main event. Kayla Harrison will compete in her second pro MMA bout against Jozette Cotton.