PONTE VEDRA BEACH, Fla. — What’s wrong with Brooks Koepka?

Outside of “Where is Tiger Woods, and when will we see him again?’’ this is the most pressing question entering the Players Championship, which begins with Thursday’s opening round.

Koepka, who dominated the golf world for 2018 and 2019, winning four major championships and gaining a stranglehold on the No. 1 world ranking, has struggled so much this year that he made an emergency visit to renowned swing coach Butch Harmon on Sunday and Monday before arriving to TPC Sawgrass.

Butch Harmon, who’s based in Las Vegas, is the father of Koepka’s regular coach, Claude Harmon.

“I had Claude’s blessing,’’ Koepka said Wednesday. “I called Claude, I told Pete, and they were all behind it. Claude’s always going to be my coach. Pete [Cowan] is always going to be my short-game coach. I made a phone call to Claude, and it’s one of those things I felt like I just I had so much going on in my head, so many swing thoughts and needed to clear the slate. The Harmons are family to me, and so we flew out Sunday, went and saw Butch [on] Monday, and got in [Tuesday] afternoon.

“Butch has seen me swing it a million times. I just needed a different set of eyes, maybe something might click, because I was failing. Claude was telling me the same things he’s said for five years — the three keys that we have just worked on — and for some reason, I just couldn’t do it.

“That’s on me. It’s not on Claude. It’s not Claude’s fault, it’s not Pete’s fault, it’s not anybody’s fault except my own, and the fact [is] that I couldn’t do it. I just needed a fresh set of eyes just to look at it and see if he saw anything out of the ordinary.

“The beauty of it is Butch has seen it so many times, so it was good for me to go out there.’’

Koepka has played five PGA Tour events this year and has played poorly in all of them, most recently finishing tied for 47th at the Arnold Palmer Invitational last week, shooting a career-worst 81 on Saturday. The week before he missed the cut at the Honda Classic, which is minutes from his home.

He said the work with Butch Harmon was “pretty fundamental stuff,’’ adding, “I just wasn’t doing it, to put it very bluntly. You fall into bad habits, and sometimes you just got to work your way out of them.

“Butch saw it in four swings, I think, and told me a couple things,’’ Koepka said. “I had planned on being out there [in Vegas] all day Tuesday, and he told me to fly [back to Florida] and get out here and practice, because he felt like everything was on the right track. Now, it’s our job to make sure that it progresses and it progresses nicely with Claude.’’

Koepka revealed he had a meeting with his “team’’ for nearly 90 minutes on Tuesday.

“Just trying to go over everything and make sure everybody’s on the same page and knows what we’re at, what we’re trying to accomplish,’’ he said. “A lot of that is on my shoulders. I haven’t done maybe the best job of doing everything I need to do.’’

Koepka had surgery on the patella in his left knee late last summer, but he insisted Wednesday the knee is not the reason for his struggles.

“My knee’s fine,’’ he said. “My knee’s exactly where it should be. It’s just a matter of execution, taking care of what I need to take care of. It has nothing to do with my knee. That’s me, whether it’s lack of concentration, focus, decisiveness, whatever it might be, that’s all on my shoulders, it has nothing to do with anybody else.’’

What must be affecting him adversely is the lack of tournament reps as a result of the knee surgery.

“I think it had a little bit to do with something,’’ he said. “I think it’s only been 22 rounds since August. That’s six months that’s not really a lot of golf. That’s why I played last week, just to get some rounds, and it’s great to be hitting it on the range, but you need to understand when you’re trying to hit a shot under pressure what it does. The unfortunate thing is probably halfway through the season, and I’m still trying to figure it out.’’