OKLAHOMA CITY — The Stephen Curry mystery has taken a strange turn.

Until now, the mystery has been how that skinny little guy with the baby face can dominate the league and lead his team to one improbable victory after another. This is the guy who inspired the phrase “Steph Time,” for that magical moment when he goes into video-game mode and takes over a game.

Now the mystery is: What happened to that guy?

After leading the team to a regular-season-record 73 wins, Curry on Tuesday led the Warriors to a playoff loss for the second game in a row.

Curry wasn’t the only Warrior off his mark, but he is the two-time league MVP and the league’s No. 1 Miracle Man.

Tuesday he shot 6-for-20, including 2-for-10 from behind the arc. He had five assists and six turnovers. The league’s top free throw shooter missed two of those. His defense was wanting.

In the previous game, Curry shot 7-for-17 and 3-for-11 on threes.

What’s up? Is the Thunder defense just too much for the Warriors and the league’s leading scorer?

Could Curry’s recent spate of injuries be plaguing him? In the playoffs he has suffered a sprained ankle, a sprained knee and a contusion on his shooting arm from a dive into the stands.

Asked after Tuesday’s game about injuries, Curry said, “No, I’m fine.”

At this point in the season, no sane player would blame injuries for a poor performance. The knee almost surely isn’t close to being 100 percent, but he’s had some remarkable games since coming back from that injury.

“He’s not injured,” coach Steve Kerr said after the game. “He’s coming back from the knee, but he’s not injured. He just had a lousy night. It happens, even to the best players in the world.”

But Curry has led us to believe he’s better than the best players in the world.

On two or three occasions Tuesday night, a Curry three would have deflated the wild crowd and put the Warriors back in the game. But they missed the mark.

He said that his shot selection was fine, but that he “had a terrible start to the game, and shots that I normally make (when I) got to the paint, (I) missed some layups. It wasn’t my night (from the) start.”

Asked if his assignment of guarding the unguardable Russell Westbrook affected his offense, Curry said, “No. I’ve just got to play better. ... This is a tough situation to be in, but the series isn’t over. In our locker room it’s obviously frustration, trying to figure out how we can get back to being ourselves. ... So, excited about that.”

Curry didn’t sound excited, and he said his injuries aren’t bothering him, so we just have to take him at his word on both those counts.

But something is wrong.

Scott Ostler is a San Francisco Chronicle columnist. Email: sostler@sfchronicle.com Twitter: scottostler