OKLAHOMA CITY -- Thunder forward Serge Ibaka, who was thought to be sidelined for the Western Conference finals because of a calf injury, is in the starting lineup for Game 3 against San Antonio.

Ibaka has been nursing a left calf strain for the last 10 days. He participated in shootaround Sunday and declared himself able to play barring a setback. The Spurs lead the best-of-seven series 2-0.

"I'm trying to put my mind ready and if I'm going to feel better later, I'm going to go," Ibaka said earlier Sunday. "For now, we're going to see if I feel better, because normally when you do this kind of workout, sometimes you can have pain later.

"So I'm going to see how I feel later and then I'm going to decide."

Ibaka, who was initially expected to miss the remainder of the postseason because of the injury, which occurred against the Los Angeles Clippers on May 15, had his status unexpectedly upgraded to day to day on Friday.

"It is my decision. At this point, it is my decision more than Coach [Scott Brooks] or the doctor. So it is my decision," Ibaka said. "And like I said, I went through some offense and defense this morning with my teammates. I'm going to put some ice [on the calf] and see how I'm going to feel later."