Warriors guard Stephen Curry, in his first extended interview since spraining his right knee Sunday in Houston - and learning a day later he would be sidelined for at least two weeks - said he's "optimistic" and hopes to return sooner than May 9, the designated date his status will be re-evaluated. Curry started riding the stationary bike a bit Thursday and has spent time in the weight room trying to maintain his strength. Replays of the injury, on the final play of the first half of Game 4 against the Rockets, cleared up Curry's confusion about the wet spot on which he slipped. Ron Kroichick is a San Francisco Chronicle staff writer.