NEW YORK (AP) -- Ask Rafael Nadal how his famously troublesome left knee is feeling on the eve of the U.S. Open, and he balks a bit while formulating a response.
"I am ..." the 12-time major champion begins during an interview with The Associated Press.
"You know ..." he resumes, before smiling sheepishly and pausing again.
Eventually, Nadal offers something of a complicated answer, saying that he figures he needs to say he's doing well because of how well he's been playing. He takes a 10-match winning streak into Monday against American Ryan Harrison as the year's last Grand Slam tournament begins at Flushing Meadows.
The second-seeded Nadal says it "will sound strange" if he says he still has problems with his knee. But he adds he still has "pain some days."