Looks like Rafa has tendinitis in the knee and he's questionable for Davis Cup. From the AP:
Medical tests Tuesday confirmed the tendinitis, and Spain team doctor Angel Ruiz-Cotorro said the top-ranked player would undergo treatment through Saturday.
Nadal will have more tests Monday to assess the injury. Spain plays Argentina in the final on indoor hard court at Mar del Plata from Nov. 21-23.
Spanish Davis Cup captain Emilio Sanchez Vicario will not pick Nadal if he is unfit, Nadal's uncle and coach Toni said Tuesday.
That's some tough luck but it's not surprising. I hope this doesn't signal a trend of Rafa's body breaking down. That would suck Nando balls.