Spain's Rafael Nadal sits at the end of the VTR Open final tennis game against Argentina's Horacio Zeballos in Vina del Mar, Chile, Sunday, Feb. 10, 2013. Nadal lost to Zeballos 6-7 (2), 7-6 (6), 6-4 in Sunday's final of the VTR Open, the Spaniard's comeback tournament after seven months out with a torn tendon in his left knee. (AP Photo/Luis Hidalgo)

Associated Press
Spain's Rafael Nadal sits at the end of the VTR Open final tennis game against Argentina's Horacio Zeballos in Vina del Mar, Chile, Sunday, Feb. 10, 2013. Nadal lost to Zeballos 6-7 (2), 7-6 (6), 6-4 in Sunday's final of the VTR Open, the Spaniard's comeback tournament after seven months out with a torn tendon in his left knee. (AP Photo/Luis Hidalgo)
Spain's Rafael Nadal sits at the end of the VTR Open final tennis game against Argentina's Horacio Zeballos in Vina del Mar, Chile, Sunday, Feb. 10, 2013. Nadal lost to Zeballos 6-7 (2), 7-6 (6), 6-4 in Sunday's final of the VTR Open, the Spaniard's comeback tournament after seven months out with a torn tendon in his left knee. (AP Photo/Luis Hidalgo)