The world's No. 1 player falls in four sets after hurting his back.
The world's No. 1 player will play Stanislas Wawrinka in final, is closing fast on some of the sport's Grand Slam records.
The vaunted rivalry is renewed once again, and the winner takes on Stanislas Wawrinka in the final.
Nadal battles through blister on his hand to set up glittering semifinal.