UPDATE 4-Tennis-Djokovic and Wawrinka reach Rome final

(adds Djokovic quotes, reason for Stepanek's retirement)

By Paul Virgo

ROME, May 10 (Reuters) - Australian Open champion Novak Djokovic and unseeded Swiss Stanislas Wawrinka will meet in the final of the Rome Masters on Sunday after their semi-final opponents retired injured on Saturday.

Serbian third seed Djokovic went through after unseeded Czech Radek Stepanek, who stunned world number one Roger Federer on Friday, pulled out when 6-0 1-0 down. After the game Stepanek said he felt weak and dizzy on court.

Wawrinka made the final after American sixth seed Andy Roddick withdrew at 3-0 down in the first set because of a back injury.

Stepanek looked out of sorts from the off. The charges to the net that had proved effective against Federer did nothing to unsettle the 20-year-old Serb.

The Czech player was also guilty of too many unforced errors, screaming in frustration after hitting the first of two double faults to lose his serve in the final game of the first set.

He took a long pause before the start of the second set to consider his fitness and decided to stop after losing the following game to love.