David Nalbandian defeated the two-time defending champion Roger Federer in the final, 6âÂÂ7<sup>(4âÂÂ7)</sup>, 6âÂÂ7<sup>(11âÂÂ13)</sup>, 6âÂÂ2, 6âÂÂ1, 7âÂÂ6<sup>(7âÂÂ3)</sup> to win the singles tennis title at the 2005 Tennis Masters Cup.
Mariano Puerta's round-robin result was disqualified upon his doping charge in December 2005.
<small>Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.</small>
<small>Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-players-ties, head-to-head records; 4. in three-players-ties, percentage of sets won, or of games won; 5. steering-committee decision.</small>