UFC middleweight champion Anderson Silva has failed to finish his opponent in only two UFC fights. At UFC 112 he spent five rounds toying with Demain Maia, while taunting him with terms like "playboy" (it's a long story).
The other was at UFC 97 in 2009, which also went the full five rounds.
In an interview with Benjamin Back of the Brazilian newspaper O Lance (The Lance), Silva was asked if he had ever held off finishing an opponent to keep a PPV going longer.
“There’s no such thing as holding back" replied Silva. "I want to finish as soon as possible. The only time I did it was because he was a friend of mine. It was against Thales Leites. We went until the last round because he’s a friend of mine and I respect him."
Curiously, in an Brazlian Portuguese language interview with Leites by Tatame today, he denied that they are friends...Full Story