He was stopped by technical knockout by Bernard Hopkins, but never actually knocked out.

Ricky Hatton has lost twice in professional competition, once by Knockout, and once by Technical Knockout

The TKO was Floyd Mayweather Jr. (December 8, 2007)

The KO was Manny Pacquiano (May 2, 2009)

The duration of Bangkok Knockout is 1.75 hours.

TKO, technical knockout, is when the fight is stopped because if they continue there is a very high likely hood that the loser is giong to get hurt even worse then they already have. It is an acknowledgement that the loser no longer has the ability to effectively protect themself and it is only a matter of time before the winner knocks them out. KO, knockout, means that the winner has actually caused the loser to be unconscious and out cold.

The knockout pins hit the transfer plate, actuating the knockout cylinders.