Terence Holt, 40, was found in the Claremont pub with injuries from which he later died in hospital. Police released no further details.
Witnesses said Mr Holt was stabbed when he tried to intervene in a row between rival supporters of boxers Chris Eubank and Nigel Benn who watched their fight on television in the pub.
A Greater Manchester police spokesman said: 'We are investigating an apparent link between the murder and the boxing match on TV.'
Detectives tonight detained a man for questioning in connection with Mr Holt's death.