Either by fighters, trainers, fans etc. The one that comes to mind right now is when Hatton said Mayweather Sr. wasn't training him well after the Pacquaio fight. Throughout the whole fight (yes both rounds), u cud see Hatton threw out the gameplan given to him, then goes on to blame Mayweather Sr for not giving him a good plan. Any others come to mind?
"I was 108 degrees last night & should be dead" or something like that (Maybe it was Jack Loew later on)
Roy jones afte the the third fight with Tarver saying he lost cause if he had won his father would be the one getting all the credit.
Jones after Tarver III - 'I lost on purpose because my dad would've gotten all the credit.' Pacquiao after Morales I - 'I didn't have my Clito-Ris gloves.' Pacquiao after Marquez I (Draw) - 'I didn't have the right socks'.