By Miguel Rivera

As previously reported on BoxingScene.com, Anthony Joshua said on Wednesday there is no one to blame but himself for the shock loss of his IBF, IBO, WBA, WBO heavyweight titles to Andy Ruiz Jr last Saturday.

The 29-year-old British pugilist went down to one of the biggest upsets in the history of the heavyweight division at Madison Square Garden with Ruiz sensationally stopping Joshua, who captured Olympic gold in the 2012 games.

The 29-year-old Ruiz started the fight as a massive 32-1 underdog but floored Joshua four times on his way to a win which upended the heavyweight division.

Joshua, whose camp activated a rematch clause on Tuesday, moved on Wednesday to dispel rumours something had been wrong with him as many pundits had wondered about his listless performance.

Joshua, whose promoter Eddie Hearn initially said he felt his fighter would never recover from the defeat to his Mexican-American opponent, said unlike others he was not searching for excuses as to why he under-performed.

Julio Cesar Chavez Sr. - who many view as the greatest Mexican fighter of all-time, is very proud by what Ruiz has accomplished.

What Ruiz was able to pull off has been embraced by the entire country of Mexico.

"It was something historic for us Mexicans, we feel very proud. I personally did not think he was going to win, but when I saw that he held his own in the first round and then the second and then had him hurt, I said 'there is a chance' and the truth is this is very exciting. He's chubby, chubby but what a chin he has," Chavez Sr. said to ESPN.