Maccarinelli's third professional knock-out leaves his boxing career hanging in the balance after being beaten by an explosive shot in the ninth round.

BBC: Warren's warning to Maccarinelli

They took me to the doctors and found a crack in one of my vertebrae -- I was out of boxing for a year.

CNN: STORY HIGHLIGHTS

This is what primarily rules out contact sports like football, boxing and wrestling from head-to-head competition between the sexes.

WSJ: Can Female Athletes Compete Against Men? In Shooting, Yes

Boxing, tennis, track and field, soccer and horse-racing are being squeezed out.

ECONOMIST: Americans at play

Her husband suggested she try out as a boxing expert, seeing that would make her an unusual contestant -- a woman versed in pugilism.

CNN: TV pioneer, famed psychologist Joyce Brothers dies

He visits a Russian farm to look at the country's ambitions to be an agricultural superpower, checks out the Star City astronaut training center, meets with seven-foot boxing world champion-turned-movie star Nikolai Valuev and talks along the way with entrepreneurs and environmentalists working to make the city of Sochi home to green Olympics in 2014.

CNN: Eye on Russia: Opportunity and Influence

DeGale, who fights out of the Dale Youth Boxing Club in London, extended his lead to 6-3 after three rounds and opened up in some style in the final round.

BBC: DeGale eases into quarter-finals

Sheffield boxing promoter Dennis Hobson has also tried to tempt Calzaghe out of retirement with a clash against light-heavyweight fighter Clinton Woods.

BBC: Froch challenges Calzaghe again