British welterweight prospect John O'Donnell beat the most experienced opponent of his six-year pro career by outpointing 1996 Olympic bronze medalist Terrance Cauthen over 12 rounds in a Showtime-televised main event from York Hall in Bethnal Green, London, on Friday.

O'Donnell (24-1, 11 knockouts), a tall and rangy 24-year-old southpaw, was the busier man and the aggressor throughout the ShoBox headliner, which earned him a 118-112 scorecard from referee Ken Curtis, the bout's sole official.

Cauthen (35-7, 9 KOs) was game but the 34-year-old veteran southpaw from New Jersey simply lacked the speed, reflexes and power to compete with his 10 years-younger opponent. Cauthen is now 3-4 in his last seven bouts, all of which were against young up-and-comers. It's safe to say the former Olympian and pro prospect has fallen to journeyman status, although he's still a serviceable opponent.

The victory was O'Donnell's ninth straight since suffering a shocking second-round KO loss to journeyman Christian Solano in Las Vegas in May of 2007. The Ireland-born London resident is now scheduled to face former wold title challenger Michael Jennings in a British welterweight title bout in October.

In the co-featured bout of the ShoBox broadcast, 6-foot-9 heavyweight prospect Tyson Fury soundly outworked green-but-game late sub Rich Power over eight rounds to score an often sloppy unanimous decision.

Fury (12-0, 9 KOs), who won by the referee's shutout score of 80-72, beat Power by simply taking the fight to the smaller man. Power (12-1, 9 KOs), a late-comer to boxing from Michigan who splits time as an MMA fighter, took the fight on one week's notice when Fury's original opponent Donnell Holmes pulled out.

The 30-year-old San Diego resident, who had never fought past four rounds, didn't throw many punches and was clearly out of gas by the third round but he hung in there made Fury work for his victory.

Fury, of Manchester, appeared to score a fifth-round knockdown from a body shot but referee Jeff Hinds ruled it a slip. Hinds could have called at least two technical knockdowns when a totally exhausted Power flopped repeatedly against the ropes in the eighth round but the referee seemed to want to give Powers the benefit of the doubt.

Powers scored one solid blow in the fight — an uppercut that dislodged Fury's mouthpiece in the seventh round — but the affable giant took the shot without blinking and continued to pummel the tough American.

“Power was a bit more awkward than I expected,” Fury said afterward. “He was slipping and sliding all over the place but I handled him well enough to win each round.”

Power, pride intact, said he was simply outsized by Fury.

“When I weighed in at 221, I knew I was in trouble,” said Power, who was outweighed by 40-plus pounds. “But I refused to give up and I think I proved to his crowd that I have heart and desire. I love to fight.”