'Tayla Harris is tough': Female footy star scores brutal boxing KO

AFLW Star Tayla Harris produced a decisive second-round onslaught and showed more ruthlessness to extend her unbeaten professional boxing record to six fights on Wednesday.

Harris scored a second round TKO over professional debutante and media personality Renee Gartner on the undercard of the Tim Tszyu-Dwight Ritchie fight in Sydney.

It was her first KO as she improved her record to 5-0-1 (1 KO).

After a quiet opening round in which there was little action apart from a couple of right hand shots by Harris, the dual sports star opened up in the second.

Garner did land one punch but got caught herself and Harris followed up with a barrage of blows, prompting the stoppage from referee Les Fear.

"When someone is affected by a punch, exhausted you've got to act on it and I recognised an opportunity," Harris said.

"Renee turned her back around and kept going. Previously I might have noticed a turn and thought 'I'll let her straighten up', but I learnt that boxing isn't about that.

"If you give them a chance they will take it, so iIdidn't let her have a chance."

It was Harris's first fight since the end of the AFLW season and the iconic picture of her athleticism which led to some people trolling her online.

A number of Harris's Carlton teammates flew to Sydney to watch the fight .

The only blemish on her record is a draw for the Australian middleweight title last year and she would jump at the chance to win the national crown.

"I'd love that to be there. I'm sure it will be there and I'll take it as soon as it comes up, whenever it is," she said.

Tszyu tames Ritchie for welterweight title

Tszyu looks set for a ratings rise after carving out a unanimous points decision over Ritchie in their super welterweight bout.

Tszyu (14-0, 10 KOs) won by margins of four, five and six points in a very competitive fight on Wednesday to win two regional super welterweight titles.

He landed the heavier blows and looked good when putting the pressure on, forcing the Victorian back.

But Ritchie (19-2, 2 KOs), who was rated ninth by the IBF, three places above Tszyu, got off plenty of his own shots, sometimes beating his opponent to the punch.

Ritchie was cut near his left eye in the third round, but allowed to continue by veteran fight doctor Lou Lewis.

Tszyu went on the offensive for the rest of the round with Ritchie, obviously conscious of the cut, occasionally pawing at his eye.

Tszyu found the range more often with his right hand as the fight progressed, tagging Ritchie several times in the last.

"He kept me on my toes, he took me somewhere I haven't been," Tszyu said of Ritchie.

"I just proved that 'I'm the best (super welterweight) in Australia, I've cleaned up my division

'It's time to think about going overseas."