Savannah Marshall described Claressa Shields’ win over Ema Kozin as ‘a bore-fest’ as she continues to goad her rival.
Marshall and Shields are expected to arrange an undisputed middleweight clash down the line this year, assuming Marshall retains her WBO strap against Femke Hermans on March 12. Shields holds the WBA, WBC and IBF titles.
The two fighters confronted one another after Shields cruised to an uneventful win over Kozin last Saturday in Cardiff.
"You can't come over, burn everyone's skull out all week calling yourself the greatest, slander me in interviews and on Twitter and then when it comes to it give me a fist-pump after performing like that," Marshall told Sky Sports .
"Somebody had to tell her, she really underperformed. You can't call yourself the greatest and then go 10 rounds with somebody who is fresh out the womb.
"Taking nothing away from Ema, she's a tough girl and I'm sure in time she'll mature and she'll come back stronger. But from rounds seven to 10 Ema didn't throw a punch and the best thing about it is she stood in front of Claressa and she subjected all them people in Cardiff to 10 rounds of a bore-fest.
"It's the last thing you want after you retained your titles, somebody saying you're an embarrassment so I definitely spoilt her night."
Marshall inflicted Shields’ only defeat in boxing when they met as amateurs in the 2012 AIBA Women's World Boxing Championships in Qinhuangdao.
"It was a decade ago, we've never fought since, we're both completely different fighters so I think it's all the ingredients for an even better rematch," Marshall claimed.
"She's game, I'm game. I genuinely believe it's the biggest fight in female boxing, I know some other people at the moment will disagree but I genuinely believe it is the biggest fight.
"At the heavier weights the pool's very shallow and obviously Claressa is a great boxer, a great athlete, a three-time undisputed champion, different weights, but I'm just that confident I beat her. The only reason she's got the titles is because she beat me to it."