Katie Taylor's world lightweight title bid is still on after opponent Anahi Sanchez failed to make weight and vacated the WBA belt.
The champion from Argentina was a pound overweight at the initial weigh-in for the Cardiff fight and then missed the weight again at a second attempt.
The two teams agreed that the fight would go ahead but only Ireland's Taylor can secure the title.
If Taylor is beaten by Sanchez then the belt will be vacant.
Former Olympic champion Taylor has won all six of her professional contests.
Taylor, 31, will take on Sanchez on the undercard of Anthony Joshua's heavyweight title defence against Carlos Takam at the Principality Stadium.
Sanchez is an experienced fighter with a record of 17 wins and two defeats from 19 bouts.
"This is the biggest night of my career. I'm so excited about it," said Taylor before Friday's weigh-in.
"These are the sort of fights that are going to elevate women's boxing. It's definitely a big step up.
"I've had a great 10-11 week training camp in America. These are the sort of challenges I relish and I can't wait for it."