Ketlen Souza will open UFC Vegas 118 on Saturday against Ariane Carnelossi in a women’s strawweight rematch at the Meta APEX in Las Vegas. The pairing sends two UFC veterans back into the cage with the card’s first fight carrying the kind of history that tends to make an early bout feel bigger than its spot on the lineup.

Souza enters as the betting favorite at -300, while Carnelossi is listed at +240. For readers following ketlen souza now, the appeal is simple: this is not just another opening bout. It is a rematch six years in the making, and it arrives with both women trying to move past a 3-3 run in the UFC that has kept each from separating herself in the strawweight division.

Souza came into the UFC in 2023 after winning a title in Invicta FC, and she has since split six fights down the middle. Her UFC wins have come against Marnic Mann, Yazmin Jauregui and Bruna Brasil, while her defeats have come against Karine Silva, Angela Hill and Piera Rodriguez. Carnelossi’s path has been just as even. Signed in 2019, she has also gone three wins and three losses in the promotion, with victories over Liang Na, Istela Nunes and Piera Rodriguez and losses to Angela Hill, Loopy Godinez and Talita Alencar.

The rematch carries a sharp edge because the first meeting ended with Carnelossi scoring a late stoppage over Souza six years ago. That history is part of why some forecasts lean the other way from the betting board. One prediction calls for Carnelossi to win by decision, arguing that her aggression and higher strike output can carry her through the rematch. She is also coming off a submission loss in her last bout, which adds another layer to a fight where the odds and the forecast do not fully match.

So Saturday’s opener is less a warmup than a read on where both women stand after years of near-even results. Souza has the market behind her, but Carnelossi has already shown she can solve this matchup once. Their second meeting should tell which version matters more now.