Ketlen Vieira vs. Macy Chiasson is a highly anticipated women’s bantamweight matchup set for May 31, 2025, at the UFC Apex in Las Vegas. Both fighters are 33 years old and bring veteran experience to the cage, but their styles and physical attributes set up an even clash.
Ketlen Vieira vs. Macy Chiasson – Odds
The upcoming UFC Fight Night matchup between Ketlen Vieira and Macy Chiasson is shaping up to be a closely contested bout, with betting odds reflecting a near-even split between the two fighters. Currently, most bookmakers have Ketlen Vieira as a very slight favorite, with odds around 1.78 to 1.91 for her to win Play Michigan, while Macy Chiasson’s odds are nearly identical, ranging from 1.79 to 1.92 depending on the sportsbook. This indicates that the betting market sees this as a highly competitive fight, with no clear-cut favorite.
Predictions from algorithm-based models give Macy Chiasson a marginal edge, assigning her a 54% chance of winning. Chiasson comes into the fight with an impressive record. Plus, a notable height and reach advantages (5’11” and 72 inches, respectively), and a balanced mix of knockout and submission victories. Vieira is known for her grappling and submission skills, but is slightly shorter and has a shorter reach.
As for the method of victory, the odds are so close that the market is not strongly favoring a particular outcome (decision, knockout, or submission) for either fighter. The over/under for rounds is commonly set at 2.5, which is typical for women’s bantamweight bouts, suggesting that bookmakers expect the fight could go the distance.
The UFC match odds have remained relatively stable in the days leading up to the fight, with only minor fluctuations reflecting small shifts in betting volume and sentiment. There have been no significant late moves indicating a strong surge of confidence in either fighter.
The key to this fight is whether Ketlen Vieira can impose her grappling and get Chiasson to the mat, or if Chiasson can keep the fight standing and use her reach to outstrike Vieira. Vieira’s takedown defense is excellent, but Chiasson’s striking output and recent finishing ability make her a dangerous opponent.
Expect a competitive, back-and-forth bout. If Vieira controls the grappling exchanges, she could grind out a decision. If Chiasson keeps it standing, her reach and striking could lead her to victory, possibly by late stoppage or decision. The odds are extremely close, reflecting just how evenly matched these two contenders are.
