UFC Vegas 124 Line Movement: Two Fights Have Flipped Since Opening

Mar 21, 2026; London,UNITED KINGDOM; Mantas Kondratavicius (red gloves) leaves the arena after defeating Antonio Trocoli (blue gloves) during UFC Fight Night at O2 Arena. Mandatory Credit: Peter van den Berg-Imagn Images The biggest moves on Saturday's card at the Meta APEX are in the prelims and the lower main card. Thomas Petersen versus Gabriel Lourenco has flipped favorites, and Mantas Kondratavicius has gone from a pick'em to a heavy favorite. The headliner, Waldo Cortes-Acosta against Johnny Walker, has also tightened.The Biggest SwingsKondratavicius opened at -108 against Andre Petroski, who was also -108. This week FanDuel has Kondratavicius at -300 and Petroski at +240. Some books show Kondratavicius as high as -333. That is roughly a 200-point move from a true pick'em, and it is the largest on the card. I found no injury or camp report explaining it, so I read it as the market deciding the opener was simply wrong. A line that opens dead even and then runs one way usually means sharp bettors saw a clear stylistic or power edge.Petersen versus Lourenco is the full flip. Lourenco opened -230 and Petersen +193. The prices now are Petersen -162 to -175 and Lourenco +136 to +145. Bettors have effectively taken a heavyweight underdog and made him the favorite, a swing of about 370 points.Seokhyeon Ko also keeps stretching. He opened -350 against Wellington Turman and now sits at -700 to -750, with Turman out to +500 or so. Elijah Smith went from -200 over Davey Grant to -270 to -320, and Jose Souza went from -155 over Jonny Parsons to roughly -230 to -240. Our Current Best OffersChannel debug: the fights Main Event and Co-MainCortes-Acosta opened at -300 with Walker at +247. The line has tightened toward Walker, to about -205 to -230 for Cortes-Acosta and +170 to +190 for Walker. Early-moving books had Walker around +240 before the shift as the early action came on Walker as soon as the line opened.There's a clear storyline behind this one. Walker stepped in against Cortes-Acosta after Sean Brady was injured, and the fight became the main event only about a week ago. A short-notice replacement often gets a better price than he deserves, and bettors are clearly taking it. Walker is also a knockout threat, and a heavyweight with power can always land a single shot.The round total is the other tell. The over on 1.5 rounds is about -195, so the market expects a short, violent fight. Both heavyweights have knockout power, so the favorite's price matters more than usual. If you think this ends in the first two rounds, Cortes-Acosta at -205 to -230 is a lot to pay for a fight that one punch can flip.The co-main, Tatiana Suarez versus Virna Jandiroba, has moved the other way. Suarez opened -210 and Jandiroba +177. Current numbers are Suarez -185 to -200 and Jandiroba +160 to +165. That is a small drift toward the underdog, not a real reversal.Other Movers Worth a LookKarine Silva opened -275 over Gabriella Fernandes and is now about -225, with Fernandes shortening from +228 to +180 to +185.Marcos Degli opened -300 over Mitch Raposo and has eased to -225 to -230.Nina Milosevic grew from -350 to -500 over Priscila Cachoeira.Keiichiro Nakamura moved only slightly, from -325 to -350 or -360 over Ollie Schmid.The pattern is that the market doubted both the biggest favorites on the prelims (Silva, Degli) and shortened a few underdogs. It also pushed several lines to extremes (Ko, Milosevic, Kondratavicius). Anyone taking a -700 favorite is paying a steep price for a result that already looks likely. Our Current Best OffersChannel debug: the fights