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The Isaac Dulgarian vs. Yadier del Valle fight has come under immense scrutiny due to some sketchy betting lines ahead of the fight.Dulgarian came into this UFC Vegas 110 fight as the favourite. However, reports suggest that the pre-fight betting lines changed drastically in favour of his rival, Del Valle, just hours ahead of the clash.Val Dewar posted a screenshot of how the line had changed for Dulgarian as the fight got closer.Dulgarian had won his debut UFC fight but lost to del Valle in the first round via a submission. While del Valle came into this fight undefeated, he wasn’t as experienced as his rival.Things took another dramatic turn when several sports books decided to refund their customers which raised further suspicion about the UFC Vegas 110 fight.William Hill US @WilliamHillUSLINKMobile customers with losing bets on the Dulgarian UFC fight will receive a cash credit within 24 hours (singles), or within 24 hours of the last leg being determined (Parlay/SGP/Super Parlay) should that bet have won without that leg included.Caesars Sportsbook Support @CaesarsHelpLINKMobile customers with losing bets on the Dulgarian UFC fight will receive a cash credit within 24 hours (singles), or within 24 hours of the last leg being determined (Parlay/SGP/Super Parlay) should that bet have won without that leg included.Fana also raised their voices seeing this incident, and some questioned the integrity of the fight while others wanted more betting sites to refund their customers.FULL SEND MMA @full_send_mmaLINKI’m hearing the Isaac Dulgarian and Yadier Del Valle fight has been pulled from some books. The line has gone from -250 all the way down to -166. Which means a crazy amount of money has come in on Del Valle in the last couple hours. #UFCVegas110Jed I. Goodman © @jedigoodmanLINKHopefully Dulgarian gets a POTN. Great selling.Mike Heck @MikeHeck_JRLINKDulgarian gets absolutely smoked. I'm not fully entrenched in the gambling world, do it for entertainment and content. But seeing everything with the betting lines, this can't be good, right? Pretty sus?Christian Rodriguez @ChrisFresh510LINK@WilliamHillUS @FDSportsbook void the fightchef adel @adel_gtjLINK@WilliamHillUS That’s crazyblanchfieldszn2..0 @mmagladiatorrLINK@WilliamHillUS WoahBrandon @Edwrds21LINK@WilliamHillUS And I was told there’s never been a fixed fight in the ufc😭Nick Wey @piffmasterflex1LINK@WilliamHillUS @DKSportsbook @BetMGM do the right thing void Dulgarian the fight was clearly fixedIt is to be seen what actions, if any, the UFC takes after the fight.Michael Chiesa unhappy with Isaac Dulgarian’s performanceUFC star and analyst Michael Chiesa also wasn’t impressed with how Isaac Dulgarian lost the fight at UFC Vegas 110.Chiesa questioned some aspects of Dulgarian’s technique. He called the performance trash and claimed that Dulgarian couldn’t beat someone in the bottom 500 (h/t MMA Junkie):“You peel the top hand. You don't punch behind you. That is the most useless strike you can possibly throw. I'm sitting here on the pre-show hyping you up as a guy that can go into the top five and win fights, and it doesn't even look like you can fight someone that's in the bottom of the top 500. I've got to be honest here. That was an F- performance. It was absolute trash.”Chiesa rounded off by saying that Dulgarian fought like an amateur and there were many others who deserved the shot on fighting in the UFC than the American.