UFC Vegas 122: Allen vs. Duncan continues on the prelims with a fight between RJ Harris and Allen Frye Jr. in the heavyweight division. Check out our UFC Vegas 122 odds series for our Harris-Frye prediction and pick.
RJ Harris (6-0, 1-0 UFC) is coming off a first-round TKO of Alvin Hines in July, making an impressive promotional debut. Before that, he submitted Peni Latu with a second-round guillotine in April, showcasing his versatility as he comes into his fight this weekend against Allen Frye Jr. at UFC Vegas 122.
Allen Frye Jr. (6-1, 0-1 UFC) lost a unanimous decision to Guilherme Pat in his December 2025 promotional debut. Previously, he stopped Justin Frazier with first-round punches in September, recording his sixth knockout victory, highlighting his power as he comes into his fight this weekend against RJ Harris on Saturday.
UFC Vegas 122 Odds, courtesy of DraftKings:
UFC Vegas 122 Odds: RJ Harris-Allen Frye Jr. Odds
RJ Harris: -355
Allen Frye Jr.: +280
Over 1.5 Rounds: -115
Under 1.5 Rounds: -115
Watch sports LIVE with fuboTV (free trial)Why RJ Harris Will Win
RJ Harris should beat Allen Frye Jr. because his forward pressure and finishing ability offer multiple routes to victory. The unbeaten heavyweight already demonstrated his punching power against Alvin Hines, earning a stoppage in his UFC debut.
Frye’s striking defense is the biggest concern entering this matchup, particularly against an opponent willing to advance and exchange punches. Harris does not need perfect technique if he consistently forces Frye backward and creates opportunities to land damaging shots.
Harris also brings a submission threat, with three of his six professional victories coming through grappling rather than striking. That versatility should discourage Frye from treating clinches as safe territory whenever the exchanges become uncomfortable or Harris starts finding his rhythm.
The physical matchup supports Harris, who weighed 261 pounds compared with Frye’s 246 pounds at Friday’s official weigh-ins. That additional size could help Harris make close exchanges exhausting, although weight alone does not guarantee superior wrestling or control against another heavyweight.
Frye can threaten with his own power, so Harris must avoid reckless entries and respect the counters coming back. Still, I expect Harris to dictate the action, overwhelm Frye during an exchange and secure a TKO victory before the final horn sounds.
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Why Allen Frye Jr. Will Win
Allen Frye Jr.’s path to beating RJ Harris starts with his power, not a prolonged battle of pace and volume. All six of his professional victories came by knockout, with five ending in the opening round, making him dangerous immediately.
Harris applies aggressive pressure, but that approach could create the exchanges Frye needs to land a fight-changing punch before settling in. Rather than retreating passively, Frye must hold his ground selectively and make Harris respect the threat coming back whenever he advances.
Frye’s reach offers another potential advantage, allowing him to touch Harris before the unbeaten heavyweight closes distance and starts throwing combinations. Establishing straight punches early could interrupt those entries and create opportunities for heavier follow-up shots without requiring Frye to win every exchange.
Harris looked impressive against Alvin Hines, but his striking statistics reflect fewer than two minutes of UFC action, limiting their predictive value. Frye should test whether that explosive debut translates against an opponent capable of answering pressure with meaningful heavyweight power under sustained pressure.
Article Continues BelowFrye cannot afford another slow defensive performance, and Harris remains the more versatile threat because of his wrestling and submissions. Nevertheless, the upset case is straightforward: Frye lands early, disrupts Harris’s momentum and earns a knockout victory.
Final RJ Harris-Allen Frye Jr. Prediction & Pick
RJ Harris is my pick to beat Allen Frye Jr., with his finishing versatility providing the clearest advantage. Harris has three submission victories alongside two knockouts, giving him multiple routes to victory.
Frye remains dangerous because all six of his wins came by knockout, including five first-round finishes. Harris must respect that power rather than assuming aggressive pressure alone will overwhelm his opponent.
The key is making Frye defend more than punches, particularly when exchanges bring them into close range. Mixing striking with takedown threats should reduce Frye’s opportunities to plant his feet and throw freely.
Harris also weighed fifteen pounds heavier, which could become useful during clinches and prolonged grappling exchanges. However, his brief UFC debut leaves questions about how effectively he sustains pressure over longer stretches.
Expect Frye to threaten early before Harris establishes a more varied attack. I favor Harris by TKO after forcing defensive reactions and landing damaging follow-up punches.
Final RJ Harris-Allen Frye Jr. Prediction & Pick: RJ Harris (-355), UNDER 1.5 Rounds (-115)