Serghei Spivac (pressure wrestler, ground pounder, clinch grinder) against Gregory Rodrigues (power puncher, pressure boxer, opportunistic) is a UFC heavyweight matchup in —. The independent model puts Rodrigues around 52% — a low confidence number, not a betting line. The largest factor from 50/50 is striking skill (distance & pocket): Spivac striking rating 1480 vs Rodrigues 1740. Weighted by estimated standing time (68%).

Where this is fought matters. Estimated grappling share is 32%. Spivac lands 3.2 significant strikes per minute at 52% accuracy with a 3.8 takedown average; Rodrigues is at 5.2 / 51% / 1.6. Takedown defense sits at 72% versus 61%. Reach is 78" against 75" — counted only if the longer fighter actually lives at range.

Spivac's primary path: Chain takedowns on Rodrigues's 61% defense, hold mat time, and win the control/attrition round. Failure mode: The chin has been a problem. One pocket exchange can end the math. Rodrigues's primary path: One clean counter or lead hook as Spivac enters. Power is the shortcut; it is not a plan by itself. Failure mode: If the first takedown lands, Rodrigues may spend the round on the fence or on their back.

The swing variable is simple: If Spivac cannot keep this on the mat in the first eight minutes, Rodrigues's striking becomes the fight. The model does not start from a sportsbook. If DraftKings or Fanatics disagree, that disagreement is the point of the page.