What happened: Waldo Cortes-Acosta questioned Johnny Walker's durability ahead of their clash in the UFC Vegas 124 main event, stating Walker had "no chin" at 205 pounds. Cortes-Acosta asserted that Walker's vulnerability will carry over into the heavyweight division.

Why it matters: Walker's move to heavyweight represents a pivotal career reset after competing at 205 pounds. For Cortes-Acosta, a win over a seasoned veteran solidifies his position in the heavyweight rankings.

What to watch: The heavyweights square off Saturday in Las Vegas to cap the main card.