Oklahoma City Thunder's sweep of the Phoenix Suns 4-0 in the Western Conference first round has solidified their status as defending 2025 champions and No. 1 seed, propelling trader consensus to a 52.5% implied probability for the 2026 NBA title amid their young core's dominance led by Shai Gilgeous-Alexander and Chet Holmgren. San Antonio Spurs advanced 4-1 over Portland at 17.3%, buoyed by Victor Wembanyama's breakout sophomore campaign and strong head-to-head edge versus OKC during the regular season. Boston Celtics hold 12.8% after taking a 3-2 series lead over Philadelphia, though Joel Embiid's 33-point Game 5 explosion exposed vulnerabilities in the No. 2 East seed's defense, tempering expectations despite home-court advantages ahead. Ongoing first-round uncertainty for Cavaliers, Nuggets, and Knicks keeps their shares modest at 4.0%, 3.8%, and 3.6%.