The San Antonio Spurs and Oklahoma City Thunder lead the 2027 NBA championship market as the league's clearest frontrunners entering the 2026-27 season, buoyed by their status as the two youngest, deepest Western Conference powers. The Spurs return nearly their entire roster from a 62-win campaign and Finals appearance, anchored by Victor Wembanyama's continued ascent as the unanimous Defensive Player of the Year and a dominant two-way force, alongside emerging contributors like Stephon Castle and Dylan Harper plus veteran addition Tobias Harris. The Thunder, coming off 64 regular-season wins and a Western Conference finals loss, retain Shai Gilgeous-Alexander, Jalen Williams, and Chet Holmgren despite offseason roster tweaks to manage the second apron. In the East, the defending champion New York Knicks and a bolstered Philadelphia 76ers group create additional contention, with recent parity across multiple contenders keeping implied probabilities tightly clustered among the top four.