The San Antonio Spurs and Oklahoma City Thunder sit atop the 2027 NBA championship market as co-favorites because both Western Conference powers enter the 2026-27 season with elite young cores, recent deep playoff runs, and strong roster continuity. Victor Wembanyama anchors the Spurs after leading them to the 2026 Finals, where they fell to the defending-champion New York Knicks, and he returns healthy following a dominant campaign that included Defensive Player of the Year honors. The Thunder, 2025 champions who reached the Western Conference finals last season, retain Shai Gilgeous-Alexander, Jalen Williams, and Chet Holmgren despite offseason role-player departures, with the core expected to maintain contention-level depth. The Knicks and 76ers trail in the implied probabilities after Philadelphia added LeBron James, underscoring how the clustered top tier reflects tight Western Conference parity and the established talent pipelines of the leading contenders.