Key Takeaways
- Stephon Castle, the 2024‑25 NBA Rookie of the Year, has steadily improved his scoring, rebounding, and playmaking from the regular season into the playoffs.
- In the 2026 NBA Finals against the New York Knicks, Castle averages 16.8 points, 5.5 rebounds, and 4.3 assists per game while shooting 43.1% from the field and 35.3% from three‑point range.
- His best performance in the series came in the Spurs’ lone win, where he posted 23 points (8‑of‑14 shooting), five rebounds, and five assists.
- Throughout the series Castle has never recorded more than five assists in a single game, a trend that persisted from the Western Conference Finals where he went under the 6.5‑assist line in seven of his last 11 outings.
- DraftKings lists Castle’s prop lines for Game 5 at: over/under 16.5 points, 4.5 rebounds, 6.5 assists, and 1.5 three‑pointers, with a combined PTS + REB + AST total of 28.5.
- Given the Spurs’ offensive reliance on De’Aaron Fox and Victor Wembanyama, the Knicks’ stout perimeter defense, and Castle’s recent assist struggles, the under on his 6.5‑assist prop appears to be the most favorable bet.
- Bettors should also consider the modest upside on his points and rebounds props, but the assist market offers the clearest edge based on recent trends and situational factors.
The Spurs find themselves on the brink of elimination, trailing the Knicks 3‑1 in the 2026 NBA Finals and facing a must‑win Game 5 at the Frost Bank Center. Stephon Castle, the young guard who captured Rookie of the Year honors last season, has been a steady contributor throughout San Antonio’s playoff run, yet the pressure of a do‑or‑die scenario raises the question: can he elevate his game when the team needs him most?
During the regular season Castle averaged 16.7 points per game, a figure that rose to 18.7 points in the postseason before the Finals. His all‑around game has also improved, with averages of 6.2 assists and 5.0 rebounds per playoff contest. In the Finals, however, those numbers have dipped slightly to 16.8 points, 5.5 rebounds, and 4.3 assists per game. His shooting efficiency has been inconsistent, posting a 43.1% field‑goal percentage and a 35.3% three‑point mark across the four games played so far.
A closer look at Castle’s game‑by‑game output reveals a pattern of highs and lows. In the Spurs’ only victory of the series, he exploded for 23 points on an efficient 8‑of‑14 shooting night (57.1%), complementing that output with five rebounds and five assists. The other three outings have been far less productive: Castle struggled to find his shot, scoring 14 points or fewer while shooting at or below 35.7% from the field. These fluctuations have left him averaging under 17 points per contest in the series, a figure that falls short of the offensive firepower San Antonio needs to force a Game 6.
One of the most striking trends is Castle’s assist production. Despite flashing solid playmaking numbers earlier in the playoffs—averaging 7.6 assists during the Western Conference Finals—he has failed to surpass five assists in any Finals game to date. Over his last 11 contests dating back to the start of that round, Castle has gone under the 6.5‑assist line seven times. This persistent inability to rack up dimes is exacerbated by the Spurs’ offensive hierarchy, which leans heavily on De’Aaron Fox’s usage and Victor Wembanyama’s interior dominance, leaving fewer opportunities for Castle to create for teammates.
The Knicks’ defense has also been a limiting factor. New York has consistently tightened its perimeter pressure, forcing opponents into lower‑percentage shots and disrupting passing lanes. Three of the four games in the series have stayed under the posted total, indicating a general trend of subdued offensive output when these two teams meet. Considering Castle’s recent assist struggles, the Spurs’ reduced offensive efficiency at home, and the Knicks’ defensive prowess, the odds appear to favor a continued underperformance on his assist prop.
DraftKings Sportsbook has set Castle’s Game 5 lines at: over/under 16.5 points, 4.5 rebounds, 6.5 assists, and 1.5 three‑pointers, with a combined PTS + REB + AST total of 28.5. Given the evidence outlined above, the most attractive wager appears to be the under on his 6.5‑assist prop (-110). While there is some modest upside on his points and rebounds markets—especially if he can find a hot shooting streak—the assist line offers the clearest statistical edge based on recent performance, role usage, and matchup dynamics.
In summary, Stephon Castle remains a valuable piece of the Spurs’ puzzle, but his ability to impact the game in a win‑or‑go‑home setting is uncertain. Bettors looking to capitalize on the prevailing trends should consider the assist under as their primary play, while monitoring any potential shifts in Castle’s shooting efficiency or offensive role that could alter the outlook as the game unfolds.