Best Stephon Castle player prop bets for Spurs vs. Knicks NBA Finals Game 5 on 6/13/26

Down 3-1 in the NBA Finals, the San Antonio Spurs risk elimination in front of the home crowd tonight. Stephon Castle has played a key role throughout the postseason, but he needs to be better if his team is to keep their season alive with the pressure turned up to the max at the Frost Bank Center. Can the young guard rise to the occasion?

Here are the top Stephon Castle prop bets on DraftKings Sportsbook for Saturday’s Spurs vs. Knicks Game 5 in the NBA Finals.

Best Stephon Castle prop bets

The 2024-25 NBA Rookie of the Year, Stephon Castle improved during his second professional season. He bumped his statistical production up in all three major categories as well as in terms of scoring efficiency. In the NBA Playoffs, he’s taken another slight stride forward to 18.7 PPG, an uptick from his 16.7 PPG in the regular season. He’s also dished out 6.2 assists per game while pulling down 5.0 rebounds, but clearly, San Antonio needs more from the young guard.

Against the Knicks in this series, Castle has already experienced some peaks and valleys. It’s no coincidence that the one game the Spurs won saw him produce 23 points on 8-for-14 shooting (57.1%), also pitching in five rebounds and five assists. That was surrounded by some rougher showings in Game 2 and Game 4, in which he capped out at 14 points on a FG% of 35.7% or lower. In total, Castle sits at 16.8 points, 5.5 rebounds and 4.3 assists per game in the NBA Finals with a 43.1% FG% and 35.3% 3P%.

Tonight, DraftKings Sportsbook lists Castle’s prop bet lines at O/U 16.5 points, 4.5 rebounds, 6.5 assists and 1.5 three pointers. His combined PTS + REB + AST line comes in at 28.5, just as it did last game.

There’s one key commonality surrounding Castle’s production across all four games of this series — he’s yet to record more than five assists in any single game. That’s a significant development to say the least.

Last time out, we faded Castle’s assists prop with the under on 6.5, which cashed. I wrote in that article that while he averaged 7.6 assists a game in the Western Conference Finals, the guard still remained under this prop line three times in that series. That means that over his last 11 games since the start of that round, Castle has failed to go over 6.5 assists a grand total of seven times. With that in mind in combination with the fact that the Spurs’ see a slight dip in shooting efficiency at their own arena as opposed to on the road, I’m quite comfortable taking this under again tonight.

De’Aaron Fox has eaten up much of the usage for the guards and Victor Wembanyama remains the clear focal point for the team’s offense, meaning there’s a little less work for Castle. With the Knicks’ defense playing up to the peak of its powers and three of the four games in this series staying under the total, there are just so many factors working in the favor of the under on his dimes tonight.

Best bet: Stephon Castle under 6.5 assists (-110)