The San Antonio Spurs have put up a good fight in the Western Conference Finals, but they now face the potential end of the road tonight. The Oklahoma City Thunder are up 3-2 in the series, meaning it’s a win-or-go-home situation for their opponent. As these teams take the floor for Game 6 at the Frost Bank Center in San Antonio, every member of this Spurs group must be at their best to keep the season alive — including Stephon Castle.

Here are the top Stephon Castle prop bets on DraftKings Sportsbook for Thursday’s Spurs vs. Thunder Game 6 in the Western Conference Finals.

Best Stephon Castle prop bets

After winning Rookie of the Year last season, Stephon Castle took another stride in 2025-26. During the regular season, he bumped his scoring average up from 14.7 points to 16.7 PPG, shooting 47.1% from the field and 33.2% from deep after hitting at rates of 42.8% and 28.5% last year. Those numbers alone were a pretty significant improvement, but he also increased his rebounding mark from 3.7 to 5.3 while going from 4.1 assists to 7.4 dimes per game. With all-around production in a featured role, he played an integral part in the Spurs’ leap to second in the Western Conference.

Come playoff time, he’s been even more impressive as a scorer. Castle is averaging 19.5 PPG on a 48.1% FG% and 38.7% 3P%, second most among all San Antonio players. He’s also pulled down 4.9 rebounds with 6.6 assists a night, though his 3.7 turnovers have been a problem at times after dishing out a whopping 20 over the first two games of this series. Still, he’s important to what the Spurs do and has been a standout piece on defense as well.

Tonight, DraftKings Sportsbook lists Castle’s prop bet lines at O/U 17.5 points, 5.5 rebounds, 6.5 assists and 1.5 three pointers. His combined PTS + REB + AST line comes in at 29.5.

Against the Thunder in this series, Castle is averaging 18.6 points, 4.8 rebounds and 7.6 assists for a total of 31.0 combined PTS + REB + AST per game. He had a couple of higher-scoring nights with 24 and 25 points in Games 2 and 5, but he’s otherwise been at 17 points or fewer in the other three matchups. Looking at the bigger picture of his 10 total contests against the Thunder including both the regular season and playoffs this year, he’s at 19.2 points, 4.4 rebounds and 6.2 assists.

There are two main prop bets I like for Castle in tonight’s Game 6. The first of these is under 1.5 made threes. While the guard is shooting 38.7% from deep this postseason, he’s cooled off considerably during this series. He’s hit just 28.0% of his looks from beyond the arc and is 7-for-25 overall, making just one attempt in the first four games before connecting on three last time out. He’s been a streaky shooter in his young career and has split the over/under on this line at eight games apiece in 16 total postseason outings. With the Thunder’s standout defense, under 1.5 made threes feels good since he’s struggled to convert in this series and the under has cashed in 54 of his 84 games overall.

For a more reliable hit rate in the overall matchups against Oklahoma City this year rather than just in the playoff series, look towards under 12.5 REB + AST for Castle. He averages 10.6 REB + AST over his 10 matchups against this team and has gone under tonight’s line in three straight games. In the bigger picture, he’s stayed under the line in seven of his 10 on the year as well as 44 of his 84 total games this season. It’s a compelling pick since OKC has a big frontcourt that can gobble up boards, especially since Castle has five or fewer rebounds in all but one game of the series.

Best bet: Stephon Castle under 1.5 made threes (-132)