Stop Sleeping on Castle

The San Antonio Spurs have a generational talent hiding in plain sight; and no, we're not talking about the 7-foot-3 alien.

There's a particular cruelty to being great at the same time as someone historic. Ask Scottie Pippen, or Pau Gasol, or every talented player who ever had the misfortune of sharing the locker room (and the spotlight) with someone the basketball gods clearly had bigger plans for.

Stephon Castle knows this feeling better than most. He plays alongside Victor Wembanyama, the most physically extraordinary basketball player the sport has ever seen, and every night the cameras pan to Wemby for his fans to continue adoring him. Meanwhile, Castle is quietly having one of the most impressive sophomore campaigns in recent NBA history; and if you're not paying attention, you're missing something special.

The case for Castle starts where all good verdicts do: the raw data. And it is startling.

Through the 2025-26 regular season, Castle averaged 16.7 points, 7.4 assists, and 5.3 rebounds per game — a statistical profile built on both ends of the floor, which is something that I’ll touch on more later. Consider Scottie Pippen's second season, often held up as the moment the league realized he was something special: 14.4 points, 6.1 rebounds, and 3.5 assists. Castle's sophomore line blows that out of the water, and Pippen went on to be a Hall of Famer and one of the greatest two-way players the sport has ever seen. Additionally, Castle’s true shooting percentage sits at 57.6%, which, given the legitimate questions about his outside shot entering the season, is a quiet revelation.

But the number that should make every NBA front office pay attention? The assists. 7.4 dimes per game as a 21-year-old in only his second professional season, operating within a crowded backcourt that already includes De'Aaron Fox and rookie Dylan Harper. Most would see that as a player happening to find space--but not Castle. That’s him making space.

Compare that to his rookie campaign: 14.7 points and 4.1 assists in 26.7 minutes per game, on 42.8% from the field and a painful 28.5% from three. Nobody expected a straight line from there to here. Rookies with shooting questions don't typically become efficient scorers in year two, yet Castle did.

The Leap Was Large, and It Was Earned

There was real, warranted skepticism heading into this season. The Spurs had added Fox in a blockbuster trade and selected Harper with the No. 2 overall pick, giving San Antonio three guards who all needed the ball. The conventional wisdom said Castle would get squeezed, getting fewer touches, a diminished role, maybe even a step backward in his development.

He answered every single one of those doubts.

His scoring jumped from around 12 PPG in his first year to nearly 16.8 in his second, not through volume but through craft. He developed a mid-range game that has become quite difficult to guard. He stopped relying solely on his athleticism to get to the rim and started weaponizing his footwork, positioning, and basketball IQ instead. In a league that increasingly rewards players who can create quality shots in the flow of an offense, Castle became exactly that.

His playmaking evolution has been even more impressive. Castle seemed to grow as more of an architect than a mere scorer. He began threading the ball through traffic, making the right read at pace, and trusting teammates in critical moments. These aren't skills that typically arrive this fast. Most guards take four or five seasons to develop the kind of court vision Castle is flashing at 21.

The Part the Box Score Doesn't Capture

Here's where the conversation about Stephon Castle gets fascinating, and where advanced metrics start telling a story the average box score simply can't.

His defense is not just good: His defense is elite. Castle has spent this entire season drawing the opposing team's most dangerous perimeter assignments, making them miserable. Stars like Luka Dončić, Shai Gilgeous-Alexander, and Cade Cunningham all felt it. Castle has the rare combination of length – a 6-foot-9 wingspan on a 6-foot-6 frame – the lateral quickness to stay in front of shifty ball-handlers, and the strength to not get bullied off the line.

Despite not racking up flashy steal totals, his defensive impact registers in the numbers that actually matter: forced turnovers, contested shots, and opponents settling for difficult looks outside their comfort zone. Castle held Luka Dončić to 38.1% shooting, Shai Gilgeous-Alexander to 31.6%, Cade Cunningham to 23.1%, and Devin Booker to 22.2% in their matchups this season. Those are some of the premier scorers in the world, and he turned them into inefficient guessers. 

But Castle is not dragged into these assignments: he campaigns for them. “I take a lot of pride in that,” Castle told ESPN’s NBA Today. “I ask for those matchups. I would not want it any other way. I feel like I can be one of the best perimeter defenders in the league.” The playoffs have only hammered the point. Julius Randle, a 22-point-per-game scorer during the regular season, averaged just 12.8 points against the Spurs in their second-round series; shooting 34.2% from the field. He had three points and a -34 plus/minus in the closeout Game 6, and then skipped his team’s final press conference afterward. When a player won’t even face reporters after facing your defense, you’re doing something right.

That kind of point-of-attack disruption is the currency that wins playoff series. Championship teams are built on it, and the Spurs, who are in the middle of a legitimate postseason run, have that weapon already on their roster. He’s 21 years old, and his name is Stephon Castle.

The Playoffs: Turning It Up When It Matters Most

If the regular season hadn't made his case, the postseason is making it unmistakably clear. Through nine playoff games, Castle has averaged 18.9 points, 6.1 assists, and 4.3 rebounds, elevating his game precisely when it mattered most.

In Game 4 of the Western Conference Semifinals against the Minnesota Timberwolves– a 114-109 loss– Castle delivered 20 points, six rebounds, and four assists in 37 minutes, shooting 8-of-17 from the field even with Wembanyama getting ejected, leaving the Spurs needing someone to step into the chaos and hold things together. Who held it together?

Stephon Castle.

Most people see Castle as Wemby’s supporting cast. But how much more clear can it be that he is actually Wemby’s co-star?

Verdict: Stop Sleeping On Castle

Victor Wembanyama is going to be one of the greatest players in the history of the sport. That’s not hyperbole. The cameras will follow him as the contracts orbit him, and the casual fan’s attention will always drift back in his direction. That’s fine, and that’s basketball in 2026.

But Stephon Castle deserves his own conversation. He deserves to be talked about as one of the best young guards in the NBA, because by every meaningful metric available, that’s exactly what he is. At 21 years old, he’s already made the jump from 28.5% to 33.2% from three in a single season; and that’s on top of everything else he already brings. Nearly 17 points, 7.4 assists, lockdown perimeter defense, and a three-point shot that is surely becoming a weapon. In the playoffs, he’s gone nuclear.

The Spurs are a legitimate contender, and Stephon Castle is a significant reason why.

It's time to stop talking about him as Wemby's teammate, and start talking about him as exactly what he is: one of the most exciting, most complete young players in the NBA.

The king deserves his throne.