Inside The Spurs

Stephon Castle Reveals Lessons From Gregg Popovich Before Retirement

San Antonio Spurs guard Stephon Castle had limited time with Gregg Popovich last season, but he still took away several lessons.
Apr 13, 2025; San Antonio, Texas, USA; San Antonio Spurs guard Stephon Castle (5) looks to the scoreboard during the second half against the Toronto Raptors at Frost Bank Center.
Apr 13, 2025; San Antonio, Texas, USA; San Antonio Spurs guard Stephon Castle (5) looks to the scoreboard during the second half against the Toronto Raptors at Frost Bank Center. | Scott Wachter-Imagn Images

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Stephon Castle got the same number of games under Gregg Popovich that De'Aaron Fox got with Victor Wembanyama last season.

A mild stroke eventually pushed the San Antonio Spurs' Hall-of-Famer to retire from the sidelines just a few games into the season, while a pair of season-ending injuries sidelined Wembanyama and Fox. Both stints proved beneficial.

Fox determined that he and Wembanyama had the makeup to be the "best pick-and-roll duo" in the NBA; Castle, meanwhile, learned to take his time.

Castle Speaks on Popovich

“I only played five, six games with Coach Pop," Castle said in an interview with ESports Insider, "but on that short scale, I feel like I learned a lot from him ... not speeding my way to things, just taking time with it and letting it come. I feel like that’s what I did last year in workouts.”

From the jump, Castle impressed Popovich with his work ethic. The sizable guard was quick to listen, slow to speak and coachable.

"(He's a) really mature young man," Popovich said after one week of training camp. "Has a great demeanor and way about him ... has a good basketball IQ."

Even Wembanyama gave the then-rookie his flowers.

“I see him fitting (in) very well,” Wembanyama said. “I’ve seen exponential progression from him from one practice to the other. The way he learns is pretty impressive.” 

San Antonio Spurs guard Stephon Castle (5) and center Victor Wembanyama (1) celebrate in the second half against the Los Ange
Nov 27, 2024; San Antonio, Texas, USA; San Antonio Spurs guard Stephon Castle (5) and center Victor Wembanyama (1) celebrate in the second half against the Los Angeles Lakers at Frost Bank Center. | Daniel Dunn-Imagn Images

Castle quickly embedded himself in Mitch Johnson's rotation after Popovich took his leave of absence. Having learned under UConn's Dan Hurley, the transition wasn't intimidating. Especially when he arrived with the coach's seal of approval.

"Steph is a warrior," Hurley told Spurs On SI. "He's not going to run from the expectations of winning."

Next season, Johnson's return will provide San Antonio the familiarity it needs to make Year 1 without Popovich even less daunting. The Spurs, searching for their first playoff berth since 2019, have a long road ahead of them. But their mindset won't change.

"We've tried to win every game that we've played in," Castle told Spurs On SI. "And (next season), that doesn't change."

No longer a rookie, Castle has a larger role waiting for him. But between him, Wembanyama, Fox and Mitch Johnson, a lot remains the same. He sees that as a plus.

"We still have our same core guys," Castle told Spurs On SI. "I've always been confident in the guys in our locker room. (That) confidence really doesn't change much."

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Matt Guzman
MATT GUZMAN

Matt Guzman is a sports journalist and storyteller from Austin, Texas. He serves as a credentialed reporter and site manager for San Antonio Spurs On SI. In the world of professional sports, he’s a firm believer that athletes are people, too. He aims to spotlight the true, behind-the-scenes character of players and teams through strong narrative writing and sharp, hooking ledes.

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