The San Antonio Spurs may have fallen short of winning the NBA championship last season, but their unexpected run to the Finals provided something arguably just as valuable: experience.

For a young team still learning how to compete at the highest level, reaching the Finals was a huge statement. And now, Stephon Castle has offered an intriguing insight into what he and his teammates discovered during that remarkable postseason journey.

Castle entered the 2025-26 campaign as only a second-year player, yet his age rarely looked like a weakness. Instead, the San Antonio guard quickly established himself as one of the team’s most important players, particularly because of his defensive ability and rapidly developing offensive game.

His performances helped the Spurs navigate a postseason that few expected them to dominate to such an extent.

San Antonio eventually battled its way through the Western Conference and earned a place in the NBA Finals, despite much of its core having little or no previous playoff experience. Veterans such as Harrison Barnes and Luke Kornet provided valuable leadership, but the responsibility largely rested on a young group led by Victor Wembanyama and Castle.

Rather than being overwhelmed by the pressure, the Spurs repeatedly found ways to rise to the occasion.

Their journey finally ended against the New York Knicks in the Finals, but the experience appears to have left Castle with a completely different understanding of what postseason basketball demands.

Months after the defeat, Castle reflected on the biggest adjustment he had to make when moving from the regular season into the playoffs.

And his answer revealed just how different the game becomes when every possession matters.

According to Castle, playoff basketball requires an extraordinary level of preparation because teams repeatedly face the same opponent. There is far less room for surprise, and weaknesses are identified and attacked relentlessly.

The Spurs guard explained that everything becomes much more detailed. Instead of simply preparing for an opponent they may see once or twice during the regular season, playoff teams can face each other several times in succession.

That forces players to understand every tactical detail.

For Castle, that experience appears to have been one of the biggest learning opportunities of his young career.

The lesson could prove extremely important heading into the 2026-27 season.

San Antonio is no longer the inexperienced group that arrived in last year’s postseason. The Spurs now know what it takes to survive playoff pressure, how opponents adjust from game to game and how much preparation is required when a championship is within reach.

That experience could make them considerably more dangerous.

At the centre of San Antonio’s ambitions remains Victor Wembanyama, whose partnership with Castle has already generated plenty of excitement.

The two young stars have developed an increasingly impressive connection, with their complementary abilities giving the Spurs a foundation that could eventually become one of the league’s most difficult combinations to contain.

Castle’s defensive intensity provides another dimension alongside Wembanyama’s extraordinary size and versatility, while his continued offensive development could make the partnership even more formidable.

The Spurs therefore enter the new season with something they did not have before their Finals appearance: genuine postseason scars and lessons.

They now know what it feels like to play on the biggest stage.

They know how quickly opponents can exploit mistakes.

And, perhaps most importantly, they know exactly how much more they need to improve if they want their next Finals appearance to end differently.

Castle’s comments suggest that the young guard has already begun absorbing those lessons.

The disappointment of losing the championship may still linger, but San Antonio can use it as fuel.

If Castle continues developing, Wembanyama takes another leap and the rest of the roster builds on its first postseason experience, the Spurs could enter the 2026-27 campaign with considerably greater expectations.

Last season proved that this young San Antonio team can reach the Finals.

Now comes the difficult part: proving that it can go one step further.