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Spurs debut three-guard lineup of Fox, Harper, Castle in preseason win

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Michael C. Wright

October 17, 2026

The San Antonio Spurs experimented with a new three-guard lineup featuring De'Aaron Fox, Dylan Harper, and Stephon Castle during a 123-103 preseason victory over the Phoenix Suns. This strategic shift highlights coach Mitch Johnson's focus on perimeter versatility and offensive pace.

A New Era for the Spurs Backcourt

The San Antonio Spurs showcased a significant tactical evolution during their recent preseason victory against the Phoenix Suns, ending with a decisive 123-103 scoreline. At the heart of this performance was the highly anticipated deployment of a three-guard lineup featuring De'Aaron Fox, Dylan Harper, and Stephon Castle. By integrating these three distinct playmakers, coach Mitch Johnson signaled a departure from traditional positional play, aiming to capitalize on the speed and floor spacing that a guard-heavy rotation provides.

Tactical Implications of the Three-Guard Set

The decision to start Fox, Harper, and Castle simultaneously represents an aggressive approach to modern basketball, where versatility often outweighs size. By fielding three primary ball-handlers, the Spurs effectively increased their transition pace and perimeter shooting threat, which proved overwhelming for the Suns' defensive scheme. This lineup allows for constant motion, forcing opponents to make difficult switches and creating open lanes for cutters, a fundamental aspect of the Spurs' offensive philosophy under Johnson.

Impact on Team Dynamics and Development

For young talents like Dylan Harper and Stephon Castle, sharing the court with an established veteran like De'Aaron Fox offers a unique developmental opportunity. The mentorship and on-court synergy developed during these preseason minutes are critical for building chemistry ahead of the regular season. This configuration not only tests the defensive adaptability of the guards but also challenges the team to maintain structural integrity while playing a smaller, faster brand of basketball.

Analyzing the Preseason Performance

A 20-point margin of victory against a formidable opponent like the Phoenix Suns serves as a strong indicator of the lineup's potential. While preseason results are often scrutinized for their lack of intensity compared to regular-season games, the efficiency of the Spurs' offense suggests that the three-guard experiment has merit. The ability to generate 123 points indicates that the ball movement and decision-making within this specific rotation were operating at a high level.

Looking Toward the Regular Season

As the Spurs transition from preseason exhibitions to the rigors of the regular season, the performance of this three-guard unit will likely dictate future rotation patterns. Coach Mitch Johnson faces the task of balancing this offensive firepower with the defensive requirements of the league. If the team can maintain this level of scoring efficiency while shoring up their perimeter defense, they may have found a potent weapon capable of disrupting more traditional lineups across the NBA. The success of this experiment remains a key storyline to watch as the team refines its identity.

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