The Boston Celtics have undergone a seismic shift in their frontcourt, with stalwarts Al Horford, Kristaps Porzingis, and Luke Kornet no longer anchoring the paint. To fill the void, the team is turning to a versatile group of bigs—Neemias Queta, Luka Garza, Xavier Tillman Sr., and Chris Boucher—to redefine their frontcourt identity. While the Celtics can lean on their wings to slide up a position, it’s the traditional bigs who are expected to carry the load, and among them, Xavier Tillman Sr. stands out as a returning player poised to make a significant impact.
Tillman, a versatile big man capable of thriving as a standalone center or in double-big lineups, is embracing a new challenge: mastering the dynamic role of the power forward, or the “four spot.” His guide in this transformation? None other than his new teammate, Chris Boucher, a seasoned veteran whose approach to the position is opening Tillman’s eyes to new possibilities.
At a recent shootaround before the Celtics’ preseason clash with the Cleveland Cavaliers on October 12, 2025, Tillman shared insights with Hardwood Houdini about how Boucher’s influence is reshaping his game. “That four spot is a little bit different,” Tillman admitted. “I like to watch Chris a lot because he’s been playing the four for the majority of his career.”
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For Tillman, who previously viewed the power forward role as a static position—relegated to camping in the corner for catch-and-shoot opportunities—Boucher’s dynamic style has been a revelation. “You’ve always got to be active at the four spot,” Tillman explained. “A lot of times, I thought the four just kind of hung out in the corners and waited for catch-and-shoots, but [Boucher] would always look for his man to turn his head for a backdoor or fall asleep and then face cut him for a rebound or a cut.”
Boucher’s knack for exploiting defensive lapses—whether through timely backdoor cuts, aggressive offensive rebounding, or slashing to the rim—has given Tillman a blueprint for elevating his own game. It’s not just about standing still and waiting for the ball; it’s about constant movement, reading the defense, and seizing every opportunity to attack.
Tillman’s ability to implement these lessons has been bolstered by his improved physical condition. After shedding 12 pounds this offseason and rehabbing a knee injury, he’s moving with newfound agility. This leaner, healthier version of Tillman is primed to capitalize on the corner crashes and basket cuts he’s learning from Boucher. These skills aren’t just theoretical—they’re practical tools that can help him score, extend possessions, and keep the Celtics’ offense humming.
As Tillman adapts to Boston’s faster-paced offensive system and more aggressive defensive approach, his versatility makes him a linchpin in the team’s committee-based frontcourt. Whether anchoring the paint as a traditional center or roving the floor as a dynamic four, Tillman’s ability to learn and evolve ensures he’ll be a key contributor.
The Celtics’ frontcourt overhaul has thrust players like Tillman into the spotlight, and with Boucher as his muse, he’s embracing the challenge of redefining his role. By studying Boucher’s relentless activity and opportunistic playstyle, Tillman is unlocking new ways to impact games—whether it’s crashing the boards, slicing to the rim, or making defenses pay for losing focus.
As the 2025-26 season looms, Tillman’s transformation offers a glimmer of optimism for a Celtics team navigating uncharted waters. With a committee approach to replacing their departed bigs, Boston is banking on players like Tillman to rise to the occasion. And if his early lessons from Chris Boucher are any indication, Tillman is well on his way to becoming a game-changer in the frontcourt.