This Celtics Summer League Test Suddenly Feels Bigger Than One Game

Anticipation builds for the clash between the undefeated Hawks and Celtics in the Summer League, as both teams showcase their evolving rosters and emerging stars in Las Vegas.

A matchup of unbeaten teams headlines Monday night’s Las Vegas Summer League slate, with the Atlanta Hawks and Boston Celtics set to meet after both opened the event 2-0.

The biggest name on the floor is Atlanta lottery pick Kingston Flemings, who has already shown why the Hawks wanted him. Across his first three Summer League games, including his run in Salt Lake City, the former Houston guard piled up 22 assists against just three turnovers. He did hit a rough patch in Saturday’s game against the Brooklyn Nets, finishing with nine points, seven rebounds, five assists and six turnovers, but his playmaking has still been the clear story.

That matters for Atlanta, especially after the team traded Trae Young to Washington during the 2025-26 season and created a need for more ball-handling help. Flemings has a real chance to carve out meaningful minutes this season, and this is another chance for him to show he can run an offense cleanly.

Boston, meanwhile, is dealing with a very different kind of summer. The Celtics have undergone a major roster shakeup this offseason after trading away All-NBA wing Jaylen Brown, and that puts more weight on the shoulders of the team’s younger and less proven players.

Hugo Gonzalez is one of them, but the second-year wing has struggled to shoot the ball so far this summer. Boston may also be cautious with some of its key players on the second night of a back-to-back, including Gonzalez and big man Amari Williams, both of whom saw NBA minutes last season.

Dillon Mitchell gave Boston a lift with 24 points on Sunday, but Atlanta’s summer roster looks deeper and more loaded with young talent. Asa Newell, last year’s first-round pick, is in the mix, along with Flemings, Zuby Ejiofor and Henri Veesar.

Atlanta has already beaten San Antonio by 27 points and Brooklyn by seven, and with Boston on tired legs, the Hawks look positioned to keep rolling.

Odds refresh periodically and are subject to change.

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There is a clear logic to the mix, even if the front office is still waiting to see how it all fits together. CJ McCollum gives Atlanta another proven shot creator, Jock Landale adds insurance behind Onyeka Okongwu, and Mouhamed Gueyes option keeps a developmental piece in place, but the move that may say the most about where the Hawks are headed is the one for Devin Carter, a former lottery pick whose defensive upside could make him another useful layer in the bench picture. [Read more 🡒]

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Landales agreement also fits into a wider league-wide run of contract housekeeping, with details emerging on players such as Trey Lyles, Jaylen Clark, Marcus Smart, Norman Powell, Ousmane Dieng, Jaxson Hayes, Josh Okogie and Jusuf Nurkic. One of the more interesting side notes for the Hawks is how little room the deal leaves in their non-taxpayer mid-level exception, which is the sort of constraint that can shape the rest of a teams offseason just as much as the headline move. [Read more 🡒]

Mouhamed Gueye Suddenly Faces A Real Hawks Rotation Threat

Mouhamed Gueye has given the Hawks something to like on the defensive end, where his length and activity have helped him carve out a place on the roster conversation. Atlanta also recently picked up his one-year team option, a sign that the organization still sees value in keeping him around, even as the bigger question remains whether his game can grow enough on the other side of the floor to make him more than a situational piece.

Now the pressure is coming from a different direction, with rookies Zuby Ejiofor and Henri Veesaar turning heads in summer league and adding more bodies to a frontcourt mix that is starting to feel crowded. For Gueye, the path forward is pretty clear: keep defending, cut down the mistakes, and show enough offensive progress to stay ahead of the newcomers, because if that part of his game stalls, Atlanta may start looking at its options sooner rather than later. [Read more 🡒]