Dallas Mavericks President of Basketball Operations and General Manager Nico Harrison, left, and head coach Jason Kidd, right, pose for photos with the No. 1 overall draft pick Cooper Flagg, center, following an NBA basketball press conference at the team’s practice facility Friday, June 27, 2025, in Dallas. (AP Photo/Tony Gutierrez)
Opening night at NBA Summer League in Las Vegas has turned into an annual spectacle, and this year will be no different.
Cooper Flagg’s debut is coming — against Bronny James, no less.
Flagg, the No. 1 pick in this year’s draft, and the Dallas Mavericks will open summer play Thursday against the Los Angeles Lakers. The Lakers, always a huge draw in Las Vegas, have 2024 second-round pick Bronny James — the son of NBA scoring king LeBron James — on their summer roster.
READ: NBA: Cooper Flagg looks comfortable in Dallas
The game at UNLV’s Thomas and Mack Center will be packed. Plenty of NBA players and personnel will be there. Some courtside tickets are being listed on the secondary resale market at more than $3,000 a pop. All this, mind you, for an exhibition game where the outcome is almost certain to be forgotten within a few days.
“I’m excited,” Flagg said. “I’ve been in the gym with the guys, and I’m excited to just get out there, get back on the court, play some 5-on-5.”
It will be a circus atmosphere for Mavericks-Lakers and Day 1 of the full-fledged, 30-team Summer League — other smaller summer leagues in Utah and California wrapped up earlier this week — is certain to be announced as a sellout.
READ: NBA: Bronny James says he doesn’t follow rumors around LeBron
The scene will likely resemble what awaited Victor Wembanyama for his San Antonio debut in 2023 (hundreds of people gathered around the tunnel with their phones out to grab a photo or video of him simply coming out for warmups that night) or Zion Williamson’s debut in 2019 with New Orleans — when an earthquake centered in California shook Las Vegas enough for play to be stopped early for the night.
“I just want to go out, show I’ve improved, show I’ve gotten better,” Flagg said.
Some of what to know about Summer League:
NBA Summer League schedule and format
It starts Thursday and runs through a championship game on July 20. All teams will play a four-game regular season, and then the top four teams will head to the playoffs for a semifinal game on July 19 and the title game one day later.
The 26 teams that don’t make the playoffs will be matched up for one last game, a consolation bracket of sorts.
All teams will play at least five games in Las Vegas; the championship-game qualifiers will play six.
Quarters are 10 minutes long, instead of the usual 12 for NBA games. Nobody fouls out until they commit their 10th foul, instead of the usual six-and-you’re-out rule. Overtimes are two minutes, not the usual five.
The ‘heave’ rule
In place for NBA Summer League: a rule that says players who take those end-of-quarter shots from really, really deep won’t count against their individual shooting percentage.
The so-called “heave rule” says any shot taken within the final three seconds of the first three quarters and is launched from at least 36 feet away on any play that starts in the backcourt will count as a team shot attempt — but not an individual one.
Many players have avoided taking the miracle 50-footer or deeper shot at the end of quarters to protect their personal shooting percentages. The “heave rule” fixes that.
As with many rule changes, it’s getting tried out in summer leagues before likely being implemented as an NBA rule. It was used for the games earlier this month at the summer leagues in Utah and California.
NBA Summer League: What to expect
If form from past years hold, don’t expect the high draft picks — like Flagg, No. 2 pick Dylan Harper of San Antonio, No. 3 pick VJ Edgecombe of Philadelphia and No. 4 pick Kon Kneuppel of Charlotte — to log big minutes for their teams in Las Vegas.
Harper (groin) and Edgecombe (thumb sprain) have already been ruled out for the San Antonio-Philadelphia game on Thursday night, one that will immediately follow the Mavs-Lakers game as part of an ESPN doubleheader from Day 1.
It’s not uncommon for top picks to be shut down after playing a game or two. Edgecombe missed the final two games of Philadelphia’s three-game run in Utah, and Harper missed all three of San Antonio’s games at the California Classic.
What else is happening at the NBA Summer League
Think of Summer League in Las Vegas as the NBA’s annual convention: A slew of players, coaches, agents and executives are there for at least some of the event. It has grown steadily over the last 20 years, with no end in sight.
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There’s also a Board of Governors meeting in Las Vegas early next week, and it seems likely that Commissioner Adam Silver will announce plans for the league to formally begin looking at expansion — though there is no guarantee that the NBA will ultimately decide to add teams.