By the time Jaylen Brown was ejected from Tuesday night’s 125-116 loss to the San Antonio Spurs, Boston Celtics teammate Ron Harper Jr. had already scored eight points. He subbed in alongside Jayson Tatum and Neemias Queta as soon as Brown left the floor and made the most of the opportunity.
In the third quarter, with just over four minutes remaining, Baylor Scheierman drove and found Harper wide open in the corner. He bounced a no-look pass to Harper, who drained the 3-pointer despite 7-foot-4 Victor
Wembanyama charging full extension to contest. That shot cut San Antonio’s lead over Boston to 85-83. It also ignited the 25-year-old’s confidence, and he ran with it.
“He’s been great,” Celtics coach Joe Mazzulla told reporters, per NBC Sports Boston. “He’s continuing to get better on both ends of the floor. Tonight, it was the shooting, but I think his defense is just as impactful as everyone else’s. He’s just another guy that can impact winning for us.”
The fourth quarter became Harper’s canvas, and he painted his career masterpiece as a two-way player.
San Antonio entered the fourth with a 97-90 lead, but Harper stayed determined. With Brown out and Tatum struggling (just 4-of-14 from three), Harper stepped up off Boston’s bench. He led the Celtics in scoring in the final 12 minutes of regulation with 11 points, doubling his previous career-high with 22 points in just over 33 minutes.
Harper was responsible for the bulk of Boston’s bench points (34 total), converting 6-of-9 attempts from beyond the arc. His teammates trusted him as the fourth quarter progressed, and he rewarded them by keeping the Celtics within striking distance during their late-game push for a comeback.
There was no hesitation in Harper’s release. He wanted the ball, regardless of the mounting pressure that came with overcoming Brown’s unforeseen exit plus Payton Pritchard’s unavailability (neck spasms). Without Harper’s initiative to embrace the opportunity in front of him, the Celtics might have suffered a blowout that would have forced Mazzulla to empty the bench shortly after Brown headed to the locker room.
Boston’s starting lineup shot only 10-of-33 from 3-point range, making Harper’s breakout critical.
Harper’s career night was even more sentimental as he competed opposite his brother, Dylan, whom the Spurs selected second overall in the 2025 NBA Draft out of Rutgers.
“He played well today,” Dylan Harper said postgame, per Tom Osborn of the San Antonio Express News. “Just the way he kind of inserts himself. I think that just moving forward, the more opportunities he gets, the better he’s going to look.”
During the offseason, the Celtics reunited with Harper, signing him to an Exhibit 10 contract in August before the start of preseason. In his limited 10.6 minutes across three appearances, Harper shot 40.3 percent from the floor and 42.9 percent from three. Boston elected to keep him, converting his contract to a two-way deal for his second stint with the organization.
Following the preseason, the Celtics assigned Harper to their G League affiliate in Maine. He continued to develop there under head coach Phil Pressey, averaging 26.9 points, five rebounds, and four assists in 30.9 minutes per game. Harper logged eight appearances, shooting 49.7 percent from the floor, including 40.2 percent from three on 10.9 attempts per game. On February 4, Boston started Harper against the Houston Rockets, giving him his first career NBA start. He scored a then-career-high 11 points with nine rebounds and three assists in a 114-93 win, taking his first major step with the team.
Five weeks later in San Antonio, Harper’s work with the Celtics’ development staff paid off once more.
Mazzulla assured everyone before the season that opportunities would be handed out — and he’s kept his word. Everyone from Jordan Walsh to Hugo González to Luka Garza, and even Josh Minott before his trade to the Brooklyn Nets, has gotten their chance. The hours logged behind the scenes in practices and pregame sessions with the coaching staff have prepared players like Harper for their moments of action — even, and especially, when those moments come unexpectedly, as was the case in San Antonio.
Harper has already surpassed his total NBA appearances over his previous three years with the Pistons and Raptors, with 19 logged this season.
Based on Harper’s rise to the occasion in San Antonio and the reputation Mazzulla’s development staff has built over the past few years, the Celtics could have their next project in the works, ready to contribute in Boston in the near future.
