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Chad Finn

Celtics forward Grant Williams is a role player, but in Game 2 his role was being one of the stars

Grant Williams's defense made it a tough night for Bucks star Giannis Antetokounmpo.Barry Chin/Globe Staff

In a way that’s entirely endearing, Grant Williams sometimes comes across like he’s pretty sure he’s one of the Celtics’ stars.

He chimes in with instructions in the huddle. He nicknames himself “Batman,” a hilarious semi-serious transgression of ego that turned his teammates into a bunch of jokers at his expense. And when he’s really feeling good, he has no qualms about teeing up 3-pointers like an honorary East Coast Splash Brother.

Among NBA fans who are still learning about the particulars of the Celtics’ transformation this season into an authentic championship contender, Williams probably wouldn’t be one of the first six or seven players they identify as important to the turnaround. He probably wouldn’t even be the first Williams, with Rob Williams pogoing his way into national consciousness this season.

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But Celtics fans — like the crew at TD Garden Tuesday night wearing orange shirts that spelled out GRANT in black lettering — know, and they’ve known for a couple of months now. Grant Williams’s charming, goofy confidence also happens to be wholly rational.

On most nights, he’s a superb role player, a character actor on a team that keeps hinting that the movie of their season might just have a Hollywood ending.

And on other nights … well, on other nights, let’s just say Williams knows how to steal the spotlight, and more than a few scenes, with what can look an awful lot like a star turn.

There’s no other way to say it without understating it: Williams was a star of the Celtics’ 109-86 wire-to-wire victory over the Bucks Tuesday night that evened these two tough, similar teams’ Eastern Conference semifinal series at a game apiece.

Grant Williams scored a career-high 21 points, draining 6 of 9 3-point attempts.Barry Chin/Globe Staff

Jaylen Brown, coming off an abysmal performance (four field goals, seven turnovers) in the Game 1 loss, was a man on a mission Tuesday night, scoring 17 points in the first quarter and 25 of his final total of 30 in the first half. Jayson Tatum finished with 29 points, with many of his buckets, including a clock-beating 3-pointer with a little more than four minutes left, coming down the stretch.

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And their third-leading scorer? Williams, of course, who drilled six 3-pointers on nine attempts en route to a career-high 21 points. He was right in the middle of the Celtics’ offensive onslaught to start the game, hitting a three to put them up, 15-3, then drilling another two minutes later to build the lead to 23-8.

Among his other offensive highlights: a crafty drive-and-kick to Brown for a three that put the Celtics up 25 points (65-40) heading into halftime, and an empty-the-benches dagger three with just less than two minutes left that put the Celtics up 21 (107-86).

As stellar as his offensive performance was, Williams’s most impressive contribution undeniably came on the defensive end.

Pretty much the only surefire way to stop Bucks superstar Giannis Antetokounmpo would be to construct a Green Monster-sized wall in front of the basket. Since the Bull Gang at the Garden probably wouldn’t sign off on such a strategy, Ime Udoka and the Celtics coaching staff had to concoct a conventional way of containing the best player in the world and a competitor admirable in his relentlessness.

Tuesday night, that plan included a strong dose of Williams, emphasis on strong. Williams is listed at 6 feet 6 inches, which is at least 5 inches shorter than Antetokounmpo, but per basketball-reference.com he’s only 6 pounds lighter (236 to Giannis’s 242). Williams’s strength and ability to withstand Antetokounmpo’s thundering attacks on the hoop were central to the Celtics’ defensive plan, which also included the usual sturdy contributions of Al Horford.

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Williams’s contributions on Antetokounmpo were huge, said Udoka.

“We talked about guarding him a little bit [better],” said the coach. “We feel like we have the defensive guys to do it. Obviously he came out extra aggressive in the second half, but he scored 28 on 27 shots. We were defending well initially, and Grant’s a big part of that.

“His versatility, he’s like a mini-Al out there. We ask him to do the same things.”

Williams bumped and pestered Antetokounmpo into missing his first six shots as the Celtics seized that early big lead. By halftime, Giannis was just 2 for 12 from the field, for 5 points. It was hardly a surprise when he awakened in the second half, scoring 23 points, including the Bucks’ first 8 as they scrambled to make a game of it. He’s such a special player that you have to assume the onslaught of points is coming at some point.

But Williams, just as he did against the Nets’ Kevin Durant in the first round, continued making Antetokounmpo earn every inch of space on the parquet, even as Giannis treated him like his own personal crash-test dummy. The most egregious collision occurred with a little less than six minutes to play in the third quarter, when Antetokounmpo was called for an offensive foul after inadvertently elbowing Williams in the jaw.

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Grant Williams (right) drew an offensive foul the hard way against Giannis Antetokounmpo. Barry Chin/Globe Staff

“Giannis can’t get by him in the halfcourt, and he can’t get through him in the halfcourt," marveled Stan Van Gundy on the TNT broadcast. At one point during the broadcast, Van Gundy suggested Williams may someday be a Defensive Player of the Year candidate. I had to rewind it to make sure he didn’t mean Rob Williams.

The Celtics, of course, were playing without the current Defensive Player of the Year, Marcus Smart, who was out with a quadriceps contusion. Yet in Smart’s absence, the Celtics held the Bucks to 86 points and didn’t allow the defending champions to create much suspense.

From the opening tip to the final buzzer, Grant Williams was a major reason for that. Yeah, he’s usually a role player. Tuesday night, that role just happened to be a starring one.


Chad Finn can be reached at chad.finn@globe.com. Follow him on Twitter @GlobeChadFinn.