Jayson Tatum believes his Boston Celtics team showed their toughness as they claimed a 104-84 Game 3 win over the Miami Heat on Saturday.

As the top seed in the Eastern Conference, Boston eased to victory in the opening match of the first-round series. However, the eighth-seed Heat hit back in Game 2, taking a 111-101 triumph to level the series.

Game 3 belonged to the Celtics, though, with a strong defensive display and a big performance from Tatum, who finished with 22 points and 11 rebounds, allowing Boston to once again get their noses in front ahead of Game 4.

In Tatum's view, the Celtics were able to match their ability with a strong mindset in Game 3 to help them regain control of the series.

"Everybody knows how talented we are," Tatum told reporters. "But can we be the tougher, harder-playing team?"

"If we can combine that with the talent, it's going to be hard to beat us.

"Can we start off every game, essentially, punching first instead of reacting? That's a test we have to be up for every single night."

The Heat hit 23 3-pointers in their Game 2 victory, but the Celtics' defensive display was a big improvement on Saturday, limiting the Heat to just 84 points.

Miami head coach Erik Spoelstra acknowledged the Celtics' much-improved performance in Game 3, though he still believes his team has the ability to haul themselves back into the series again.

"They were the more physical team," Spoelstra explained. "They bodied us [and] bullied us.

"We have enough to get the job done. We know we have to play hard, and we also have to play well."