Styles make fights, and with the Nets tipping off their first-round playoff series Saturday against visiting Boston, The Post’s Brian Lewis breaks down the matchups that will decide what kind of fight this is going to be:

Joe Harris led the NBA in 3-point shooting for the second time in three years, and Brooklyn’s 39.2 percent as a team was second-best in the league. Despite having elite defensive wings Jayson Tatum and Marcus Smart, Boston’s 3-point percentage defense is bottom 10 in the league, and the Nets have just has too many floor-spacers to stop. Edge: Nets

Brooklyn’s vulnerable 3-point defense was next-to-last in the NBA over the final 15 games. The Celtics are 10th in attempts and percentage made, and Kemba Walker hit three 3-pointers in the first three minutes of the second half in the play-in victory over Washington on Tuesday night. But losing Jaylen Brown, out for the season following wrist surgery, hurts Boston’s defense. Edge: Celtics

Both teams are fair-to-middling on the boards. That’s not great news for the Celtics, who are limited offensively right now and are likely going to have to dominate Brooklyn on the glass to pull off an upset in this series. Edge: Even

Brooklyn is just eighth in free throws attempted, but that’s a misleading stat with the Nets’ Big 3 of Kevin Durant, James Harden and Kyrie Irving playing just eight games together the entire regular season. Durant is 12th in attempts per game, and anybody who’s ever watched Harden’s career knows he can turn a game into a parade to the charity stripe. Edge: Nets

Other than LaMarcus Aldridge’s all-too-brief stint in Brooklyn before his sudden retirement because of a heart condition, neither team has a legitimate post-up threat. The Big 3 get in the paint on isolation plays, pick-and-rolls and the like. Despite a lack of elite rim protection, Boston has allowed the fifth-fewest points in the paint. Edge: Even

Like most aspects of Brooklyn’s much-maligned defense, it’s vulnerable. But after ranking a horrible 28th in points in the paint allowed before the All-Star break, the Nets have improved to sixth in the second half of the season. Boston doesn’t have a great post threat, but Tatum and Walker can get into the lane. Edge: Even

The Nets rank in the top 10 in fast break points, while Boston’s top-10 transition defense rose to the challenge against Washington’s Russell Westbrook in the play-in round. Losing Brown hurts the Celtics on both ends, while the Nets’ transition defense — below average in the first half of the season — is top five in the last 15 games. Edge: Even

As usual, rotations will shrink in the playoffs. Boston is going to need center Tristan Thompson to be stellar (as he was against Washington), especially if Robert Williams III is ailing. The Nets’ crunch for minutes could be tough, but a bench led by Jeff Green, Nic Claxton, Landry Shamet and Bruce Brown has a decided advantage. Edge: Nets

Brad Stevens put on a clinic against Washington, limiting Westbrook’s passing lanes in transition, using bigger players like Tatum and Evan Fournier to keep him from the rim. Despite the flap over his praise of the Nets, he has a huge experience edge on rookie Steve Nash, who will lean on assistant coaches Mike D’Antoni and Jacque Vaughn. Edge: Celtics

The Nets’ Big 3 has only had 202 minutes sprinkled over eight games to build cohesion. But the Celtics had a whole season to build something and went just .500. With talents like Tatum (and Brown before he got hurt), it begs the question of exactly what’s been wrong in Boston? Edge: Nets