A four-goal first period gave the Bruins enough to take a 6-3 win over the Maple Leafs on Saturday night at TD Garden. The B’s, ahead 2-0 in the best-of-7 series, were led by David Pastrnak’s six-point night.

Mike Loftus The Patriot Ledger

BOSTON - Game 2 of the Bruins’ best-of-seven first round playoff series against the Maple Leafs started an hour later than usual on Saturday night, to accommodate network TV in the United States and Canada.

 The Bruins weren’t late at all. They had all they needed after a four-goal first period, and took a 2-0 lead in the series with a 6-3 victory at TD Garden. David Pastrnak led the attack with six points -- three goals and three assists -- while linemates Brad Marchand and Patrice Bergeron collected four assists apiece.

 Game 3 is on Monday night at Toronto’s Air Canada Centre, with Game 4 there on Thursday night.

 The Bruins, who had pulled away from the Leafs in the second half of Game 1 for a 5-1 victory, played without winger Tommy Wingels, who sustained an upper body injury in Game 1 on a hit by Nazem Kadri that resulted in the Leafs forward receiving a three-game suspension from the NHL Department of Player Safety. To compensate, the B’s moved third-line left wing Danton Heinen to Wingels’ spot at right wing on the fourth line, and gave rookie Ryan Donato his first playoff game in Heinen’s spot.

 The changes didn’t stop the Bruins from dominating the first period, and chasing Leafs’ goalie Frederik Andersen after just 12 minutes, 13 seconds. Andersen, who surrendered five goals on 40 shots in Game 1, stopped only two of five shots before Curtis McElhinney relieved him. McElhinney gave up one goal on three shots before intermission.

 After scoring on three of six power-play opportunities in Game 1, the Bruins went 2 for 2 in the first period. Both times, the Leafs took unnecessary penalties.

 With the B’s already ahead 1-0 on David Pastrnak’s second goal of the series after just 5:26, the Leafs were caught with too many men on the ice at 8:24. The visitors nearly shifted the momentum in their favor when Kasperi Kapanen turned miscommunication between Brad Marchand and Torey Krug into a breakaway. Kapanen’s bid hit the post behind Tuukka Rask (, though, and the Bruins doubled their lead shortly thereafter.

 As the Bruins’ first power play group began to leave the ice in the midst of an offensive zone possession, rookie Jake DeBrusk jumped on and made it from the bench to the crease to deflect Krug’s pass off Andersen at 9:46. Krug and Patrice Bergeron both picked up their second assists of the night.

 Defenseman Kevan Miller made it 3-0, and ended Andersen’s night, with his first goal in 19 career playoff games at 12:13, spinning out of the left corner and watching his pass for Pastrnak get deflected past Andersen by Leafs defenseman Nikita Zaitsev.

 Ron Hainsey’s attack on Tim Schaller after the Bruins forward finished a check that took down Mitch Marner gave the Bruins their second power play of the period at 14:49. Just 11 seconds later, Rick Nash had his first post-season goal as a Bruin, popping a backhander home after Krug fed Pastrnak for a shot from the point.

 Pastrnak (goal, two assists) and Krug (three helpers) both finished the period with three assists for the Bruins. Pastrak added a fourth with an assist on David Krejci’s second-period goal at 3:46, which came just 2:24 after Marner scored for the Leafs. Tyler Bozak trimmed the Bruins’ lead to 5-2 at 9:02.