Pavel Zacha scored 2:49 into overtime and the Boston Bruins beat the Philadelphia Flyers 4-3 on Saturday to secure their fourth straight win.

Boston’s Brad Marchand equalized with 5:22 minutes left in regulation time. Trent Frederic scored the other two goals for Boston, making it 7-2 since interim coach Joe Sacco took over for fired coach Jim Montgomery.

Zacha scored the winning goal after Boston goaltender Jeremy Swayman stopped Joel Farabee’s breakaway seconds earlier.

Rookie Matvei Michkov scored two first-period goals in Philadelphia’s second straight loss. Cam York also scored a goal and Travis Sanheim had two assists.

After a frustrating loss to Florida in which the Flyers conceded seven goals and tied their highest goal of the season, the Flyers blew a lead in the third period for the second consecutive game.

Michkov scored a power play goal at 7:24 when he hit a shot from the right circle after a short tip pass from Sean Couturier. His second shot came with a deflected shot on the edge of the goal area.

Flyer: With nine goals and 22 points, Michkov led all rookies in scoring entering the day and had three assists in his final game on Thursday.

Bruins: Sacco used star winger David Pastrnak up front along with Brad Marchand for the second straight game and the first time this season after Marchand scored two goals in Boston’s last game.

Marchand rushed to a puck deep in the offensive zone, got around Tyson Foerster and slipped the puck between Aleksei Kolosov’s pads for the tying goal.

The Bruins won the season series 2-1.

The Flyers have a quick turnaround and host Utah on Sunday, and the Bruins are off until Tuesday when they start a five-game series in Winnipeg.