Taylor Raddysh scored three goals and the Chicago Blackhawks beat Boston 6-3 on Tuesday night, handing the NHL-leading Bruins a second straight regulation loss for the first time this season.

Raddysh's first career hat trick gave him 20 goals for the season and six in his last four games. Chicago ended a three-game slide (0-2-1).

Boris Katchouk scored a tiebreaking goal at 6:59 of the third period and added two assists for his first three-point game.

Joey Anderson had a goal and an assist, and MacKenzie Entwistle also scored for Chicago, which entered tied for last place in the Western Conference.

Never mind that Boston came in with a whopping 55 more points than the Blackhawks.

Hampus Lindholm had a goal and an assist after missing the Bruins' game at Detroit on Sunday with a swollen foot. Trent Frederic and Pavel Zacha also scored for Boston.

Bruins top scorer David Pastrnak missed on a penalty shot with 1:24 left.

The Bruins entered with a league-best 105 points. They became the fastest team in NHL history to reach 50 wins in a season by beating the Red Wings 3-2 in Boston on Saturday. But the Bruins lost 5-3 at Detroit on Sunday and are 1-3-0 in their last four on the heels of a 10-game winning streak that propelled them to a big lead in the Atlantic Division and Eastern Conference.

Blackhawks goalie Petr Mrazek re-aggravated a groin injury that has bothered him the past two seasons and was replaced by Alex Stalock at 8:48 of the second period.

Mrazek, who stopped all 16 shots he faced, skated to the dressing room abruptly after dropping to the ice to make a couple of close-in saves on Frederic to keep Chicago ahead 1-0. About a minute earlier, Dmitry Orlov’s slap shot struck Mrazek in the mask.

Stalock stopped 23 of 26 shots in relief.

Linus Ullmark made 23 saves for Boston.

The Blackhawks are at Nashville on Thursday to start a five-game trip.