Freshman Luke Mittelstadt scored two third-period goals in two-and-a-half minutes, and top-ranked Minnesota beat Boston University 6-2 on Thursday night in the opening game of the NCAA Frozen Four.

Mittelstadt gave Minnesota a 3-2 lead on a power play with 18:20 left in the third period, and his second came from the same spot at the left circle for his fifth goal of the season — and third in the NCAA tournament.

Logan Cooley added two empty-net goals to reach 22 on the season.

The five-time national champion Gophers (29-9-1) seek their first title since 2003 against Quinnipiac on Saturday. Minnesota has outscored its opponents 19-5 in the NCAA tournament.

Quinnipiac, meanwhile, got a two-goal game for the second time during the NCAA tournament from Jacob Quillan while Yaniv Perets posted 29 saves in a 5-2 win over Michigan on Thursday.

Quinnipiac (33-4-3), which set a program record for wins, advances to its third national title game in program history. The Bobcats seek their first title after losing in 2013 and ’16. Michigan (26-12-3) was seeking its 10th NCAA championship.