There has been one constant in college hockey this season: UMD winning.
The Minnesota-Duluth Bulldogs have solidified themselves as the best team in the nation.
Outside of Duluth, a handful of teams have been battling to maintain spots in the top five of the power rankings, but have yet to solidify themselves as the nation's second-best team.
Boston University might be on their way to solidifying themselves as No. 2 in the country; the Terriers are 12-2-1 in their last 15 games. Let's look at college hockey's top 15:
First Five Out: Denver, North Dakota, Nebraska-Omaha, Miami and Colgate
Series of the Week: Wisconsin @ North Dakota, No. 14 Maine @ No. 2 Boston University, Michigan State @ No. 13 Ferris State and Michigan Tech @ No. 1 Minnesota-Duluth.
15. Western Michigan (12-9-5)
The Broncos were swept by Miami last weekend. The Redhawks outscored Western Michigan 7-1. WMU faces Bowling Green (7-14-5) this weekend.
14. Maine (12-8-3)
The Black Bears are 10-2-2 in their last 14 games. Maine faces No. 2 Boston University this weekend.
13. Ferris State (15-8-3)
The Bulldogs took five points from Ohio State last weekend. FSU faces Michigan State (13-9-4) this weekend.
12. Michigan (15-9-4)
The Wolverines are coming off of a split with Notre Dame, ending Michigan's nine-game unbeaten streak. The Wolverines are off this week.
11. Massachusetts-Lowell (14-6-0)
Lowell clobbered Northeastern, outscoring the Huskies 7-2. The Riverhawks have games against Providence (9-11-2) and Massachusetts (9-8-5) this weekend.
10. Ohio State (14-7-4)
The Buckeyes are 0-3-1 in their last four games. OSU faces Lake Superior State (13-11-4) this weekend.
9. Colorado College (14-9-1)
The Tigers are coming off of a split with the Gophers, each game decided by a 2-1 score. The Tigers are off this week.
8. Boston College (14-10-1)
The Eagles were swept by Maine last weekend. Maine notched 11 goals in the two games. BC is 1-3-0 in its last four games. The Eagles have a home-and-home with New Hampshire (9-12-2) this weekend.
7. Cornell (11-4-4)
Cornell is on a seven-game unbeaten streak. The Big Red face Colgate (12-9-3) this weekend.
6. Notre Dame (14-9-3)
The Irish are coming off of a split with Michigan. ND faces Alaska (8-12-4) this weekend in Fairbanks.
5. Minnesota (17-9-1)
The Gophers seemingly cannot win on Fridays; Minnesota is 2-7-0 on the last nine Fridays. The two wins came against Niagara (9-8-7) and Minnesota State (8-17-1).
4. Union (13-6-6)
Union boasts the nation's best team defense, allowing 1.84 goals per game.
3. Merrimack (13-5-5)
The Warriors have the second-best team defense in the nation, allowing just two goals per game.
2. Boston University (15-6-1)
The Terriers look to solidify themselves as the nation's No. 2 team when they face No. 14 Maine this weekend.
1. Minnesota-Duluth (17-4-3)
The Bulldogs swept Alabama-Huntsville in a couple of one-goal games. In those games, Duluth recorded 101 shots on goal, finding the net on only six of those shots. The Bulldogs face Michigan Tech (11-12-1) this weekend.