It's down to two undefeated teams in college basketball. Seems like just days ago their were five or six, then all of a sudden—BAM—the favorites fell. Texas and Kentucky are the last two teams standing. Which one has a better chance of going undefeated?
Using the game-rating comparison system, we'll map out each game's %, and multiply them through to find the percentage chance that the system yields. Adding the percentages gives number of expected wins.
First, the #1 Texas Longhorns, currently 15-0:
Date Opponent % to win
Wed, Jan 13 @ Iowa St. 81%
Sat, Jan 16 Texas A&M 91%
Mon, Jan 18 @ Kansas St. 54%
Sat, Jan 23 @ Connecticut 68%
Wed, Jan 27 Texas Tech 92%
Sat, Jan 30 Baylor 84%
Mon, Feb 1 @ Oklahoma St. 76%
Sat, Feb 6 @ Oklahoma 87%
Mon, Feb 8 Kansas 54%
Sat, Feb 13 Nebraska 94%
Wed, Feb 17 @ Missouri 53%
Sat, Feb 20 @ Texas Tech 82%
Wed, Feb 24 Oklahoma St. 88%
Sat, Feb 27 @ Texas A&M 78%
Mon, Mar 1 Oklahoma 95%
Sat, Mar 6 Baylor 84%
By Favorites: 31-0
By Cumulative Projection: 28-3
% chance to go 31-0: 1.67%
From this we see Texas should be favored in every upcoming game, even against Kansas and on the road against Kansas State, though just barely. But while they're favored to go 31-0, they're projected to go 28-3, with just a 1.67% chance of actually winning the rest of their games. For comparison's sake, Kenpom.com has Texas the underdog in two games (@Kansas State, @Missouri), but projects the same 28-3 and gives the Longhorns a 1.39% chance of going unbeaten.
Now Kentucky, a surprising 17-0 even though they were our #1 pick pre-season.
Date Opponent % to win
Sat, Jan 16 @ Auburn 82%
Sat, Jan 23 Arkansas 91%
Tue, Jan 26 @ S. Carolina 65%
Sat, Jan 30 Vanderbilt 62%
Tue, Feb 2 Mississippi 68%
Sat, Feb 6 @ LSU 84%
Tue, Feb 9 Alabama 87%
Sat, Feb 13 Tennessee 57%
Tue, Feb 16 @ Miss. St. 46%
Sat, Feb 20 @ Vanderbilt 46%
Thu, Feb 25 S. Carolina 84%
Sat, Feb 27 @ Tennessee 37%
Wed, Mar 3 @ Georgia 80%
Sun, Mar 7 Florida 78%
By Favorites: 28-3
By Cumulative Projection: 27-4
% chance to go 31-0: 0.35%
Kentucky has just 14 games left to Texas' 16, but they'll be underdogs in three games according to this system, and are projected to have four losses. Worse, the odds of the team going undefeated are only 0.35%, about 1 in 300. Kenpom.com agrees, with Kentucky as underdogs in the same three games, a cumulative projection of 27-4, but a more-generous 0.62% chance of winning all 31 (in other words, a 1 in 150 chance).
What Kentucky has going for it is they're getting better by the day. Though Texas is better right now, Kentucky is closing the gap. It's remarkable that they've made it undefeated this far, so if either team is going to do it I'd take the Wildcats.
But no team has gone undefeated in the regular season since St. Joe's in 2004, and no team has entered the NCAA tournament undefeated since UNLV in 1991. What used to be a common occurrence became a rarity after the '70s, so it's no surprise that the odds of both of these teams doing it is something like 1 in 17,000.