NCAA Tournament 2026 Betting Percentages: Sweet 16 Trends, Line Movement, & Sharp Money

NCAAB Line Movement for March Madness

Beyond tracking Sweet 16 March Madness betting percentages, reading line movement is a crucial tool for informed bettors. Oddsmakers released odds for the Sweet 16 shortly after the Round of 32 concluded, and those numbers have shifted as wagers have come in.

Small adjustments usually signal that there hasn’t been enough money on either side to move the line much. Meanwhile, notable shifts often reflect large wagers that force oddsmakers to react. Sharp bettors look to attack soft opening numbers, and their early action is frequently what drives those bigger moves.

Here, I’ve outlined the most notable Sweet 16 NCAA Tournament line movement (March 22 to 25) on the board at Lucky Rebel:

• • Michigan State Spartans -1.5 to +2 vs. UConn Huskies
  • Nebraska Cornhuskers -3 to -1.5 vs. Iowa Hawkeyes
  • Arizona Wildcats -9.5 to -8 vs. Arkansas
  • Houston Cougars -2.5 to -3.5 vs. Illinois Fighting Illini
  • Duke Blue Devils -7 to -6.5 vs. St. John’s Red Storm
  • Michigan Wolverines -10.5 to -10 vs. Alabama Crimson Tide
  • Purdue Boilermakers -8 to -7.5 vs. Texas Longhorns

The Michigan State Spartans–Connecticut Huskies matchup has seen the largest line move of the Sweet 16. Tom Izzo’s Spartans opened as 1.5-point favorites, but they are now 2-point underdogs.

The money is fairly split against the spread, which suggests the move was likely triggered by early sharp bettors rather than lopsided public action. In response, oddsmakers removed Michigan State as the favorite and flipped the line to favor UConn.

Coach Dan Hurley on his Sweet 16 matchup with Tom Izzo:

"Talk about an honor to share the sideline with one of the greatest coaches.

He's always been my most respected coach that I've tried to model myself after at the college level." pic.twitter.com/MSCL3swVaj

— CBS Sports (@CBSSports) March 23, 2026

A similar dynamic appears in the Nebraska Cornhuskers–Iowa Hawkeyes game. Despite public money backing Nebraska, the point spread has moved toward Iowa. The Cornhuskers opened -3 but dropped to -1.5. Nebraska has drawn 68% of the betting handle and 63% of all wagers, yet the line is moving in Iowa’s direction.

Another significant adjustment has come in the Arizona Wildcats–Arkansas Razorbacks matchup. Early money has leaned toward Arkansas, which has received 59% of the handle and 60% of tickets. Arizona opened as a 9.5-point favorite, dipped to -7.5, and currently sits at -8.

Beyond those three games, early public money has pushed the numbers slightly in favor of Houston, St. John’s, Alabama, and Texas relative to the opening lines.

Interestingly, the Tennessee Volunteers have attracted 64% of the money, but their line hasn’t budged off Iowa State -4. That contrast, heavy support on Tennessee with no movement, stands out alongside a few other notable games.

So, what’s going on here?

There are a few games where the Sweet 16 line movement doesn’t align with the early betting patterns:

That includes Michigan State, which has flipped to an underdog despite bettors being split on the matchup. Purdue is also notable, the Boilermakers are drawing nearly 70% of the handle, yet the line has moved from -8 to -7.5. On top of that, Nebraska has been bet down to -1.5 after opening as a 3-point favorite, even though 68% of the money and 63% of tickets are on the Cornhuskers.

If you want to take it a step further, look at Tennessee. The line has held steady at +4, despite 64% of the handle coming in on the Volunteers.

Put it all together, and this looks like a classic case of sharp money quietly shaping the market. A relatively small group of respected, higher-stakes bettors backing the other side can outweigh a much larger pool of smaller public wagers.

There could also be a simpler explanation to keep in mind: the openers might have just been off. As sportsbooks update their models and factor in new information, they’ll move the number toward Illinois and the other opponents, even if the bulk of the money still appears to be landing on the favorites.

Still, odds move in the same direction as the money most of the time, but as these games showcase, not always.

The market could effectively be saying: despite the majority of bettors backing Michigan State, Purdue, Nebraska, and Tennessee, the most trusted or largest money believe their opponents should be priced higher, and our model agrees or is catching up.

Sharp vs. Square Betting March Madness

Sharp money on the NCAA Tournament refers to where the most knowledgeable and successful bettors are placing their wagers, often including professionals.

On the other hand, square bettors are typically recreational. They tend to rely on gut feelings or simply choose the team they perceive as “better,” without doing meaningful research or analysis.

There isn’t a single, definitive signal that shows exactly where the sharp money is going, but there are several useful indicators. Reading NCAA Tournament line movement is key, as in the Illinois example above, as well as tracking how public money is distributed.

One trend to watch is when the betting handle (the total amount of money wagered) is significantly higher than the percentage of bets placed on that side.

When this happens, it can suggest that larger, potentially sharper bettors are backing that team. I’ve highlighted the games that fit this criterion below:

While this isn’t a cheat code for making free money, it does show where the big bets are going in the public square. The vast majority of wagers come from small, recreational bettors, so they dominate the total percentage of bets.

When the handle is significantly higher than the percentage of bets, it’s generally understood that large, sharp wagers are likely causing the gap. Understand, however, that large wagers don’t always translate to sharp bets, so it’s important to research other variables, including the latest Sweet 16 betting trends and line movements.