Upset fans, don't fret.

While the underdogs may not have had great success during the first two days of the NCAA Tournament and might not have much more as the first weekend ends, Michigan coach John Beilein believes the good old days will soon put the madness back in March.

“I think if anything this year, I guess that wave of upsets is probably over right now or it still could happen, I guess. But I think it’s more of an aberration than anything,” he said Saturday in Indianapolis. “I think, if anything, it will go the other way because of the attrition to the pros, because of transfers. You take a whole bunch of junior and seniors who are mid-major players and play a bunch of freshmen who have people calling them about the NBA the next day and they’re in the NCAA Tournament, it’s really hard.”

That, of course, was one reason the tourney has become so popular over the past four decades.

Even today the buzzer-beating shot Bryce Drew made for Valparaiso remains one of the tourney’s signature moments.

Picking upsets has become a tricky proposition, though. Eleventh-seeded Xavier spent a good bit of the season ranked in the Top 25, and 12th-seeded Middle Tennessee, the lowest seed left after Round 1, was picked by more than 40 percent of those in ESPN’s Bracket Challenge.

But Beiliein, whose seventh-seeded Wolverines will try to upset second-seeded Louisville on Sunday in the Midwest Regional, believes the days of chalk-filled brackets won’t last.

“You stay tuned,” he said. “This March Madness will always be March Madness. Some years will just be madder than others.”