The Gonzaga Bulldogs are a clear betting favorite to win the 2021 NCAA men's basketball tournament, as Mark Few's undefeated group tries to pull off college basketball's first undefeated season since the Indiana Hoosiers in 1975-76. The Zags are also expected to own the Tournament Challenge consensus when ESPN's audience has taken on the exercise to fill out a March Madness bracket -- or several brackets. But Gonzaga, which has reached the national championship game only once in its history -- and lost -- still has its naysayers.