Watch NCAA Tournament First Four online live with March Madness on Demand

The NCAA Tournament is here and if you're looking to watch Tuesday night's First Four games online, then NCAA.com's March Madness on Demand is the place to do it. The action will tip off at 6:40 p.m. ET with a showdown between the North Carolina A&T Aggies and Liberty Flames, followed by a 9:10 p.m. ET tip between the Saint Mary's Gaels and Middle Tennessee State Blue Raiders.

In the first game of the slate, North Carolina A&T and Liberty will do battle as No. 16 seeds in the Midwest, with each hoping to notch a victory and earn a date with No. 1 seed Louisville on Thursday. The key to this match-up could come down to North Carolina A&T's ability to slow down Liberty guard John Caleb Sanders, who averaged over 14 points per game during the regular season. Sanders is coming off a huge 27-point performance in the Big South Championship Game last week.

For the Gaels to notch a victory, the key could be the play of guard Matthew Dellavedova. The senior from Australia averaged just under 16 points per game this season, but was held to just two in a West Coast Conference Tournament championship loss to Gonzaga.