I’ve only been searching for a couple of minutes, but I’ve found what seems to be the best place to watch the NCAA (March Madness) Tournament online.
Watch all the games live here >> https://www.ncaa.com/
This looks like an NCAA site that is sponsored by CBSSports.com, and you’ll have to watch a 10 second commercial each time you click to watch a new game, but well worth it if you want to watch all of the NCAA Tournament “March Madness” games live online!