TUSCALOOSA, AL – OCTOBER 26: Head coach Nick Saban of the Alabama Crimson Tide prepares to enter the field with his team prior to facing the Tennessee Volunteers at Bryant-Denny Stadium on October 26, 2013 in Tuscaloosa, Alabama. (Photo by Kevin C. Cox/Getty Images)Alabama has been one of the most-dominant teams in college football history so far this season. The Crimson Tide have looked unbeatable for much of the year.Is that actually the case, though? Is Alabama, barring an injury to star quarterback Tua Tagovailoa, actually unbeatable?Tim Tebow says no.The ESPN college football analyst appeared on SportsCenter this morning and listed three teams that have a chance of really challenging Alabama.Those three teams:ClemsonGeorgiaOhio StateGeorgia is obviously extremely familiar with Alabama, while Dabo Swinney and Urban Meyer know exactly what it takes to topple Nick Saban on a big stage.“One (team) is Georgia here in the SEC Championship. Kirby Smart knows how to game plan and we saw that last national championship. And also Clemson. With that defensive line if they’re able to face off in the Playoff, I think they can give them a game,” Tebow said.“But one team to watch out for – if Ohio State can make a run – Urban Meyer also give Nick Saban fits. That offense with Dwayne Haskins, that could be another big-time matchup for Alabama in the future.”No one is challenging Alabama today, though. The Crimson Tide are set to kick off against The Citadel at noon E.T.