NORMAN, OK – SEPTEMBER 1: Quarterback Jalen Hurts #1 of the Oklahoma Sooners warms up before the game against the Houston Cougars at Gaylord Family Oklahoma Memorial Stadium on September 1, 2019 in Norman, Oklahoma. The Sooners defeated the Cougars 49-31. (Photo by Brett Deering/Getty Images)The Heisman Trophy race is already shaping up as we head into Week 5 of the college football season. Several quarterbacks appear to be vying for the award as of now.This century, the Heisman has basically turned into an award for the best quarterback in the country. In fact, since 2000, Derrick Henry, Mark Ingram and Reggie Bush are the only non-QBs to take home the trophy, even if the NCAA now swears Bush never won it.Oklahoma quarterback Jalen Hurts and his former teammate, Alabama quarterback Tua Tagovailoa, look like the two favorites right now. Not surprisingly, they hold down the top two posts in the latest ESPN Heisman Trophy poll.ESPN’s poll consists of 10 voters with five votes each. Their ballots are then tallied using a point system: five points for first-place votes, four points for second-place votes, three points for third-place votes, two points for fourth-place votes and one point for fifth-place votes. Here’s ESPN’s updated Heisman Trophy top five ranking through the first four weeks:Jalen Hurts, Oklahoma QBTua Tagovailoa, Alabama QBJoe Burrow, LSU QBJonathan Taylor, Wisconsin RBJustin Fields, Ohio State QBYou can view ESPN’s full poll here.The only change in the top five from last week was Taylor flipping spots with Fields. That has more to do with Taylor’s impressive performance against Michigan than anything Fields didn’t do.Things can always change, but it figures that the Heisman winner will be one of these five young men. They each have a little more than two months to prove their case.