The top four teams all lost this week, so who's the new No. 1?

If voters in the AP Top 25 thought determining the top five was difficult last week, they probably aren't going to enjoy this week's process any better.

Kansas, Texas, Pittsburgh and Ohio State all lost on the road, leaving a huge void at the top of the poll and seven teams who can make a case that they're most worthy of filling it.

If I had a vote I'd likely put the Buckeyes No. 1 in spite of their loss at Purdue because they have the best season-long resume, though I can definitely see the argument for several other teams, especially Pittsburgh. The Panthers have slightly better wins than Ohio State, but the Buckeyes' lone two losses of the season came on the road against two teams who have yet to lose at home this season.

Here's an assessment of each of their résumé's thus far and why all seven should or should not be No. 1. And for those who argue that the polls are irrelevant, you're right but don't forget these are also the seven teams vying for No. 1 seeds in the NCAA tournament next month as well.

1. Ohio State (25-2, 12-2, RPI: 4, SOS: 33)

Quality wins: at Florida, at Florida State, Purdue, at Illinois, at Minnesota, vs. Minnesota, Michigan State

Losses: at Wisconsin, at Purdue

Why they should be No. 1: Ohio State's two losses are on the road against teams who are a combined 29-0 at home.

Why they shouldn't: Those two losses came in the Buckeyes' past three games.

2. Pittsburgh (24-3, 12-2, RPI: 8, SOS: 25)

Quality wins: Texas, Connecticut, at Georgetown, Syracuse, West Virginia, Cincinnati, at West Virginia, at Villanova

Losses: Tennessee, Notre Dame, at St. John's

Why they should be No. 1: Pittsburgh leads the nation's toughest conference and has beaten five top 20 teams including Texas on a neutral floor.

Why they shouldn't: Two of the Panthers' three losses came against teams that are not currently ranked and the other was at home.

3. Texas (23-4, 11-1, RPI: 7, SOS: 16)

Quality wins: Illinois, North Carolina, at Michigan State, Texas A&M, at Kansas, Missouri, at Texas A&M, Baylor

Losses: Pittsburgh, at USC, Connecticut, at Nebraska

Why they should be No. 1: They beat Kansas in Lawrence and had dominated the Big 12 prior to Saturday's loss at Nebraska.

Why they shouldn't: Four losses are more than any other team in contention for the No. 1 ranking. Plus a 17-point loss at USC is an eyesore.

4. Kansas (25-2, 10-2, RPI: 1, SOS: 10)

Quality wins: Arizona, UCLA, Memphis, Colorado State, Nebraska, at Baylor, Kansas State, at Nebraska, Missouri

Losses: Texas, at Kansas State

Why they should be No. 1: Kansas has only two losses, one of which came on the heels of Thomas Robinson's mother's death.

Why they shouldn't: Arizona, Missouri and UCLA are the only certain NCAA tourney teams Kansas has beaten -- and two of those wins were in the opening weeks of the season.

5. BYU (25-2, 11-1, RPI: 2, SOS: 21)

Quality wins: Utah State, Saint Mary's, Arizona, UTEP, at UNLV, at Colorado State, San Diego State, UNLV

Losses: UCLA, at New Mexico

Why they should be No. 1: Compare BYU's wins to the teams ranked ahead of it and you may be surprised to see that they stack up rather well against fellow two-loss teams Duke and Kansas.

Why they shouldn't: Their wins don't quite stack up with Ohio State or Pittsburgh.

6. Duke (24-2, 11-1, RPI: 6, SOS: 35)

Quality wins: Marquette, Kansas State, Michigan State, Butler, North Carolina

Losses: at Florida State, at St. John's

Why they should be No. 1: Assuming the Blue Devils defeat Georgia Tech on Sunday night, they'll be the only top five team that didn't lose this week.

Why they shouldn't: The come-from-behind home win over North Carolina is Duke's lone victory of the season over a certain NCAA tournament team.

7. San Diego State (27-1, 12-1, RPI: 3, SOS: 33)

Quality wins: at Gonzaga, Wichita State, St. Mary's, UNLV, at Colorado State, at UNLV

Losses: at BYU

Why they should be No. 1: The Aztecs are the nation's lone one-loss team, they have more road/neutral wins than any team ranked ahead of them and their lone loss was to a top 10 team on the road.

Why they shouldn't: San Diego State doesn't have the marquee wins of a Pittsburgh, a Texas or an Ohio State.

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