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The top six teams in the Associated Press Top 25 poll all lost Saturday, marking the first time in history that's ever happened on the same day. It started with Purdue losing at Michigan State. It ended with Gonzaga losing at Saint Mary's. It was the wildest and most entertaining day in what's been a wild and entertaining season.

If Arizona would've won at Colorado, Tommy Lloyd's Wildcats would've moved to No.1 in Sunday morning's updated CBS Sports Top 25 And 1 daily college basketball rankings. But they lost — as did Kansas, Auburn, Purdue, Kentucky and Texas Tech. So the only sensible thing to do is leave Mark Few's Zags in the top spot, despite the loss at Saint Mary's, because of a combination of their body of work and strong computer numbers. Gonzaga is 8-3 in Quadrant 1 with zero additional losses and ranked No. 1 in the NET, at KenPom.com, in BPI, Sagarin and at BartTorvik.com. If the NCAA Tournament started today, the Zaga would still be the No. 1 overall seed, according to CBS Sports Bracket Expert Jerry Palm.

Baylor is Sunday's biggest mover thanks to the Bears recording their national-best 11th Quadrant 1 win via a double-digit victory over Kansas. I admittedly got a little lower than most on the Bears in recent weeks when they went through a 3-3 stretch from Jan. 29 to Feb. 16 and lost Jonathan Tchamwa Tchatchoua for the season. But they've recovered nicely, added two Quadrant 1 victories over the past six days, and are back on track to be a No. 1 seed in the NCAA Tournament for the second consecutive year.

FYI: Saint Mary's move from 22nd to 17th in the Top 25 And 1 after its double-digit win over Gonzaga resulted in Ohio State, Houston, USC, UCLA and Illinois being pushed down one spot each through no fault of their own. The Gaels will take a 9-6 record in the first two quadrants into the West Coast Conference Tournament.

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Top 25 And 1 rankings

Biggest Movers
9 Baylor
5 Purdue
Rk
Teams
 
Chg
Rcrd
1 Gonzaga Gonzaga is 10-3 in the first two quadrants with wins over Texas Tech, Texas, Saint Mary's and UCLA. The Zags are the No. 1 seed in the West Coast Conference Tournament. -- 28-4
2 Baylor Baylor is 16-5 in the first two quadrants and in possession of a national-best 11 Quadrant 1 wins. The Bears' next game is Monday at Texas. 9 27-7
3 Arizona Arizona is 13-3 in the first two quadrants with wins over USC, UCLA and Illinois. The Wildcats' next game is Tuesday at USC. 1 33-4
4 Kansas Kansas is 16-5 in the first two quadrants with four of the five losses coming in Quadrant 1. The Jayhawks' next game is Tuesday at TCU. 1 34-6
5 Auburn Auburn is 14-4 in the first two quadrants with all four losses falling in Quadrant 1. The Tigers' next game is Wednesday at Mississippi State. 1 28-6
6 Duke Duke is 11-3 in the first two quadrants with an additional loss to Virginia falling in Quadrant 3. The Blue Devils' next game is Tuesday at Pitt. -- 32-7
7 Providence Providence is 14-3 in the first two quadrants and Big East regular-season champions for the first time in history. The Friars' next game is Tuesday at Villanova. 1 27-6
8 Kentucky Kentucky is 12-6 in the first two quadrants with all six losses coming in Quadrant 1 games away from home. The Wildcats' next game is Saturday at Arkansas. 1 26-8
9 Wisconsin Wisconsin is 15-4 in the first two quadrants with an additional loss to Rutgers falling in Quadrant 3. The Badgers' next game is Tuesday against Purdue. -- 25-8
10 Purdue Purdue is 11-5 in the first two quadrants with four of the five losses coming in Quadrant 1. The Boilermakers' next game is Tuesday at Wisconsin. 5 29-8
11 Texas Tech Texas Tech is 13-7 in the first two quadrants with all seven losses coming in Quadrant 1. The Red Raiders' next game is Monday against Kansas State. 1 27-10
12 Villanova Villanova is 12-7 in the first two quadrants with wins over Providence and Tennessee. The Wildcats' next game is Tuesday against Providence. -- 30-8
13 Tennessee Tennessee is 12-7 in the first two quadrants with wins over Arizona, Auburn and Kentucky. The Vols' next game is Tuesday at Georgia. -- 27-8
14 Arkansas Arkansas is 11-5 in the first two quadrants with an additional loss to Vanderbilt falling in Quadrant 3. The Razorbacks' next game is Wednesday against LSU. -- 28-9
15 UConn UConn is 12-7 in the first two quadrants with victories over Auburn and Marquette. The Huskies' next game is Sunday at Georgetown. -- 23-10
16 Texas Texas is 11-8 in the first two quadrants with wins over Kansas and Tennessee. The Longhorns' next game is Monday against Baylor. -- 22-12
17 Saint Mary's Saint Mary's is 9-6 in the first two quadrants with a win over Gonzaga and all six losses coming in Quadrant 1. The Gaels are the No. 2 seed in the West Coast Conference Tournament. 5 26-8
18 Ohio St. Ohio State is 9-7 in the first two quadrants with five of the seven losses coming in Quadrant 1. The Buckeyes' next game is Sunday at Maryland. 1 20-12
19 Houston Houston is 7-4 in the first two quadrants but in possession of zero Quadrant 1 wins. The Cougars' next game is Sunday against SMU. 1 32-6
20 USC USC is 10-3 in the first two quadrants with an additional loss to Stanford falling in Quadrant 3. The Trojans' next game is Tuesday against Arizona. 1 26-8
21 UCLA UCLA is 9-6 in the first two quadrants with wins over Arizona and Villanova. The Bruins' next game is Monday at Washington. 1 27-8
22 Illinois Illinois is 10-8 in the first two quadrants but just 2-3 in its past five games. The Illini's next game is Sunday at Michigan. 1 23-10
23 Murray St. Murray State is 5-1 in the first two quadrants with an additional loss to East Tennessee State falling in Quadrant 3. The Racers are the No. 1 seed in the Ohio Valley Conference Tournament. -- 31-3
24 Alabama Alabama is 13-8 in the first two quadrants with two additional losses to Georgia and Missouri falling in Quadrant 3. The Crimson Tide's next game is Wednesday against Texas A&M. -- 19-14
25 Iowa St. Iowa State is 11-9 in the first two quadrants with wins over Texas Tech and Texas. The Cyclones' next game is Wednesday against Oklahoma State. -- 22-13
26 Iowa Iowa is 7-8 in the first two quadrants with wins over Ohio State and Michigan State. The Hawkeyes' next game is Monday against Northwestern. -- 26-10