A good bounce back in Week 3 as our college football underdog picks finished 3-0 on these pages. Air Force won 30-23 at Colorado in overtime after the Buffaloes tied the game in the closing seconds of regulation. Pitt (+17.5) lost at Penn State but easily covered in a 17-10 defeat. But WTF was the Pitt coach thinking kicking (and missing) a field goal on 4th at 1 at the Penn State 1 yard line with five minutes remaining in the game trailing 17-10? Um, go for it, even after failing on three downs with 1st and goal at the 1 yard line.

There are three Top 25 match-ups on the Week 4 card, and we'll be adding one of the underdogs to our picks and analysis below. 

Shop lines at the leading online sportsbooks, and if you want to check out where the money is being bet on these games from a consensus of seven leading online sportsbooks including BookMaker and 5Dimes, then check out Sports Insight live college football odds and see the percentage of bets, most money and over/under money being wagered. 

Also, follow the bye week schedule each week and note which teams are rested and ready coming off a bye into Week 4. There are 15 teams that are playing on Sat., Sept. 21 that had a bye last week, including both Michigan and Wisconsin, who collide in Madison in a Big Ten battle and top-15 match-up. 

There were some notable underdogs that won along with the biggest upsets and Money line payoffs from Week 3. 

The Citadel +1500, won 27-24 in OT at Georgia Tech (+27.5)
Kansas +800, won 48-24 at Boston College (+20.5)
Arizona St +550, won 10-7 at Michigan St (+15.5)
Eastern Michigan +230, won 34-31 at Illinois (+7.5)
West Virginia +220, won 44-27 vs NC State (+7)  
Kansas St +220, won 31-24 at Mississippi St (+7)
Air Force +145, won 30-23 in OT at Colorado (+3.5)

Here is an early season update on good and bad ATS teams to start the season. 

Who is Cashing and Hot? 

Auburn, UCF, Kansas State, Kentucky, UL-Lafayette, Louisville, Oklahoma State, SMU and Texas A&M are all 3-0 ATS this season. Kansas State has covered their 3 games by the biggest margin at 53.5 combined points. 

Who's Not? 

Akron, FIU, Georgia Tech, Massachusetts, Miami, (OH), Texas State, UCLA and Virginia Tech are all 0-3 ATS. Akron, Massachusetts and Virginia Tech have all missed the mark badly, failing to cover the point spread by at least 40 points each through three games.

NCAA Underdog Selections for Saturday, Sept 21 

343 Michigan (+3.5) at Wisconsin - Wolverines Money Line +145
365 Appalachian State (+3) at North Carolina - Mountaineers Money Line +120
379 SMU (+9.5) at TCU - Mustangs Money Line +290

Michigan was a 5-point favorite over Wisconsin on the Game of the Year lines out of Las Vegas this summer. Now taking 3.5-points with the Wolverines, the handicappers conundrum is to determine if the Wolverines have dropped off that much following their 2-0 start with sloppy play, too many penalties and turnovers (5 lost fumbles) against inferior foes. Or is Wisconsin as good as advertised outscoring their first two opponents 110-0 and riding the momentum warranted? History says the profits come from supporting the better team that has not met expectations with a reflection in the adjusted line based on ATS differential. Dropped passes and an adjustment period to a new offensive coordinator need to be cleaned up and in sync since the bye, as the Wolves face a stiff challenge against a revenging Badger bunch. With both teams off a bye, bettors are still remembering Michigan's escape in overtime over Army as a 22-point home favorite and impressed with Wisconsin's two blowout wins and shutouts also against inferior foes. Are the Badgers as good as advertised? Will All-American running back break Jonathan Taylor finally score a TD against Michigan in his third game against the Wolverines; a team that slowed him in last year's 38-13 Michigan win?  We're sticking with value, and believe the adjustment is not yet warranted. Play Michigan. 

Another conundrum but one we'll trust will have the visitors full focus. Sun Belt champion Appalachian State has played a much softer schedule to start the season, so the stats are tougher to gauge. But the Mountaineers make this one of their biggest games, playing an in-state Power 5 program 2 1/2 hours from campus. New first year Mountaineers coach Eliah Drinkwitz knows the Tar Heels well having been NC State's offensive coordinator in recent seasons and beating North Carolina each of the past three seasons. The veteran App State team will bring great motivation and preparation for this contest off their bye week. Veteran coach Mack Brown is back on the sidelines at NC, and after the Tar Heels won their first two games against South Carolina and Miami as underdog, the Heels stumbled last week against rival Wake Forest in a 24-18 road defeat in a game the Deacons both rushed and passed for at least 200 yards. All three of those games went down to the wire, and North Carolina seemingly steps down in class but also has No. 1 Clemson on deck. It's not only a tough situational and scheduling spot for North Carolina, but the more motivated and determined team is the visitor Appalachian State. The Mountaineers should move the ball and score led by a powerful rushing attack. And don't overlook the much stronger special teams of the visitor. The strength of schedule clearly favors North Carolina, but we still like the mini-upset for Appalachian State. 

Cross-metroplex rivals collide, and we'll take the rivalry 'Dog SMU, who is still taking 9.5 points at reduced-juice sportsbook 5Dimes. Not only are the ponies off to a 3-0 start, their best in 35 years on the Hilltop, but they are looking like a much improved team with SMU's offense now explosive and balanced rushing for 250 YPG and passing for 300 YPG. Texas transfer QB Shane Buechele, a former Longhorns starter, is one of a nation-high 16 transfers on this year's roster. Veteran head coach Sonny Dykes, in his second year with SMU following a 2017 in which he served as an offensive analyst under Gary Patterson at TCU, has been confident in this team since summer. Dykes appears to have a team that can snap the stranglehold of an 7-game TCU winning streak over SMU. The Horned Frogs won at Purdue last week with a dominant running game, but the TCU QB's combined for just 8-of-24 passing for 75 yards. That imbalance may allow SMU's improved defense to keep it within range for the SMU offense, which is averaging 44 points per game this early season.  

Situational betting should be noted and understood when handicapping college football, and that includes analyzing bye weeks. While we won't add Old Dominion (+29) to our 'Dog log and underdog picks, the Monarchs are worth a bet this week. Old Dominion comes off a bye rested and ready for Top 25 Virginia, who continues to move forward and improve for quality 4th year head coach Bronco Mendenhall. But the Cavs are in a likely letdown and tough spot this week off their emotional win over Florida State and looking ahead to Notre Dame next week. True sandwich against a team Virginia will walk over but you're paying a steep price in a bad situational spot. To note, Old Dominion was a 29-point underdog at Virginia Tech on Sept. 7. The Monarchs rushed for 203 yards and were out-gained just 403-325 in a 31-17 defeat. Easy cover, and while Virginia Tech has underachieved, the Hokies were still power rated approx. 4 points less than Virginia prior to last week. Virginia is off to a 3-0 start start, but this is not s good situation to be spotting huge points. 

FairwayJay is a leading national sports handicapper and is recognized as one of the sports industry's most insightful analysts. Read more great insights from Jay here and follow him on Twitter: @FairwayJay