Diehard G6 Top 25 — No. 1 Boise State visits No. 2 Western Michigan in the G6 game of the year

Three ranked-vs-ranked matchups and undefeated Tulsa's trip to Arkansas headline a loaded Week 4.

The Group of 6 gets its showcase game Saturday when Diehard G6 Top 25 No. 1 Boise State travels to No. 2 Western Michigan at Waldo Stadium in Kalamazoo. The Broncos are 7.5-point favorites.

Western Michigan (2-1) has won every game it has played except the one the NCAA says it should have won too. Boise State (2-1) shut down Memphis in the second half two weeks ago and beat South Dakota 38-24 last week. Whoever wins Saturday owns the inside track to the G6's College Football Playoff berth.

It is not the only ranked-vs-ranked game on the schedule. Diehard G6 Top 25 No. 16 Colorado State travels to No. 13 UTSA in an 11 a.m. CT kickoff on ESPNU, and No. 23 San Diego State visits No. 19 Toledo on CBS Sports Network at the same time. Three games featuring ranked teams against ranked teams — the most in a single week this season.

The G6 also sends nine teams against Power 4 opponents Saturday, including two unbeaten squads with legitimate upset potential. No. 8 Tulsa (3-0) plays at Arkansas as just a 7.5-point underdog — the smallest G6-vs-SEC spread on the board. No. 9 App State (3-0) travels to NC State as a 13.5-point underdog. No. 22 Delaware goes to Virginia and No. 25 South Alabama visits Kentucky.

Four teams enter the Diehard G6 Top 25 this week: Toledo, UConn, Delaware and South Alabama. Four drop out: Old Dominion (1-2), Hawaii (1-2), North Texas (1-2) and UNLV (1-2). The biggest riser is UMass, which climbs seven spots to No. 18 after starting 3-0. The biggest faller is Tulane, which drops eight spots to No. 24 after a loss at Kansas State.

For the full Week 4 schedule with early odds, read The biggest game Kalamazoo has ever seen.

Here is the Diehard G6 Top 25:

1. Boise State (2-1, Pac-12) — Spencer Danielson, Year 3 (prev: 1)

Beat South Dakota 38-24 to stay at No. 1 after the statement win over Memphis two weeks ago.

This week: at Western Michigan (Diehard G6 No. 2), Saturday, 2:30 PM CT, ESPN2 (BSU -7.5)

2. Western Michigan (2-1, MAC) — Lance Taylor, Year 4 (prev: 2)

Won 28-21 at Rice and has won every game outside the Michigan ending the NCAA admits officials got wrong.

This week: vs. Boise State (Diehard G6 No. 1), Saturday, 2:30 PM CT, ESPN2 (BSU -7.5)

3. James Madison (3-0, Sun Belt) — Billy Napier, Year 1 (prev: 3)

Won 26-13 at San Diego State to go 3-0, beating a ranked opponent on the road.

This week: at Old Dominion, Saturday, 5 PM CT, ESPN+ (JMU -4.5)

4. USF (3-0, American) — Brian Hartline, Year 1 (prev: 4)

Blew out Delaware State 59-17 to stay unbeaten after the road win at Army in Week 2.

This week: at Bowling Green, Saturday, 4 PM CT, ESPN+ (USF -17.5)

5. NDSU (4-0, MW) — Tim Polasek, Year 3 (prev: 5)

Beat Sacramento State 31-10 on the road to go 4-0 in its first season in FBS.

This week: Bye

6. New Mexico (2-1, MW) — Jason Eck, Year 2 (prev: 6)

Lost 14-6 at Oklahoma in the Lobos' first real test after outscoring their first two opponents 108-14.

This week: at New Mexico State, Saturday, 2:30 PM CT, CBSSN (UNM -13.5)

7. Memphis (3-1, American) — Charles Huff, Year 1 (prev: 8, +1)

Beat UT Martin 45-21 to bounce back from the Boise loss and move to 3-1.

This week: Bye

8. Tulsa (3-0, American) — Tre Lamb, Year 2 (prev: 12, +4)

Blew out East Texas A&M 42-0 to go 3-0, with wins over Oklahoma State and Sam Houston already on the resume.

This week: at Arkansas, Saturday, 7 PM CT, SECN+ (ARK -7.5)

9. App State (3-0, Sun Belt) — Dowell Loggains, Year 2 (prev: 15, +6)

Beat Charlotte 26-21 at home to go 3-0 after winning at East Carolina in Week 2 as a 9.5-point underdog.

This week: at NC State, Saturday, 6:30 PM CT, ESPNU (NCST -13.5)

10. Troy (2-1, Sun Belt) — Gerad Parker, Year 3 (prev: 14, +4)

Lost 27-17 at Missouri but covered a 26.5-point spread — an SEC road loss that looked competitive on the field.

This week: at Utah State, Saturday, 6:30 PM CT, CBSSN (USU -2.5)

11. FAU (2-1, American) — Zach Kittley, Year 2 (prev: 13, +2)

Held off FIU 16-10 in the Shula Bowl, grinding out a win after the explosive upset of Navy in Week 2.

This week: at UL Monroe, Saturday, 7 PM CT, ESPN+ (FAU -13.5)

12. Navy (1-1, American) — Brian Newberry, Year 4 (prev: 10, -2)

Had a bye after the 38-30 loss at FAU that dropped the Midshipmen from No. 2 to No. 10 two weeks ago.

This week: at UAB, Friday, 6 PM CT, ESPN (NAVY -7.5)

13. UTSA (2-1, American) — Jeff Traylor, Year 7 (prev: 7, -6)

Lost 30-6 at No. 1 Texas — the schedule did UTSA no favors, but the Roadrunners managed only six points.

This week: vs. Colorado State (Diehard G6 No. 16), Saturday, 11 AM CT, ESPNU (UTSA -12.5)

14. Louisiana (2-1, Sun Belt) — Michael Desormeaux, Year 5 (prev: 19, +5)

Beat UAB 21-14 at home to rise five spots after being ranked 19th a week ago.

This week: at Charlotte, Saturday, 5:30 PM CT, ESPN+ (UL -11.5)

15. Fresno State (2-1, Pac-12) — Matt Entz, Year 2 (prev: 17, +2)

Won 26-10 at San Jose State to move to 2-1, bouncing back from the USC shutout in Week 1.

This week: vs. Rice, Saturday, 9 PM CT, CW (FRES -13.5)

16. Colorado State (2-1, Pac-12) — Jim Mora, Year 1 (prev: 11, -5)

Lost 41-23 at BYU, dropping five spots after beginning the week at No. 11.

This week: at UTSA (Diehard G6 No. 13), Saturday, 11 AM CT, ESPNU (UTSA -12.5)

17. Army (1-1, American) — Jeff Monken, Year 13 (prev: 20, +3)

Had a bye after the 28-24 home loss to USF that dropped Army to No. 20 two weeks ago.

This week: at Temple, Friday, 3 PM CT, ESPN (ARMY -3)

18. UMass (3-0, MAC) — Joe Harasymiak, Year 2 (prev: 25, +7)

Beat Stonehill 36-14 to go 3-0 and climb seven spots — the biggest rise in the Diehard G6 Top 25 this week.

This week: at Sacramento State, Saturday, 8 PM CT, ESPN+ (MASS -5.5)

19. Toledo (2-1, MAC) — Mike Jacobs, Year 1 (prev: NR, NEW)

Beat Temple 49-48 in overtime to enter the Diehard G6 Top 25 for the first time this season.

This week: vs. San Diego State (Diehard G6 No. 23), Saturday, 11 AM CT, CBSSN (TOL -2.5)

20. Liberty (2-1, CUSA) — Jamey Chadwell, Year 4 (prev: 23, +3)

Blew out Ball State 51-15 after surviving Gardner-Webb by one point in Week 2.

This week: at Coastal Carolina, Thursday, 6:30 PM CT, ESPN (LIB -2.5)

21. UConn (2-1, Independent) — Jason Candle, Year 1 (prev: NR, NEW)

Beat Southern Miss 48-20 on the road to enter the Diehard G6 Top 25 in Candle's first season.

This week: at Miami OH, Saturday, 2:30 PM CT, ESPN+ (M-OH -4.5)

22. Delaware (2-1, CUSA) — Ryan Carty, Year 5 (prev: NR, NEW)

Beat Coastal Carolina 22-14 to enter the rankings in the Blue Hens' second FBS season.

This week: at Virginia, Saturday, 5 PM CT, ACCN (UVA -20.5)

23. SDSU (1-2, Pac-12) — Sean Lewis, Year 3 (prev: 21, -2)

Lost 26-13 to JMU at home, falling to 1-2 after beginning the season ranked in the top 10.

This week: at Toledo (Diehard G6 No. 19), Saturday, 11 AM CT, CBSSN (TOL -2.5)

24. Tulane (1-2, American) — Will Hall, Year 1 (prev: 16, -8)

Lost 31-20 at Kansas State — the week's biggest faller, dropping eight spots after consecutive losses.

This week: vs. Southern Miss, Saturday, 6 PM CT, ESPN+ (TULN -19.5)

25. South Alabama (2-1, Sun Belt) — Major Applewhite, Year 3 (prev: NR, NEW)

Beat Ohio 41-36 in a shootout to enter the Diehard G6 Top 25 for the first time this season.

This week: at Kentucky, Saturday, 11:45 AM CT, SECN (UK -20.5)