With the regular season in the books, Sports Illustrated's college football experts have made their selections and chosen the 2015 All-America Team.

It was a tight race at several positions, including quarterback where a single vote boosted Oklahoma's Baker Mayfield to the first team while Clemson's Deshaun Watson was relegated to the second team. Stanford's Christian McCaffrey couldn't even crack the second team at running back, but the Heisman finalist was a unanimous selection as the first team's all-purpose player. McCaffrey was one of just four unanimous to the first team, joining Baylor wide receiver Corey Coleman, Stanford guard Joshua Garnett and Baylor offensive tackle Spencer Drango.

Previewing the 'other' college football awards: Who wins Maxwell, Thorpe?

Alabama and Ohio State earned the most first-team selections of any program with three honorees each. The Buckeyes got the most players on the first or second team with six total players. Oklahoma got two players on the first team and no second-team selections, but six Sooners players earned honorable mention. Center Jack Allen was Michigan State's lone selection to the first or second team, but the Spartans got four to honorable mention. Clemson was the lone College Football Playoff squad to not have a player selected to the first team. The Tigers had four players chosen to the second team along with three honorable mentions.

The Big Ten and SEC tied for the most players selected to the first or second teams with 14, but the Big Ten led all conferences with eight first-team choices. The SEC had six players picked for the first team, followed by the Big 12 with five, the Pac-12 with four and the ACC with two.

For more college football coverage on the end of the regular season and transition into bowl season, check out Zac Ellis's rating of all 40 bowl matchups and SI.com's complete bowl schedule.

*Unanimous selection

. QB - Baker Mayfield

Oklahoma, Junior

Snubbed for the Heisman ceremony, Mayfield led Oklahoma to the playoff with 3,389 yards passing.

. RB - Derrick Henry

Alabama, Junior

The Heisman hopeful led the nation and set an SEC record with 1,986 rushing yards to go with 23 TDs.

. RB - Dalvin Cook

Florida State, Sophomore

The Seminoles star averaged 7.86 yards per carry, the second-highest average in the country.

. WR - Corey Coleman*

Baylor, Junior

Despite shakeups at QB due to injuries, Coleman still racked up 1,363 receiving yards and 20 scores.

. WR - Josh Doctson

TCU, Senior

A wrist injury limited him for the final four games, but Doctson still compiled 1,327 receiving yards and 14 TDs.

. te - Jake Butt

Michigan, Junior

One of the most active tight ends in any offense, Butt caught 48 passes for 620 yards for the Wolverines.

. T - Taylor Decker

Ohio State, Senior

The highly touted NFL prospect opened holes for Ezekiel Elliott and the nation's No. 7 offense in yards per carry.

. G - Joshua Garnett*

Stanford, Senior

Garnett paved the way for Christian McCaffrey's breakout in coach David Shaw's powerful offense.

. C - Jack Allen

Michigan State, Senior

The Rimington finalist showed versatility, moving to left tackle for two games and taking a handoff for a TD.

. G - Sebastian Tretola

Arkansas, Senior

The All-SEC lineman allowed a half sack in 25 career games, helping Arkansas lead the SEC in sacks allowed.

. T - Spencer Drango*

Baylor, Senior

The Big 12's O-lineman of the year anchored the line for the nation's top offense in yards and points per game.

. DE - Joey Bosa

Ohio State, Junior

Frequent double- (and triple-) teams have decreased his numbers, but Bosa's impact and skill are still top-notch.

Alabama, Junior

Robinson consistently plugged holes, helping Alabama lead the country with 2.4 yards allowed per rush.

. DE - Carl Nassib

Penn State, Senior

The nation's leader in sacks brought down the QB 15.5 times this season and tied for second with 19.5 TFLs.

. LB - Eric Striker

Oklahoma, Senior

Striker guided the top defense in the Big 12 with 17 tackles for loss and nine sacks along with 68 tackles.

. lb - Jaylon Smith

Notre Dame, Junior

The explosive Smith led Notre Dame with 113 tackles, including nine tackles for loss and a forced fumble.

. LB - Reggie Ragland

Alabama, Senior

The leader of the nation's top defense in yards allowed per play, Ragland was a consistent playmaker.

. lb - Kentrell Brothers

Missouri, Senior

Brothers shot to the ball all season with an FBS-best 152 tackles, as well as two interceptions and a forced fumble.

. CB - Jourdan Lewis

Michigan, Junior

Lewis's Power 5-best 21 passes defended helped Michigan lead the nation in yards allowed per attempt.

. S - Jeremy Cash

Duke, Senior

Only 10 players averaged more TFLs than Cash despite his role in the secondary. He also made 101 tackles.

. S - Vonn Bell

Ohio State, Junior

The junior led the Buckeyes with nine passes broken up and scored a pick-six against Minnesota.

. cb - Desmond King

Iowa, Junior

The Thorpe Award finalist's eight interceptions led the Power 5 and were key to the Hawkeyes' 12–0 start.

UCLA, Senior

The Groza finalist made the first 60-yard field goal in an FBS game since 2012. He hit 20 of 23 kicks this year.

. P - Tom Hackett

Utah, Senior

Hackett helped Utah lead the nation in net punting average, allowing just nine returns all season.

. r - Evan Berry

Tennessee, Sophomore

Berry averaged 38.3 yards per kick return to lead the FBS. He took three kicks to the house this season.

. AP - Christian McCaffrey*

Stanford, Sophomore

The Heisman finalist broke Barry Sanders's record with 3,496 all-purpose yards this season.

Second Team

Offense

QB Deshaun Watson, So., Clemson

RB Leonard Fournette, So., LSU

RB Ezekiel Elliott, Jr., Ohio State

WR JuJu Smith-Schuster, So., USC

WR Will Fuller, Jr., Notre Dame

TE Hunter Henry, Jr., Arkansas

OT Vadal Alexander, Sr., LSU

OG Greg Pyke, Jr., Georgia

C Ryan Kelly, Sr., Alabama

OG Pat Elflein, Jr., Ohio State

OT Ronnie Stanley, Sr., Notre Dame

Defense

DE Shaq Lawson, Jr., Clemson

DT Robert Nkemdiche, Jr., Ole Miss

DE DeForest Buckner, Sr., Oregon

LB Tyler Matakevich, Sr., Temple

LB Blake Martinez, Sr., Stanford

LB Darron Lee, So., Ohio State

LB Anthony Walker, So., Northwestern

CB Jalen Ramsey, Jr., Florida State

S Jabrill Peppers, R-Fr., Michigan

S Jayron Kearse, Jr., Clemson

CB Vernon Hargreaves III, Jr., Florida

Special Teams

K Greg Huegel, R-Fr.., Clemson

P Drew Kaser, Sr., Texas A&M

R William Likely, Jr., Maryland

AP Jakeem Grant, Sr., Texas Tech

Honorable Mention