Arizona - WR Trey Griffey So.
The true breakout star for the Wildcats will likely actually be who ends up being the starting quarterback or running back, but there is still a long ways to go before we know who that will me. The Wildcats should have a devastating one-two punch at receiver in a healthy Austin Hill and breakout star himself in Nate Philips, so there will be ample opportunity for a third receiver to step up and Griffey could be that guy with his excellent size (6'3 190). Griffey came on in late 2013, making all of his catches in the final four games, including a two-touchdown performance in the AdvoCare V100 Bowl.
Arizona State - S Marcus Ball Fr.
Ball was poised to start at safety as a true freshman last season before a shoulder injury and now is set to become a starter after a redshirt season. Ball has the size (6'3 205) and athleticism to fill Alden Darby's shoes and could immediately become the Sun Devils' best defensive back.
Cal - RB Khalfani Muhammad So.
The small (5'8 175) speedsters emergence as a freshman was one of the few bright spots of Cal's 2013 season. Looking like an excellent accompaniment to Cal's Bear Raid passing attack, Muhammad average more than nine years per-carry in Cal's final five games and flashed the ability to turn any carry into a long touchdown run.
Colorado - QB Sefo Liufau So.
Liufau ended up winning the starting job for Mike MacIntyre in mid-October and shined as much as any Colorado QB has in quite a while as just a true freshman, throwing for nearly 1,800 yards with 12 touchdowns to eight interceptions in just eight games in the toughest part of the Buffs' schedule. He reportedly looked great in Colorado's spring practice and looks like he could be the guy to lead the way for Colorado's turnaround under MacIntyre.
Oregon - WR Jalen Brown Fr.
An early-enrollee that has really impressed during the off-season, the star recruit has just as good of a chance as any healthy receiver on the Ducks' roster to become their top receiver in 2014 with Bralon Addison going down with an ACL injury. A smooth receiver who has already flashed quite a bit of maturity, Brown could quickly become Marcus Mariota's go-to receiver.
Oregon State - TE Connor Hamlett Sr.
Hamlett should be very well known by Beaver fans and hardcore Pac-12 fans, but with Austin Seferian-Jenkins and Chris Coyle gone, everyone will likely know Hamlett in 2014 as the conference's top tight end. The pass-catching machine should be targeted even more in 2014 with Brandin Cooks off to the NFL.
Stanford - T Kyle Murphy Jr.
Stanford has become an All-American offensive lineman factory, and while Andrus Peat looks to be the next in line, he's not exactly a sleeper having already racked up honors as a sophomore, so look for the former five-star recruit and 6'7 295 freak to be the next to rack up honors. Murphy has played spot duty very well in his first two years as a Cardinal but will now become a full-time starter and should fill in the tackle spot vacated by Cameron Fleming exceptionally well.
UCLA - DT Eddie Vanderdoes So.
Anyone who follows recruiting already knows who Vanderdoes is and he had a fantastic freshman season, but I think he will quickly turn into a true star in 2014, as in first-team All-Pac-12-level star. He will especially have a chance to shine with studs like Ellis McCarthy and Kenneth Clark surrounding him, preventing teams from double-teaming the dynamic sophomore.
USC - S Su'a Cravens So.
Another player who recruitniks should all know that had a great freshman season, but has still yet to become a star. Cravens earned a lot of freshman All-American honors in 2013, but expect him to get some general All-American buzz in 2014.
Utah - RB Bubba Poole Jr.
Poole burst out for 100-yard games against Oregon State and Stanford and showed the ability to shoulder a heavy carry load at times. He is an explosive player that will get more carries in 2014 with Kelvin York graduated and I expect him to make the most of it as Utah looks to improve their running game.
Washington - RB Shaq Thompson Jr.
Thompson has already broken out as a linebacker, but he has been working in as a running back during the spring and could be the next Myles Jack. He was one of the top pure athletes in the entire country when he came out of high school, so expect him to do some very impressive things with the ball in his hands in 2014.
Washington State - WR River Cracraft So.
The Cougars spread the ball out to a bunch of receivers better than just about anyone in the country, so they have a ton of receivers that put up numbers and it led to the ultra-productive Cracraft's stellar 2013 slipping through the cracks of most Pac-12 fans. Gabe Marks and Dom Williams hold it down as the Cougars' top two targets, but Cracraft is coming off of a huge performance in the New Mexico Bowl and could become one of the best third options in the conference.