It's rare for a true freshman like Christian Hackenberg to earn the starting quarterback job -- but it's not unheard of in the Big Ten.
We took a look at the Big Ten true freshmen who came before the Penn State signal-caller to see how they fared. We looked at quarterbacks from the past 10 years who started at least six games that first year and offered a rundown of those true freshman seasons, along with how their careers played out.
There's no telling right now where the four-star Hackenberg (Scout grade: 88) might end up. But here's what Big Ten history has to say:
Philip Nelson, Scout grade: 74
Freshman stats: 75-of-152 (49.3 percent) for 873 yards, eight TDs, eight INTs; 69 carries for 184 yards
Record as freshman starter: 2-5
Freshman synopsis: Nelson was expected to redshirt but, between injuries and inconsistent QB play, his number was called earlier. He started the last seven games and had limited success. But he showed some potential such as the Purdue win, where he completed 68 percent of his passes and threw three touchdowns.
College career & beyond: He started Week 1 and helped lead Minnesota to a 51-23 win over UNLV. He could be in line to become a four-year starter, and all eyes will be on whether he can guide Minnesota to back-to-back bowls.
Penn State, 2010
Rob Bolden, Scout grade: 81
Freshman stats: 112-of-193 (58 percent) for 1,360 yards, five TDs, seven INTs; 30 carries for minus-11 yards, one TD, one fumble lost
Record as freshman starter: 5-3
Freshman synopsis: Bolden became the first true freshman to start a PSU opener in 100 years. He impressed in Week 1 by dominating Youngstown State with 239 passing yards, two TDs and a pick -- but his season would falter afterward. He seemed to regress, and a quarterback battle with Matt McGloin lasted all season. (Actually, for two seasons.) PSU finished 7-6 and lost to Florida in the Outback Bowl. Bolden didn't play in the postseason.
College career & beyond: Bolden transferred to LSU last year but has yet to attempt a pass. He's not poised for any playing time, and rumors have continued to circulate that he's considering another transfer.
Tate Forcier, Scout grade: 81
Freshman stats: 165-of-281 (58.7 percent) for 2,050 yards, 13 TDs, 10 INTs; 118 carries for 240 yards, three TDs, four fumbles lost
Record as freshman starter: 5-7
Freshman synopsis: He got off to a solid 4-0 start and made his mark by throwing a last-second, game-winning TD against Notre Dame. ESPN analyst Matt Millen, echoing a shared sentiment of Forcier's bright future, called him the best QB in the B1G. But his career took a nosedive in Week 5. The Wolverines lost to Michigan State, 26-20, and Forcier would win just one more game -- against Delaware State -- the rest of the season. His early performance still helped him earn a spot on ESPN's All-Big Ten freshman team.
College career & beyond: He was briefly listed as the third-string QB at the start of the next season and saw limited time behind Denard Robinson. He hoped to transfer to Miami (Fla.) after a sophomore slump but ended up at San Jose State. He then withdrew from that school in January, 2012 because of poor academic standing.
Ohio State, 2008
Terrelle Pryor, Scout grade: 93
Freshman stats: 100-for-165 (60.6 percent) for 1,311 yards, 12 TDs, four INTs; 139 carries for 631 yards, six TDs, one fumble lost
Record as freshman starter: 8-1
Freshman synopsis: He came in as a consensus top-five national recruit, and he lived up to expectations. By Week 4, the dual-threat rookie supplanted Todd Boeckman -- a quarterback who took the Buckeyes to the national title game a year before -- and started the rest of the regular season. OSU finished 10-3 and lost the Fiesta Bowl to Texas. He was named Big Ten freshman of the year.
College career & beyond: He helped OSU earn three straight BCS berths before declaring early for the NFL's 2011 supplemental draft when it looked as if he'd be suspended. Oakland gave up a third-round pick for him, and he currently looks to be the backup. He has thrown for 155 yards so far in his NFL career.
Juice Williams, Scout grade: 82
Freshman stats: 103-for-261 (39.5 percent) for 1,489 yards, nine TDs, nine INTs; 154 carries for 576 yards, two TDs, six fumbles lost
Record as freshman starter: 1-8
Freshman synopsis: Williams got the nod in Week 4 and shocked the nation one week later at Michigan State. Coming in as huge underdogs -- about four touchdowns -- Illinois' Williams threw for 122 yards and rushed for 103 to upset the Spartans 23-20. Illinois dropped the last seven games and finished 2-10, but four losses were decided by one score. He was an honorable mention on The Sporting News' freshman All-American team.
College career & beyond: Williams' sophomore campaign was a memorable one, as he beat No. 1 Ohio State -- the Illini's first win over the top-ranked team in a little over a half-century -- and finished 9-4 with a season-ending loss in the Rose Bowl. That was the highlight of his career, however, as he won just eight games over the next two seasons.
Chad Henne, Scout grade: N/A
Freshman stats: 240-of-399 (60.2 percent) for 2,743 yards, 25 TDs, 12 INTs; 55 carries for minus-137 yards, two TDs, two fumbles lost
Record as freshman starter: 9-3
Freshman synopsis: The Pennsylvania native started Week 1 when a sore arm hindered Matt Gutierrez, and Henne never looked back. He picked up national headlines in October after back-to-back 300-yard games. Said Minnesota coach Glenn Mason: "If you didn't know he was a freshman, you wouldn't know he was a freshman." He tied Elvis Grbac's season record for touchdown passes with 25 and, unsurprisingly, made the All-American freshman team. He also led Michigan to the Rose Bowl, in which it lost to Texas, 38-37.
College career & beyond: Henne's college career saw its ups and downs, but he's still at -- or near -- the top of most Michigan passing records. He went 0-4 against Ohio State, but UM still finished in the top 25 in three of his four seasons. Miami selected him the second round of the 2008 NFL draft, and he's now the backup QB on Jacksonville.