When you look at the final score in Michigan's 21-18 win over Penn State, it's hard to believe the Wolverines actually pulled it off. Michigan entered halftime trailing 3-0 after managing just 80 yards of total offense, with quarterback Bryce Underwood struggling mightily at quarterback. Kyle Whittingham and Co. made the decision to turn to true freshman Tommy Carr to start the second half, and everything changed. Carr provided a much-needed spark, the offense finally started moving the football and Michigan escaped with a massive victory. It wasn't always pretty, but several Wolverines stepped up when it mattered most.

In a close game like Saturday's, using a tool like Pro Football Focus allows us to see what happened on a player-by-player basis and gives some insight as to how it really went. It's not gospel, but there are some things that just don't show up in the box score that can tell another part of the story.

Beigel was Michigan's highest-graded offensive player among those who played at least 25 snaps, earning an impressive 82.2 overall grade. The extra offensive lineman played 26 snaps and was particularly effective as a run blocker, earning a team-high 78.1 run-blocking grade. He also posted a 74.6 pass-blocking grade across seven pass-blocking snaps. Michigan's offense struggled to establish much of anything in the first half, but Beigel's performance at the Rhino position was one of the bright spots up front.

Hansen made the most of his opportunities against Penn State, earning a 79.7 overall offensive grade across 26 snaps. His biggest contribution came in the passing game, where he earned an outstanding 86.8 receiving grade, the highest among Michigan's qualifying offensive players. He only had two catches for 31 yards but he did his job consistently during the passing game. Hansen played 11 passing snaps and also contributed as a blocker, earning a 67.0 pass-blocking grade. His 57.2 run-blocking grade wasn't nearly as impressive, but PFF clearly liked what it saw from him as a receiving option.

Carr's impact went well beyond his 72.0 overall offensive grade. After replacing Underwood at halftime, the true freshman completely changed the complexion of the game. He played 31 offensive snaps, earning a 62.3 passing grade and a much stronger 70.4 rushing grade. Carr's ability to make plays with his legs helped jump-start an offense that had been completely ineffective through two quarters. Most importantly, he helped turn a 3-0 halftime deficit into a 21-18 Michigan victory.

Michigan's offensive line actually performed quite well in pass protection. Jake Guarnera led the team with an outstanding 86.7 pass-blocking grade, followed by Evan Link (84.8), Avery Gach (84.5), Jordan Marshall (83.1) and Blake Frazier (81.0). However, Link's 53.7 run-blocking grade showed that the Wolverines still have some issues to address up front.

The quarterback comparison was also interesting. Underwood finished with a 60.5 overall offensive grade, including a 61.3 passing grade, while Carr earned a 72.0 overall grade. Carr also outperformed Underwood as a runner, grading out at 70.4 compared to Underwood's 58.2.

Michigan's lowest-graded offensive player was Travis Johnson, who finished with a 47.2 overall grade across 12 snaps. Andrew Marsh also struggled by PFF's evaluation, earning a 52.2 overall grade despite playing 48 offensive snaps.