Javi Martinez played every minute of all four preseason games after returning from World Cup duty, and the vast majority of his playing time was spent in central defense.
His first game was marred by a poor mistake in which he was unnecessarily beaten to the ball and conceded a penalty to Gladbach's Andre Hahn. And against the MLS All-Stars, he was unable to contest a header that assisted Bradley Wright-Phillips' equalizer.
Martinez is a great holding midfielder, but he was a weak point in defense for Bayern throughout the preseason.
The 25-year-old made his long-awaited return to football in a Bayern shirt last month in a friendly against his hometown club, FC Memmingen.
Badstuber had spent approximately 20 months on the sidelines as he recovered from consecutive cruciate ligament tears but has impressed Pep Guardiola to the point that the trainer declared him (in a recording via German source Bild) the most talented center back he's ever coached.
He's been less often used since, however, failing to start in either of Bayern's games in the United States.
Badstuber still has a long way to go in his recovery, but he gets a B+ for effort simply on merit of returning from a pair of injuries that would have ended the careers of many.
David Alaba has been used in a variety of roles in preseason but is classified as a center back due to him being used in that role more than any other during the preseason.
The Austria international was off the mark in brilliant form, scoring twice in his first test match.
By no means a natural center back, Alaba was given freedom to move into midfield. He seemed to relish this role in possession, although there were times when Bayern could have used a taller, more imposing player to defend in his position.
That's more of a coach's decision, though, so Alaba gets high marks for his performance.
Much like Alaba, Rafinha was a mainstay in the Bayern team during preseason and played in more than one role. The Brazilian was primarily deployed as a center back, though, and started all but one game.
Although he generally was comfortable when he drifted into attack, the ex-Genoa man's strength let him down in more than one situation, as did his positioning. To boot, his spot-kick miss against Gladbach nearly sent Bayern out of the Telekom Cup early.
Like Alaba, Rafinha deserves some sympathy for being used so far out of position in an entirely unfamiliar role. But he certainly didn't make the most of the situation.