Photo credit: AFP.

Pierre-Emerick Aubameyang hit his 27th goal of the season on Wednesday to help Borussia Dortmund seal a 2-0 win at Augsburg to reach the quarterfinals of the German Cup.

Aubameyang, the Bundesliga’s top-scorer with 18 goals in 16 games, slotted home a Lukasz Piszczek pass on 61 minutes to give Dortmund the lead at Augsburg. It continues the Gabon captain’s amazing scoring run as Aubameyang is currently on course to beat Gerd Mueller’s record of 40 Bundesliga goals in the 1971/72 season. At the same stage, more than four decades ago, Mueller had 17 goals, one less than Aubameyang, who has also scored twice in the cup and hit seven in the Europa League.

“I don’t know where his limit is and I don’t think he knows himself,” Dortmund’s director of sport Michel Zorc told German daily die Welt.

“The most important thing for Pierre-Emerick is to stick to what he’s doing, because now the adulation is coming his way from all corners.”

SEE MORE: Groin injury will sideline Marco Reus for remainder of 2015.

Dortmund grabbed their second when Henrik Mkhitaryan’s shot went in off the boot of Augsburg defender Ragnar Klavan on 66 minutes in the third-round clash.

Bundesliga high-fliers Hertha Berlin had no problems seeing off second-division Nuremberg with a 2-0 away success.

Bundesliga bottom side Stuttgart needed extra-time to book their place in the last eight with a 3-2 win over second division Eintracht Braunschweig.

Bochum join Heidenheim as the only other second division side in the last eight draw after their 2-0 win at 1860 Munich.

In Tuesday’s cup ties, a thunderbolt of a volley from Spain international Xabi Alonso booked Bayern Munich’s place in the quarterfinals after a 1-0 win over Darmstadt. Having knocked out holders Wolfsburg in the previous round, Pep Guardiola’s remain the team to beat in the cup.

SEE MORE: Adidas is considering cutting ties with FIFA.

Werder Bremen went through at Borussia Moenchengladbach as they claimed a shock 4-3 win over the hosts to progress.

Javier Hernandez claimed his 16th goal in just 13 games for Bayer Leverkusen when he scored in their 3-1 win at fourth division Unterhaching.

The minnows had dispatched top-tier side Ingolstadt and second division RB Leipzig en route to the last 16 and had even stunned Leverkusen by taking an early lead.