Pierre-Emerick Aubameyang has thrown down a challenge to Robert Lewandowski after opening his account for the new season with a brace in Borussia Dortmund's 2-1 win over Mainz.

The Gabon international striker, who scored 25 league goals last season, headed his side in front on 17 minutes before converting a penalty late on.

Meanwhile Lewandowski, who topped the Bundesliga goal charts last term with 30, claimed a hat-trick in Bayern Munich's opening game which saw them hammer Werder Bremen 6-0 on Friday.

Aubameyang, however, is keen to go toe-to-toe in the goalscoring stakes with the prolific Pole.

"I feel very good," he said. "I'm ready to compete with Robert Lewandowski for the crown as the Bundesliga's top scorer. 

"But I need to thank my team-mates. It wasn't easy out there today due to the weather, but we still managed to start the season with a win. We can be happy."