Robert Lewandowski threw down the gauntlet to Pierre-Emerick Aubameyang with a hat-trick in the opening Bundesliga fixture on Friday night, and the Gabon forward duly replied with two goals of his own as Borussia Dortmund beat 1. FSV Mainz 05 on Saturday.

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Last season's top two contenders for the Torjägerkanone are at it again, and this time neither of them is making a secret out of it. "The race is started," said Aubameyang on Twitter after replying to Lewandowski's opening salvo.

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'The race has only just begun!'

Lewandowski won out last season by scoring 30 goals – five more than his rival - and he already has his nose in front after the opening round of Bundesliga matches, but there is plenty of time to make up ground. "He knows the race has only just begun, and I'm ready," said Aubameyang, who might have had a treble of his own.

Scoring opportunities are not likely to be lacking this season either as he seeks to cut the deficit, with summer recruit Andre Schürrle catching the eye with an assist and Ousmane Dembele impressing on his Bundesliga debut against Mainz. "Andre set up the goal for me really well," Aubameyang said. "They're both super players and it's amazing to play with them."

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