Bayer Leverkusen went one point clear at the top of the Bundesliga after a 3-0 win at struggling Mainz although Bayern Munich can regain pole position later on Saturday.
Leverkusen, who dropped their only points in the league this season in a 2-2 draw at Bayern, took the lead after 18 minutes as wing-back Jeremie Frimpong forced Mainz defender Sepp van den Berg into an own goal.
Dead-ball specialist Alejandro Grimaldo doubled Leverkusen's lead with a pinpoint free-kick before Germany winger Jonas Hofmann scored a third to round out the win.
Hofmann, who moved to Leverkusen in the summer, having spent seven years at Borussia Moenchengladbach, now has three league goals and three assists in the Bundesliga for his new club.
"It's a lot of fun. Everyone pats you on the shoulder and tells you how nice the football looks," said Hofmann.
'EXTREME POTENTIAL'
Hofmann toasted his team's "extreme potential" after Leverkusen's best start to a league season in their history, but said "it's important to stay humble."
Mainz have just one point and are bottom of the table after six matches.
Union Berlin's poor start to the season continued, losing 1-0 away at promoted Heidenheim thanks to a second-half goal from Jan-Niklas Beste.
Beste's free-kick deflected into the net midway through the second half, consigning Champions League participants Union to their fifth consecutive defeat in all competitions for the first time since 2004.
Surprise package Stuttgart continued their remarkable rise this season, winning 2-0 at Cologne thanks to a brace from Deniz Undav.
Stuttgart, who needed to win a relegation playoff against Hamburg last season to stay in the top division, are now second after six matches.
The game did however mark the first time
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