Guirassy took his tally to 14 goals in eight games by converting Stuttgart’s first chance in the 16th minute. But the Guinea forward had to go off injured in the 30th. Stuttgart later said it was a left hamstring problem.

Silas Katompa Mvumpa doubled the lead on a counterattack in the 81st, before Deniz Undav completed the scoring with a header in the 88th.

It was Stuttgart’s sixth straight victory and it stretched Union’s losing run across all competitions to eight games. This was arguably the Köpenick-based team's worst performance from those matches.

“In the first half nothing came together. We weren’t aggressive enough against the ball and had hardly any attack,” said Union coach Urs Fischer, who made three changes at the interval. “After the break it was better, more of an even game in which we also had chances to equalize. We weren't well positioned for the goals we conceded and again we're left empty-handed in the end.”

Union next hosts Italian champion Napoli in the Champions League on Tuesday.

“To be honest I'm happy that it's now against Napoli. That's a game in which there's nothing to lose," Union sporting director Oliver Ruhnert said. “Perhaps the team needs a game like that now, because the confidence is in the basement – you could see that clearly today.”

Leverkusen digs deep

Leverkusen stayed top after eight rounds, one point ahead of Stuttgart, thanks to Jeremie Frimpong in a hard-fought win over Wolfsburg.

Facing three defenders, Victor Boniface dug out a cross for Frimpong to score the opener at the far post in the 13th.

But Leverkusen failed to maintain control after the goal and needed goalkeeper Lukas Hradecky to preserve its lead.

The home team equalized through Maxence Lacroix in the 41st after the visitors failed to adequately clear a corner.

Leverkusen coach Xabi Alonso sent on Florian Wirtz in the 60th and the young Germany midfielder had an immediate impact as he won the ball in front of the penalty area. Frimpong tried pulling it back for Wirtz, but it fell for Álex Grimaldo to score with a deflected shot in the 62nd.

Loïs Openda scored twice as Leipzig won 3-1 at promoted Darmstadt, Eintracht Frankfurt won 3-1 at Hoffenheim, and Freiburg defeated Bochum 2-1.

Mainz was hosting Bayern Munich later.

(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)