A controversial late goal from Petar Sliskovic denied Borussia Dortmund all three points as the league leaders slipped up for the second week running, drawing 1-1 at home to Mainz.

An early goal from Mats Hummels gave Dortmund the lead and Nuri Sahin had the chance to double their lead from the penalty spot, but his effort was saved.

Dortmund continued to dominate the game, but they conceded in the 89th minute to drop two points and give Bayer Leverkusen the chance to reduce their arrears at the top of the table to seven points tomorrow.

Dortmund coach Jurgen Klopp was left fuming on the touchlines as the referee had waved on play with Subotic still laid out on the turf. "I reacted emotionally because the goal was being celebrated while one of my players was still laid out on the ground," fumed Klopp.

"It shouldn't be like that in football. Having said that, the result is fair because Mainz were a strong opponent, things didn't go our way and we missed an early penalty."

The result is fair because Mainz were a strong opponent, things didn't go our way and we missed an early penalty.
Jurgen Klopp, Borussia Dortmund coach

Everything seemed to be going according to plan for Jurgen Klopp's side when Hummels put them in front with a touch of fortune as Mario Gotze's free-kick deflected past Christian Wetklo off his back.

It was Wetklo's turn to be lucky ten minutes later when he fouled Lucas Barrios inside the penalty area, but was only shown a yellow card for the foul. A red card seemed more suitable and Dortmund's anger was compounded when the Mainz goalkeeper pushed Sahin's penalty away.

And as if that was not enough, Dortmund's top goalscorer Barrios was forced to leave the field injured shortly afterwards as a result of the clash. Mainz had a goal disallowed in the 58th minute when Karim Allagui tapped in from close range after Roman Weidenfeller only parried Eugen Polanski's effort, but the Tunisian was in an offside position.

Dortmund began playing down the clock, but while Neven Subotic lay on the ground injured after a clash in the centre of the midfield, Mainz carried on playing.

The ball eventually fell to the feet of Sliskovic in a position where Subotic would normally have been and his first touch of the game was to score the equaliser from close range to spark furious protests from the Dortmund bench.

The Dortmund fans protested too, throwing missiles at Wetklo as he took his time to take a goal kick in stoppage time. But there was no time for Dortmund to go back ahead as they failed to win for the second game running.