BERLIN: Granit Xhaka鈥檚 early strike was enough for Bayer Leverkusen to win the German Cup final 1-0 over Kaiserslautern for an unbeaten domestic double on Saturday.

Xhaka fired the ball in under the crossbar from distance in the 16th minute. It proved to be enough against second-division Kaiserslautern despite losing defender Odilon Kossounou to a second yellow card just before the break.

Leverkusen won the Bundesliga unbeaten, a historic feat. The only blip on the record of Xabi Alonso鈥檚 team this season was losing the Europa League final to Atalanta 3-0 on Wednesday in Dublin. That ended Leverkusen鈥檚 record 51-game unbeaten run across all competitions. It was their only loss in 53 games this season.

鈥淭he whole journey, the whole season was wonderful,鈥� the Spanish coach said after doubling Leverkusen鈥檚 trophy haul in just one season. 鈥淲hat we did this season is unbelievable.鈥�

Alonso and his players ran to their fans after the whistle on Saturday in Berlin鈥檚 Olympiastadion. They had supported the team loudly throughout, though were drowned at times by the even more vociferous Kaiserslautern supporters.

They displayed a spectacular tifo of a red devil grasping the trophy in front of a hellish background of fire and brimstone before the game. Flares sending red smoke into the sky embellished the effect 鈥� and gave an inkling of what was to come.

The stadium announcer鈥檚 repeated requests to stop the pyrotechnics were met with continued indifference. The second half began to a huge fireworks display from the Leverkusen fans.

Despite the smoke above, there was little fire on the field after a long hard season. Kossounou was booked for stopping Kenny Prince Redondo鈥檚 break in the third minute, then issued another yellow for a foul on Boris Tomiak in the 44th.

It didn鈥檛 stop the Leverkusen machine from grinding out the win. Jeremie Frimpong should have made it 2-0 in the 75th after going past the goalkeeper.

It鈥檚 Leverkusen鈥檚 second German Cup title after beating Hertha Berlin鈥檚 reserve team in the 1993 final. Leverkusen鈥檚 other trophy is the 1988 UEFA Cup.