Bundesliga champions Bayer Leverkusen battled past second-tier Kaiserslautern 1-0 on Saturday to win the DFB-Pokal and secure the club's first domestic double.

Leverkusen missed out on a treble after losing 3-0 to Atalanta in the Europa League final on Wednesday, in what was astonishingly their first defeat of the season in all competitions, after a European record 51-game unbeaten run.

But at Berlin's Olympic stadium, which will host the Euro 2024 final in July, Xabi Alonso's side ensured they capped off a remarkable campaign with another piece of silverware thanks to Granit Xhaka's stunning 16th-minute strike.

The ball rolled out to the former Arsenal man around 25 yards out, and he planted an unstoppable first-time effort into the left-hand side of the net.

They controlled the pace even after they were reduced to 10 men following Odilon Kossounou's second booking a minute before half-time.

Kaiserslautern rarely threatened after the break, with Leverkusen limiting their opponents to just 0.2 expected goals.

And even though they could not add to their lead, Leverkusen were able to comfortably wrap up their second trophy of the best season in the club's history.

Data Debrief: Leverkusen join the club

Leverkusen are only the fifth different side to win the double in Germany since the Bundesliga was founded, after Bayern Munich (13 times), 1. Koln, Werder Bremen and Borussia Dortmund.

Xhaka's strike was a worthy winner. He became the first Swiss player to score in a DFB-Pokal final.

Bayer Leverkusen have quickly put Wednesday's Europa League final defeat to Atalanta behind them, says coach Xabi Alonso.

The freshly-crowned Bundesliga champions can clinch a first-ever domestic double with victory over second-division Kaiserslautern in Saturday's final.

Leverkusen had the opportunity to complete an unbeaten treble but saw their 51-match unbeaten run in all competitions ended in the Europa League final on Wednesday when they lost 3-0 to Atalanta.

Now, they have the opportunity to cap an already memorable season by winning the DFB-Pokal.

"It was a long way to get here, since August last year," said Alonso of Saturday's showcase at Berlin's Olympic stadium.

"We are here. It is great to have the last game of the season as a final. After Wednesday, we are ready and focused for tomorrow. We have to have the hunger and I think after Wednesday we have it more."

Prior to this season's Bundesliga title, Leverkusen's last trophy was the 1993 DFB-Pokal.

Alonso said the team had little time to review their first defeat of the season, but they had already put the loss behind them, having a shot at the double.

"The time for analysis is short because our focus is now on tomorrow. What happened on Wednesday hopefully will not have much influence," Alonso added.

"We have to continue after the defeat. The goal is big. Tomorrow we can cap it with the Cup. Dublin is gone and behind us, and now we think about Berlin."

Saarbrucken’s incredible run in the DFB-Pokal came to a disappointing end as they lost 2-0 to Kaiserslautern in the semi-finals.

Kaiserslautern failed to have a single effort on target in the first half at the Ludwigsparkstadion, but were a different side in the second period to book their place in May’s final in Berlin thanks to goals from Marlon Ritter and Almamy Toure.

Runaway Bundesliga leaders Bayer Leverkusen face Dusseldorf in the second semi-final on Wednesday.

Third-tier Saarbrucken had claimed some huge scalps on their way to the last four, dumping reigning Bundesliga champions Bayern Munich out in the second round before earning a 2-0 victory over Eintracht Frankfurt.

Their quarter-final against Borussia Monchengladbach saw them snatch victory with another late goal, this time from Kai Brunker in the third minute of added time.

However, Brunker was unable to reproduce such heroics in the semi-final, firstly heading straight at visiting goalkeeper Robin Himmelmann and then failing to get his diving header on target from a Marcel Gaus free-kick.

Saarbrucken goalkeeper Tim Schreiber was called into action for the first time in the 48th minute as he comfortably saved a 25-yard shot from Filip Kaloc, but the 21-year-old then committed a costly error to gift Kaiserslautern the lead.

Ritter’s glancing header from Toure’s cross appeared to lack the power to trouble Schreiber, only for the ball to somehow go through the goalkeeper’s legs at the near post.

Toure doubled his side’s lead on 75 minutes with a far better header into the far corner from Tymoteusz Puchacz’s inswinging free-kick and that always looked enough to seal victory for Friedhelm Funkel’s side.

Saarbrucken pushed forward in search of the goal needed to get them back into the tie but Brunker’s miserable night in front of goal was summed up when he blazed a half-volley over the bar from close range and beat the ground with his fists in frustration.

It is the first time Kaiserslautern have reached the final of the DFB-Pokal since 2003 – when they lost to Bayern Munich – and they will be massive underdogs if, as expected, Xabi Alonso’s unbeaten Leverkusen side are their opponents.

However, Kaiserslautern’s route to the final four did include a 3-2 win against top-flight opponents Cologne in the second round before victories over Bundesliga 2 rivals FC Nuremberg and Hertha BSC.