Another goal and this will definitely be all over. Lucas Alario chests down Wendell's pass but screws his volley well wide.

Think I can confidently say this would be the greatest German Cup shock of all time now if Saarbrucken could turn this round.

Another half chance for the underdogs but Steven Zellner heads over the bar.

Saarbrucken have their first shot of the game but it's a weak one from Steven Zellner from long range and the Leverkusen keeper gathers. That's one shot to nine so far. The hosts have had 13% possession.

Bayer Leverkusen's 17-year-old Florian Wirtz almost scores his second goal in a week but shoots straight at Daniel Batz, who saved five penalties in the quarter-final.

Saarbrucken had said they wouldn't know for sure if they were match fit until the game started. They're looking a bit rusty so far - but then again they are against an opponent three divisions above them.

Wendell crosses and Lucas Alario heads over. Saarbrucken just need to weather this storm.

A second Bayer Leverkusen goal could kill this game off - let's hope that doesn't happen from a neutral/underdog point of view. Karim Bellarabi has a free-kick but blasts it into the wall.

Much more promising from the hosts. Timm Golley runs onto a long ball but slips in the box and then Leverkusen's goalkeeper is almost closed down. At least they're giving the visitors something to think about now.

Saarbrucken's first venture forward and Leverkusen defender Edmond Tapsoba gets booked for fouling Steven Zellner.

The free-kick is headed away and the offside flag eventually ends the move.

Kerem Demirbay has a 20-yard shot blocked, corner to Leverkusen. But the home defence deal with it.

No crowd noise piped in for this one, you can just hear the shouts from players and the benches. This would have been a 6,800 sell-out, just like Saarbrucken's previous three cup games.

It's all Leverkusen so far.

Charles Aranguiz has a shot blocked. Saarbrucken are basically penned into their own box.

Saabrucken take the kick-off... and boot it straight out for a goal-kick. I think they were aiming for the corner.

Here we go. Will we witness one of the greatest cup stories of all time tonight?

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Saarbrucken leave their top goalscorer in this cup run - Gillian Jurcher - and their top assister - Kianz Froese - on the bench.

There are two changes from their cup win in the last round over Fortuna Dusseldorf back in March - Timm Golley and Sebastian Jacob.

Bayer Leverkusen make five changes from their 4-2 defeat by Bayern Munich.

There is a start for 17-year-old Florian Wirtz, who became the youngest Bundesliga goalscorer ever in that game. Star man Kai Havertz is out through injury.

Saarbrucken: Batz, Barylla, Schorch, Uaferro, Muller, Golley, Perdedaj, Zeitz, Janicke, Jacob, Zellner. Subs: Bulic, Vunguidica, Mendler, Froese, Jurcher, Breitenbach, Miotke, Eisele, Castellucci.

Bayer Leverkusen: Hradecky, Weiser, Tapsoba, Bender, Wendell, Aranguiz, Demirbay, Wirtz, Paulinho, Diaby, Alario. Subs: Tah, Dragovic, Amiri, Baumgartlinger, Palacios, Ozcan, Stanilewicz, Volland, Bellarabi.

Bayer Leverkusen are fifth in the Bundesliga - only outside the top four on goal difference - after three wins and two defeats since the restart.

They lost 4-2 to Bayern Munich on Saturday.

Coach Peter Bosz said: "I think it's an advantage for us not to have a crowd.

"In a full stadium, every attack and every time they're in possession would get the home fans going and that helps the players. That won't be the case here."

Image source, Getty Images