Bayern players react after the German first division Bundesliga football match between Bayern Munich and Borussia Moenchengladbach in Munich, southern Germany on Aug 27, 2022. (KERSTIN JOENSSON / AFP)

BERLIN - Union Berlin host champions Bayern Munich on Saturday in a classic David versus Goliath battle for top spot in the Bundesliga.

Swiss coach Urs Fischer's Union may only has a few years of Bundesliga experience and operate on a fraction of their opponents' annual budget but his team has now gone 11 games without defeat, stretching into last season

Swiss coach Urs Fischer's Union may only has a few years of Bundesliga experience and operate on a fraction of their opponents' annual budget but his team has now gone 11 games without defeat, stretching into last season.

With their 10 points from four games — as many as leaders Bayern — the club has set a record for their best season start and their run comes on the back of a strong previous campaign that saw them finish fifth, narrowly missing out on a Champions League spot.

Union this season has picked up where they left off and after firing six goals past hosts Schalke 04 last week they have now scored 11 in their four league games — another club record — with Sheraldo Becker joint top scorer in the Bundesliga with four.

Only Bayern has scored more goals in the league so far with 16 but following a powerful first three games they slipped up last week with a draw against Borussia Moenchengladbach.

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Bayern Munich's German head coach Julian Nagelsmann and Bayern Munich's French defender Lucas Hernandez celebrate after the German Cup first round football match FC Viktoria Koeln vs FC Bayern Munich in Cologne, western Germany, on Aug 31, 2022. (INA FASSBENDER / AFP)

They did bounce back in midweek with a 5-0 demolition of third-tier Viktoria Cologne in their German Cup first round on Wednesday with coach Julian Nagelsmann rotating his squad.

He now has even more options with Leon Goretzka scoring in the Cup on his comeback from injury.

"We are trying to bring all players to one level so that we can choose and change accordingly," Nagelsmann said. "I want to pick and choose things from players without having any drop off in performance."

Bayern is obviously favorites against Union, having expanded their attacking options following the departure of top scorer Robert Lewandowski.

With 26 goals in six games across all competitions so far this season few would bet against their awe-inspiring attack that includes Sadio Mane, Jamal Musiala, Leroy Sane, Serge Gnabry, Thomas Mueller and Mathys Tel.

But Union, who has yet to beat Bayern in the Bundesliga, hope their own fairytale run continues.

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"You have the impression that it's a bit of a fairytale and I need to pinch myself now and again," Union sports director Oliver Ruhnert told SportBild magazine.

"There were a lot of people who said that after our promotion (in 2019) there would be a year of holiday and then we'd go straight down again."