5 things we learned in the Bundesliga

Berlin - Bayern Munich enjoyed a red-letter day as its rivals lost, Naby Keita's collapse worries RB Leipzig and Borussia Dortmund suffers a Champions League hangover.

Here are five things we learned from the Bundesliga this weekend:

Bayern on cloud nine

Bayern Munich capped a red-letter day with a 3-0 win against Eintracht Frankfurt which left it 10 points clear and on course to claim a fifth straight title.

Despite a mediocre performance, Bayern's plight was helped by nearest rivals RB Leipzig and Borussia Dortmund losing.

"We won and the others missed out on taking points," Germany forward Thomas Muller said. "We didn't play well enough, but yet we're floating on cloud nine."

It seems to be just a matter before Bayern ends all mathematical doubt and wins the league.

The Bavarian giants hold the record for the quickest confirmed league win when they won the 2013-14 title on March 25, 2014 - with seven games to spare.

Cancer-survivor Russ' league return

Despite his team's defeat, Eintracht Frankfurt defender Marco Russ had something to celebrate in Munich as he came off the bench for the last 25 minutes for his first Bundesliga appearance since battling cancer last year.

A routine blood test revealed Russ had a malignant tumour.

The 31-year-old made his comeback for the final two minutes of Frankfurt's German Cup win over Bielefeld last month, but on Saturday made his first league appearance since May 19.

"It's good that he has tasted the Bundesliga air again. He has earned it," said Frankfurt's manager Bruno Huebner.

Dortmund's Champions League hangover

Despite Wednesday's 4-0 win over Benfica, Borussia Dortmund suffered another Champions League hangover by losing 2-1 at Hertha Berlin.

Dortmund's Pierre-Emerick Aubameyang cancelled out Salomon Kalou's early strike with his 22nd league goal of the season before Marvin Plattenhardt smashed home Hertha's second-half winner.

This was the third time Dortmund has lost following a European match this season.

Dortmund crashed 2-0 to Leverkusen last September after a 2-2 draw with Real Madrid, then went down 2-1 in Frankfurt last November after its record 8-4 romp against Legia Warsaw.

"Perhaps it's just coincidence, but the result is very annoying," coach Thomas Tuchel admitted in Berlin.

Keita's collapse

There were worrying scenes following RB Leipzig's 1-0 defeat to Wolfsburg when Guinea midfielder Naby Keita collapsed in the dressing room area.

Having played the 90 minutes, the 22-year-old Keita lost consciousness shortly after leaving the dressing room and was taken to hospital once his condition was stabilised.

The club says he is thought to have suffered a circulatory collapse brought on by exertion.

"His test results were all okay, that is why we have to look at what was the cause," said Leipzig's coach Ralph Hasenhuettl.

Weiser's dramatic drop

Hertha Berlin's midfielder Mitchell Weiser took no end of ribbing on social media after theatrically dropping to the turf after a clash with Dortmund's Ousmane Dembele shortly before the final whistle.

Both players were booked for the incident - which means Dembele is suspended for his next game for a fifth yellow card - while Weiser was left clutching his left ankle.

Pundit and ex-referee Thorsten Kinhoefer accused Weiser of play-attacking and the ex-Bayern midfielder was the subject of several mocking tweets under the ironic hashtag #GetWellSoonMitch.

But Hertha posted a picture of Weiser's badly marked ankle and Hertha coach Pal Dardai defended his player.

"There's no two ways about it. He (Dembele) kicked his (Weiser's) standing leg and he's lucky he didn't land in hospital," said Dardai.

(Photos courtesy: Action Images)