Munich - It was a good weekend for the top four in the Bundesliga, as FC Bayern München, Bayer 04 Leverkusen, Borussia Dortmund and FC Schalke 04 all recorded impressive victories.

Some of the division's best-known Traditionsvereine, however, suffered heavy defeats on Matchday 20. rounds up the most intriguing statistics to emerge from the latest round of action from Germany's top flight...

FC Bayern München's win in the Bavarian Derby was their 12th league victory in a row. Although this isn't a club record, no other team has ever won 18 of their first 20 league matches. To cap a fine weekend for Pep Guardiola's team, Bayern captain Philipp Lahm celebrated his 250th league appearance for the club with his first goal in 95 matches (his last coming in December 2011).

Robert Lewandowski scored his quickest goal of the 2013/14 season so far in Borussia Dortmund's 5-1 win over Werder Bremen. In fact, the 25-year-old scored before half-time for the first time this season on Saturday - all of his other 12 Bundesliga goals this season have come after the restart.

Augsburg midfielder Andre Hahn scored his third brace of the campaign in his team's 4-1 win against Stuttgart on Matchday 20 - only Robert Lewandowski and Adrian Ramos have done so more often in 2013/14. All of the 23-year-old's nine goals have come in the last 13 league matches, while Augsburg's success at the Mercedes-Benz Arena was their highest-ever Bundesliga success.

Against Augsburg, VfB Stuttgart conceded for the 13th game in a row - the longest run of any side in the division. In total, VfB have let in 41 goals so far this season. The last time they had conceded so many goals by Matchday 20 was 39 years ago. The defeat at the Mercedes-Benz Arena on Sunday was also die Schwaben's fifth consecutive defeat, and their seventh in their last eight matches.

Hamburger SV's 3-0 defeat to Hertha Berlin was die Rothosen's sixth in a row - their longest losing run in their history. This is also the first time HSV have conceded three goals in five consecutive league encounters, while their current home record of seven defeats from ten in 2013/14 is the worst in the club's history.