Bundesliga leaders and defending champions Bayern Munich make their return to action at Union Berlin in Sunday's late kick-off.

The first of Europe's top five leagues to resume amid the coronavirus pandemic, Germany's top flight gets back under way on Saturday.

Bayern could see their advantage at the summit cut to just one point if Borussia Dortmund beat rivals Schalke.

Hansi Flick's side are then involved in one of two Sunday matches - before another follows on Monday.

With the help of Opta, we take a look at the key numbers from the final three fixtures of this matchweek.

Cologne v Mainz

8 - Mainz have not won on any of their eight Bundesliga trips to Cologne (D4 L4). They have not faced any other side away in the top flight as often without winning. Meanwhile, only against Eintracht Braunschweig (20 games) do Cologne have a better unbeaten home Bundesliga record.

24 - Cologne have won eight of their past 11 league games, losing only to leaders Bayern, second-placed Dortmund and fourth-placed Borussia Monchengladbach. Since matchweek 15, they have collected 24 points - trailing only Bayern (31) and BVB (25).

7 - January loan signing Mark Uth has been involved in at least one goal in each of his first seven league games for Cologne (four goals, four assists).

Union Berlin v Bayern Munich

2 - These sides are meeting in a competitive match for just the second time. Their first clash earlier this season ended in a 2-1 Bayern win in Munich.

1866 - Bayern will play their 1866th Bundesliga match, moving level with Hamburg in the all-time list. Only Werder Bremen (1890) have been involved in more top-flight games.

4 - The defending champions have a four-point lead at the top of the Bundesliga table for the first time this season. They have never thrown away an advantage this big this late in a season.

3 - Bayern have scored at least three times in each of their past five away league matches, setting a Bundesliga record.

73 - Flick's outfit have 73 goals in their first 25 league games this term. Only Bayern themselves in 1973-74 and 2013-14 (both 24) have topped that tally at this stage of a campaign.

5 - Union have five wins in their past eight home league games, keeping a clean sheet in each of these victories. However, Sunday's hosts have conceded three or more goals in four of their eight matches since the Bundesliga's mid-season break.

Werder Bremen v Bayer Leverkusen

62 - Leverkusen have scored more away Bundesliga goals at Werder than they have against any other side.

6 - Bremen have lost their six most recent Bundesliga home games, failing to score in each of their past five at home - setting a pair of unwanted club top-flight records.

21 - Werder have dropped more points from winning positions than any other side in the Bundesliga this season.

19 - Bayer have 19 points from their eight matches since the mid-season break, their joint-best ever start to a Ruckrunde (also 19 points from eight games in 1999-2000).