Premier League leaders Chelsea travel to Old Trafford on Sunday to take on Manchester United and their two-time former manager Jose Mourinho.
Here, we pick out the key numbers behind the story.
The two teams will battle again on Sunday (John Walton/Empics)
50 – this will be the 50th time the sides have met in the Premier League, Chelsea winning 17 and United 13 with 19 draws.
12 – number of matches since United have won the fixture, in all competitions, dating back to October 2012.
56.25 – percentage of matches United have drawn at home in the Premier League (nine from 16).
Jose Mourinho's side are struggling at home (PA Graphics)
68.75 – percentage of away matches Chelsea have won in the Premier League (11 from 16).
19 – difference between Chelsea’s goals scored this term (65) and United’s (46).
17 – the tally of the top scorers from each team, Zlatan Ibrahimovic and Diego Costa.
Zlatan Ibrahimovic has been a regular goalscorer ( Richard Sellers/Empics)
13 – clean sheets by Chelsea, just one more than the Red Devils.
18 – Chelsea’s points cushion over United in the table.
16 – United’s points cushion over Chelsea at the end of last season.
Culled from dailymail.co.uk