Chelsea and Manchester United meet at Stamford Bridge on a Sunday in one of the biggest football betting events of the Premier League calendar.
Although there are still five months of the current campaign remaining, the Blues face a crucial festive period which could define their season after a spectacular loss of form in recent weeks.
Bookmaker Sky Bet have seen Chelsea slip from odds-on favourites to 2/1 shots with United edging ahead in the betting at 6/4 to regain the title.
Ahead of Sunday's match the online betting firm make United 5/2 to win at Stamford Bridge for the first time since 2002, but 23/20 shots Chelsea have only lost once at home all season.
The Blues have only conceded four times at home this term, but all of those have come in their last two matches. If Carlo Ancelotti's men cannot find a win here it will be the first time for two years that they have failed to win three home matches in a row.
A draw at 9/4 looks the most likely result, with the Blues keen to avoid a defeat that could see United open up a decent gap at the top of the table.
The match could hinge on the form of two out-of-form superstars, as Wayne Rooney and Didier Drogba face each other for the first time in a year.
Rooney missed Chelsea's 2-1 win at Old Trafford towards the end of last season, so he will be desperate to make amends.
On that occasion, the Ivory Coast international came off the bench to notch the winner which practically secured the title for the Blues.
Drogba is 9/2 with Sky Bet to open the scoring for Chelsea and 5/4 to find the net in 90 minutes, while Rooney is 11/2 to bag first and a 6/4 anytime scorer chance.
Punters who think both players will get on the scoresheet can back the pair at 11/2.
Both payers missed penalties last weekend and Sky Bet are offering a tongue-in-cheek market on them to recover from their spot-kick woe on Sunday.
The 'Spot of luck' market offers odds of 33/1 that both players will score a penalty on Sunday, which could have a big impact on this titanic clash.
Sky Bet have more than 50 markets for Sunday's showdown, bet now.