United 4/7 After Late Show
Manchester United were cut into a best of 4/7 after opening a six-point lead in the Premier League title race by edging out rivals City 3-2 in a thriller.
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United blew a two-goal lead but Robin van Persie grabbed all three points for them with a deflected, injury-time, free-kick winner.
It condemned City to their first home defeat in the league for two years and opened up a six-point gap at the top of the table - United's biggest lead so far this season.
Several firms offer United at 4/7 - they were out at 11/4 for a time earlier in the season - perhaps wary that City will not have European football to worry about come February.
Coral, however, are prepared to lay City. They offer a best of 9/4 about the defending champions.
Sky Bet's Paul Lowery, whose firm go 8/15 about United's chances, said: "United have put a major dent in City's chances and six points will be tough to overhaul heading towards the halfway stage of the season.
"8/15 is the shortest United have been all season and the derby win will gave them great momentum heading into a busy festive calendar."
With City now out of the Champions League and off the pace in the Premier League, Roberto Mancini was cut in the sack race market.
Coral cut his odds from 7/1 to 9/2, with Ladbrokes going the same price. Sunderland boss Martin O'Neill remains the favourite.
Mancini is odds-on at 4/6 to have left the Etihad Stadium before the start of next season with Coral.
Their Tim Reynolds said: "Having gone crashing out the Champions League midweek and now losing to rivals United, questions are surely going to be asked about Roberto Mancini's position at the Etihad Stadium.
"If City fail to successfully defend their Premier League title, Mancini could easily find himself looking for another job."
William Hill, however, go evens about Mancini lasting until next August's big kick-off.
Paddy Power refunded several markets due to Van Persie scoring. They had vowed to hand cash back if the Dutchman scored in the game.
Meanwhile, Everton went fourth in the table with a 2-1 victory over Tottenham but can still be backed at 9/2 (BetVictor) to finish in the top four.
Tottenham slipped back behind the Toffees after two late goals saw the visitors' 1-0 lead disappear.
Spurs are 6/4 (bet365) to emulate last season's top-four finish but it's Arsenal are leading the race for what appears to be fourth spot. They are even-money shots with BetVictor after Saturday's 2-0 win over West Brom. That result means they are now just two points off fourth.
Liverpool also won on Sunday - 3-2 at West Ham - and although they are in 10th place they are just four points behind Everton.
The improving Reds can be backed at 5/1 (general) to finish in the top four.
Third-placed Chelsea have stuttered of late but they are 1/5 for a top-four spot having won 3-1 at Sunderland on Saturday.