If Chelsea manages to overtake Manchester United and win its third straight Premier League title, the team will have Arsenal to thank for it.
Thierry Henry's injury-time goal gave Arsenal a 2-1 win over United on Sunday, keeping second-place Chelsea firmly in the title race - a position the Blues might not have imagined after its 2-0 loss at Liverpool on Saturday.
"This win will open (the race) up for everybody - though us a bit less, and Liverpool also," Arsenal manager Arsene Wenger said.
"With 10 minutes to go, United may be champions but you can't say that now; it's more open again," he said.
United leads the league with 60 points, six more than Chelsea.
Liverpool is third with 46 points, followed by Arsenal with 45.
For Arsenal, its first season sweep over United since 2002 came in dramatic fashion and will go a long way to ease the pain if United manages to hold on for its first league title since 2003.
"You cannot expect anything better - to play against Manchester United and be 1-0 down and come back like that right at the end and win the game," Henry said.
Arsenal beat United 1-0 at Old Trafford on September 17.
United controlled the match early in front of 60,128 spectators at the Emirates Stadium and was rewarded in the 53rd when Wayne Rooney scored his eighth goal to give the Red Devils the lead. It was Rooney's first goal since a 3-1 win over Manchester City on December 9.