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London: England's Champions Trophy hopes hang in the balance after Kumar Sangakkara's imperious century led Sri Lanka to a seven-wicket victory at The Oval.
Sangakkara's unbeaten 134, aided by a 30-ball half-century from Nuwan Kulasekara, took Sri Lanka to their target of 294 with 17 balls to spare.
Earlier, fifties from Alastair Cook, Jonathan Trott and Joe Root - on the day he received a public apology for being punched by David Warner - seemed to have England well placed on a good batting wicket
Ravi Bopara made 33 not out from 13 balls, clubbing 28 from the final over to carry the hosts to an imposing 293-7.
Australia, the fourth team in the group have one point.
The two semi-final spots will be determined after the last round of matches when England take on New Zealand in Cardiff on Sunday and Sri Lanka clash with Australia at the Oval on Monday.
Left-handed Sangakkara, cheered on by a big Sri Lankan contingent in the packed stands, anchored the chase with his 15th one-day hundred that was studded with 12 boundaries.
Pinch-hitter Nuwan Kulasekara, who was sent in at the fall of the third wicket, hit a quickfire 58 not out during a match-winning partnership of 110 from 71 balls with Sangakkara.
Kulasekara, who had two previous one-day half-centuries to his credit, plundered five fours and three sixes that demoralised the England attack.
Sri Lanka's reply began badly when Kusal Perera fell in the third over, caught at mid-on for six while attempting a big shot off the wily Anderson.
Sangakkara then put on 92 for the second wicket with Tillakaratne Dilshan and 90 for the third with Mahela Jayawardene to leave Sri Lanka well-placed on 187-2 in the 36th over.
Earlier, England's total revolved around Jonathan Trott's 76 and Joe Root's 68 off 55 balls after Sri Lanka won the toss and elected to field under overcast skies.
Skipper Alastair Cook chipped in with 59 and Ravi Bopara smashed 28 runs from the final over after Sri Lanka grabbed four wickets for five runs towards the end to make it 254-7 in the 48th over.
Bopara boosted the total with three sixes, two boundaries and a two in the 50th over sent down by seamer Shaminda Eranga to return unbeaten on 33 off 13 balls.
Root, the victim of what England cricket authorities said was an "unprovoked physical attack" by Australian batsman David Warner in a Birmingham bar over the weekend, hit five fours.
Cook, dropped twice by the normally agile Dilshan, put on 48 for the first wicket with Ian Bell and 83 for the second with Trott.
England, who were 131-2 in the 29th over, picked up their scoring rate when Root arrived at the crease and reached 201-2 at the end of 40 overs.
Earlier, Sri Lanka have won the toss and decided to bowl first.
Only one change for Sri Lanka with Nuawn Kulasekara coming in for Thisara Perera. In England Graeme Swann comes back for James Tredwell.
Teams:
England: Alastair Cook (Capt.), Ian Bell, Jonathan Trott, Joe Root, Eoin Morgan, Ravi Bopara, Jos Buttler (wk), Graeme Swann, Tim Bresnan, James Anderson, Stuart Broad
Sri Lanka: Tillakaratne Dilshan, Kushal Janith Perera, Kumar Sangakkara (wk), Mahela Jayawardene, Dinesh Chandimal, Angelo Mathews (Capt.), Lahiru Thirimanne, Nuwan Kulasekara, Rangana Herath, Shaminda Eranga, Lasith Malinga
Brief scores
England 293 for 7 (Trott 76, Root 68, Cook 59)
Sri Lanka 297 for 3 (Sangakkara 134*, Kulasekara 58*)
Result Sri Lanka won by seven wickets
MOM Kumar Sangakkara (Sri Lanka)
Points Sri Lanka 2, England 0
