* Wall Street extends losses after Supreme Court decision

* Euro zone deeply divided over how to battle debt crisis

* Coming up: U.S. consumer confidence survey, Friday

By Gene Ramos

NEW YORK, June 28 (Reuters) - Crude oil futures fell as much as 3 percent o n T hursday, heading for the worst quarterly performance since the 2008 financial debacle, on worries that an EU summit will not find durable solutions to the euro zone crisis, stifling global growth prospects.

Weaker U.S. equities on Wall Street after the U.S. Supreme Court decision upholding key elements of President Barack Obama's healthcare reform law added to the day's pressures on crude futures.

Despite recent gains, Brent crude futures were on track to end the second quarter with a drop of about 25 percent, the worst since the last quarter of 2008, at the height of the financial crisis after the collapse of Lehman Bros.

U.S. crude futures, meanwhile, were poised to see a fall of about 24 percent, also the biggest quarterly loss since the last quarter of 2008.

Trading on Wall Street was volatile, with healthcare stocks hit after the Supreme Court upheld the centerpiece "individual mandate" provision of the Obama healthcare overhaul. Equities were already lower on skepticism that the European Union Summit will result in concrete measures.

"It's the euro zone problems, the strength of the dollar and the weak equities, said Stephen Schork, president of the Schork Group in Villanova, Pennsylvania, commenting on the reasons for the day's price drop.

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UPDATE 9-Oil heads for worst quarter since 2008 crisis