I believe it's the worst ODI collapse ever. Test match wise I still think Englands collapse at Adeliade Oval, 9/70, ranks up there with some of the worst. From memory the best, by ecconomy, would be the 3-wicket hauls/over with another in the next which usually seem to float around the 3 or 4/15-ish. Edit: I just checked, and the game which gave birth to the Ashes wasn't much worse (England collapsed 9/77). Edit 2: And just for reference, test match collapses seem to float around the <3-5>/ results when it comes to absolute worst based on ecconomy of the collapse.