I doubt it was originally described that way... it is a reference to the U.S. victory over Russia for Olympic gold in ice hockey, dubbed "Miracle on Ice" (and I thought *that* was a martini). From the cbc website:

Thirty years before a bunch of American college hockey players stunned the powerful Russians at Lake Placid, the U.S. soccer team pulled off the greatest upset in World Cup history when it defeated England. Late in the first half, Walter Bahr launched a long-range shot on the English net. Joe Gaetjens dove headlong and made enough contact with the ball to send it past the reach of the goalkeeper and into the back of the net. The U.S. went on to beat England 1-0 in the "Miracle on Grass."

>Ah yes. I'd never heard the expression though.
>
>>U.S. over England in the 1950 World Cup. More of a fluke than a miracle, but it still happened. "You could look it up," to quote the noted American philosopher Casey Stengel.
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>>>Say what?
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>>>>1950 Miracle on Grass?
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>>>>
>>>>>>Figure the odds on the U.S. beating England in soccer (I don't think there are many 'Miracles on Grass' in one lifetime)? We stand a better chance at wrestling :0) I think it was meant as a compliment on your debating skills... :o)
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>...