Damn. You weren't riding Bridge Ave. west across the Rio Grande in Albuquerque, were you?
Just about the exact same thing happened to me Friday with my brand new Gatorskins (though I got about 20 miles on 'em before I got the cut). Damndest thing is, I couldn't find anything in the road that might've cut me... There was the core of an apple on a stick (like for caramel apples) in the road and that was about it. I had even just commented to myself about how they must've swept the streets that day as there was a lot less road crap on the way home then there was going in.