keywords: roddick sharapova fastest serve tournament
text: Roddick Blasts Through, Sharapova Struggles  NEW YORK (Reuters) - Defending champion Andy Roddick  unleashed the fastest serve in U.S. Open history on his way to  a 6-0, 6-2, 6-2 demolition of Scoville Jenkins Tuesday as Maria  Sharapova's tournament was almost ended at the first stage.