keywords: roddick voltchkov record serve mph
text: Roddick Smacks Voltchkov With a Record 155mph Serve Fireballing American Andy Roddick improved his service serve mark blasting a record 155 mph serve in a 6-1, 6-4, 6-4, win over Vladimir Voltchkov Friday earning the United States a 1-0 early lead lead over Belarus in the Davis Cup semifinals World Group.