Who Has the Fastest Serve? (Bringing the Heat)

Wiki.Answers.com says this about the fastest tennis serve:

Q: What is the fastest tennis serve on record?

Answer: Andy Roddick holds the fastest serve record at 155 mph (249.4 km/h) during a Davis Cup semi-final match against Vladimir Voltchkov in 2004. This beat his previous record of 152 mph (244 km/h) achieved earlier the same year.

Bill Tilden had a serve timed at 163.3 mph (262.8 km/h) in 1931. He holds the record for the fastest unofficial tennis serve, but it is questioned because of the limited technology, mathematical calculations and use of smaller wood racquets, at the time.

Best
Gary