Davis Cup on Twitter: "New name in town - @rogerfederer 😉🇨🇭 #OnThisDay in 1999 Federer made his #DavisCup debut The Swiss teenager defeated Sanguinetti in four sets https://t.co/rGXdyVeD2E" / Twitter
Davide Sanguinetti of Italy chases down a forehand from Andy Roddick... News Photo - Getty Images