Roddick improved to 2-0 at this weekend's first-round test in Santiago, rallying to defeat Capdeville 3-6, 7-6 (7-2), 6-3, 6-3 on the clay courts of National Stadium.
Roddick's win in the first reverse-singles match handed the Americans an insurmountable 3-1 lead and a date in July's quarterfinals against powerful Spain, which advanced with a win over Belgium this weekend.
The U.S. veteran racked up his 33rd career Davis Cup win, the second most all-time behind John McEnroe's 41.
The United States took a 2-1 advantage Saturday when the doubles team of Bob Bryan and Mike Bryan dispatched Chilean tandem Nicolas Massu and Jorge Aguilar 6-3, 6-3, 7-6 (7-4).
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