The WBC features more than 400 players from 16 countries competing in the event, which will run March 3-20, with the semifinals and final slated at PETCO Park in San Diego.
"It's a real honor to be chosen to represent the US for the WBC," said Winn. "I'm really excited and looking forward to the opportunity to challenge the other countries."
Winn had strictly been an American Leaguer for six seasons, playing for Tampa Bay and Seattle, but when acquired in a midseason trade with the Mariners for catcher Yorvit Torrealba and pitcher Jesse Foppert, Winn made the transition to the new league a smooth and powerful one.
Winn, returning to his Bay Area roots, hit .359 for the Giants over 58 games, clubbing 14 homers and driving in 26 runs, while adding a .680 slugging percentage and a .391 on-base percentage.
Asked to explain his phenomenal final month, Winn replied he "only looks at the whole season -- it always averages out."
Talk about way above average, Winn's total of 11 homers in September was matched by only Houston's Lance Berkman, Cleveland's Travis Hafner and Boston's David Ortiz, and his highlight-reel season included hitting for the cycle on Aug. 15 at Cincinnati, becoming only the eighth San Francisco player to accomplish the feat.
Countries participating in the WBC are: Pool A -- China, Chinese Tapei, Japan, Korea; Pool B -- Canada, Mexico, South Africa, U.S.; Pool C -- Cuba, the Netherlands, Puerto Rico, Panama; Pool D -- Australia, Italy, Dominican Republic, Venezuela.
Winn will be playing against his Giants teammates when the U.S. squad squares off at Scottsdale Stadium in a March 5 exhibition match. The U.S. will also play South Africa in a WBC clash there on March 10.
The Giants are expected to sign Winn to a multiyear contract in the near future.