6. Sammy Sosa

Although he finished his career in 2004 with the Cubs, he was still a major impact player in the early part of the decade. His best season of the decade was 2001 when he hit .328 with 64 home runs and 160 runs batted in, part of a five-year stretch in which he averaged 58 home runs a season. He was traded to the Orioles following the 2004 season. (Jonathan Daniel/Getty Images)