In 1994, the
Minnesota Twins drafted Walker with the 8th pick in the 1st Round of the amateur draft. On August 30, 1996, Walker made his major league debut with the Twins. In 1998, Walker became the starting second baseman for the Twins, hitting .316 with 12
HR, 62
RBIs, and a career best 19 stolen bases. Over the next season and a half, Walker's offensive performance began to decline, and the Twins traded Walker to the
Colorado Rockies. He responded by hitting .316 through the rest of 2000 and .297 through the first half of 2001. Walker hit 12 home runs as a member of the Rockies that year. The
Cincinnati Reds, in need of a better performance from its second base position, traded for Walker in July 2001. Walker rewarded the Reds by providing consistent offense, hitting .295 through the end of the season. In 2002, Walker enjoyed another fine year, hitting .299 with 11 HR and 64 RBIs and setting career highs with 42 doubles and 155 games played. Following the season, the
Boston Red Sox hired
Theo Epstein as their new general manager. One of his first moves was trading for Walker. During 2003, Walker continued to provide consistent offense, hitting .283 with 13 HR and setting a career high with 85 RBIs. On September 23 that year, with the Red Sox trailing the
Baltimore Orioles 5-2 in the ninth inning, Walker hit a two-out, two-strike, three-run home run off
Jorge Julio to tie the game. (The Sox won, 6-5, on
David Ortiz's walk-off home run in the tenth.) The Red Sox made the playoffs and Walker stepped up his performance again; he hit .313 with three homers in the
American League Division Series against the
Oakland A's, and .370 with two more homers and hits in every game against the
New York Yankees in the
ALCS. The Red Sox were eliminated in 7 games. Walker's five postseason homers are still a Red Sox record. Despite his performance, Walker was allowed to leave, signing with the
Chicago Cubs via free agency. Over the next three seasons, Walker attempted to maintain his offensive performance with the Cubs, but found himself playing less and platooning with younger players. Walker hit .274 (2004), .305 (2005), and .277 (through July 2006). However, he began to share time at second base with other players like
Neifi Pérez, and started to make appearances at
first base and in the
outfield. At the end of July 2006, the
San Diego Padres were attempting to make the playoffs while the Cubs were already out of the race. Before the non-waiver trade deadline, the Padres traded low-A pitching prospect
José Ceda to the Cubs for Walker, who became the new starting third baseman. He hit .282 down the stretch and the Padres made the
playoffs, but were eliminated in the first round by the
St. Louis Cardinals. In 2007, Walker attended
spring training with the Padres. However, during the offseason, the Padres had restocked the team with more infielders and left-handed hitters and, after a poor performance during the exhibition season, Walker was released on March 27. On March 30, he signed with the
Oakland Athletics. On May 12, Walker was
designated for assignment to make room for
Dallas Braden, and subsequently released. ==Career statistics==