.118 for Iowa, and was released by the Chicago Cubs organization on June 2, 2006. Mike Downey of the Chicago Tribune, in an interview on 06/06/06, compared him to Moonlight Graham, who 100 years earlier had appeared in his only Major League game, only to not get an official at-bat, a story recounted in the film Field of Dreams. Greenberg said in the interview, "If that was the extent of my time as a baseball player, just that one very strange little moment, well, there's nothing more I can do about it." Signed by the Los Angeles Dodgers a few days later, Greenberg was assigned to the Jacksonville Suns, hitting .228, but had a .387 on-base percentage (his minor league average), as he had more walks than hits. He also hit well against lefties, with a .455 batting average, and hit .313 with runners on base. Following this stint in the Dodgers' farm system, Greenberg played for the Kansas City Royals organization. The Kansas City Royals agreed to terms with Greenberg on a minor-league contract on December 5, 2006. Greenberg played the 2007 season with the Royals' Double-A Wichita Wranglers in the Texas League. He batted .266 with a .373 on-base percentage (10th in the league), a league-leading 11 triples, 13 sacrifice hits (second in the league), 74 walks (tied for fourth in the league), and 23 stolen bases (fifth in the league) in 467 at bats, while leading the team with 73 runs scored. In December 2007, the Royals signed Greenberg to a minor league contract for 2008. Unable to gain a spot in the Triple-A Omaha Royals outfield, Greenberg was granted free agency by Kansas City. After a brief stint with the Independent Bridgeport Bluefish near his hometown of Guilford, in which he batted .289 with a .450 on-base percentage, Greenberg signed a contract with the Los Angeles Angels of Anaheim and was assigned to the Double-A Arkansas Travelers. There, he batted .271 with a .361 on-base percentage, and 16 steals in 262 at-bats. On February 23, 2009, Greenberg signed a minor league contract with the Cincinnati Reds and was invited to minor league spring training. He did not make the team in spring training, and played with the Independent League Bridgeport Bluefish. In an August 8, 2009, game, Jim Heuser's first pitch sailed behind Greenberg, who yelled out to Heuser. Greenberg was then drilled by a 2–2