Mike Jacobs mashed 32 home runs for the 2008 Marlins, but now he may be best remembered one day as the first player to test positive for human growth hormone. His failed test is the first announced by Major League Baseball since it began conducting blood tests for HGH for minor league players. Jacobs, who plays first base for the Rockies' Triple-A Colorado Springs affiliate, will begin serving a 50-game suspension immediately.

The 30-year-old Jacobs signed a minor league deal with Colorado last December, and he batted .298/.376/.534 with 23 homers in 429 at-bats in Triple-A this season. His production had trended up after the all-star break (1.056 OPS since July 14, compared with .867 before) as Colorado Springs enjoyed two lengthy homestands in its hitter-friendly park.

Jacobs burst on the scene in 2005, slugging 11 homers in 30 games for the Mets after a late-August callup. That offseason, New York packaged the 25-year-old slugger in a deal for the Marlins' Carlos Delgado, and Jacobs enjoyed his best years with Florida, batting .258/.314/.483 (105 OPS+) over 1,499 plate appearances.

Jacobs qualified for arbitration following the 2008 season, so the Marlins hurriedly traded him to the Royals for Leo Nunez, Florida's current closer. Kansas City non-tendred Jacobs following the ’09 season, and since then he's bounced from the Mets to the Blue Jays to the Rockies on minor league deals.

Postscript: Just hours after MLB announced Jacobs' suspension, the Rockies released the veteran first baseman. (Hat tip to MLB Trade Rumors.) Jacobs must serve the entirety of his 50-game suspension if he latches on with another organization.