Manny Ramirez -- Florida Mansion Targeted by Former Workers

Manny Ramirez allegedly whiffed bigtime when it came to paying the people who tricked out the yard at his Florida mansion ... and now THREE companies have each obtained liens against the place in an effort to get paid.

TMZ has obtained official records, which show Manny and his wife owe more than $20,000 in back pay to three different home improvement companies that worked on Manny's pool cabana, outdoor landscaping and more.

All three companies -- which claim they worked on the house this past year -- have obtained liens in Florida ... which means, if Manny doesn't pay up, they could force the former MLB star to sell the house to repay the debt.