9:05 AM PT -- MLB is lashing out against Alex's lawsuit -- calling it "nothing more than a desperate attempt to circumvent the Collective Bargaining Agreement."
MLB adds, "While we vehemently deny the allegations in the complaint, none of those allegations is relevant to the real issue: whether Mr. Rodriguez violated the Joint Drug Prevention and Treatment Program by using and possessing numerous forms of prohibited performance-enhancing substances, including Testosterone and human Growth Hormone, over the course of multiple years and whether he violated the Basic Agreement by attempting to cover-up his violations of the Program by engaging in a course of conduct intended to obstruct and frustrate the Office of the Commissioner's investigation.”
A-Rod has come out swinging by filing a lawsuit against Bud Selig and MLB, claiming they paid off the star witness against the Yankee slugger ... paid him millions of dollars to help force A-Rod out of baseball.
The suit claims Selig and MLB paid $5 million to Anthony Bosch, head of the Biogenesis Clinic -- the place A-Rod allegedly went to in order to obtain undetectable steroids.
The upshot -- A-Rod believes the testimony is tainted by the hefty price tag.
The suit claims A-Rod has been unfairly targeted for a 211-game suspension -- which A-Rod's lawyer claims is a witch hunt.
The suit claims Selig and MLB interfered with A-Rod's contracts and business relationships.
Sources connected with A-Rod tell TMZ he's been tested for performance enhancing drugs 11 times since 2011 and they've come up clean every time.