The estranged wife of Orioles closer Mychal Givens claims the pitcher has abused her and made her life "a living hell" over the past 15 months ... and TMZ Sports has learned the MLB is aware.
Mychal, however, tells us the allegations are false ... and vehemently denies the claims.
Tiffani Givens -- whom Mychal has children with -- says on several occasions over the last year the MLB player has stalked her, sent her abusive messages and stole from her.
Tiffani -- who married Mychal in 2014 but is in the process of divorcing the pitcher -- spelled out a lot of the allegations in several Facebook posts .