By Dan MartinOriginal Source: nypost.comThe final scene of CC Sabathia’s career was the left-hander walking off the mound at Yankee Stadium with trainer Steve Donohue, having re-injured his shoulder that helped send him into retirement.But the ending could have come sooner and in far uglier fashion, which is one of the reasons Sabathia took part in a documentary chronicling his final season in the majors.In “Under the Grapefruit Tree: The CC Sabathia Story,” which will premiere on HBO on Dec. 22, Sabathia delves deep into his battle with alcoholism and how it nearly ended his career.The 40-year-old said throughout his best seasons...click here to continue reading