The suit claims that Yankees physician Dr. Christopher Ahmad and New York Presbyterian Hospital mishandled his medical care during the 2012 American League playoffs.
Rodriguez's lawyers claim that an MRI exam on Oct. 11, 2012, revealed an injury to his left hip joint but Ahmad cleared him to continue playing, which caused Rodriguez "great pain."
The Yankees said at the time that Rodriguez complained of a problem with his right hip, not the left one.
Rodriguez, who is in grievance hearings related to his 211-game suspension, also sued Major League Baseball on Thursday, claiming it paid Biogenesis founder Anthony Bosch $5 million help force Rodriguez out of the game.
The suit names commissioner Bud Selig as a defendant.
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Two-time Cy Young Award winner Johan Santana is throwing, six months after having surgery to repair a re-tear of the anterior capsule in his left shoulder.
Santana, who was injured in 2012 and missed the entire 2013 season because of the surgery, wrote on Twitter that he is progressing.
"Very happy to move to the next phase of my rehab! Throwing!!!! So far, so good!!!" he wrote.
Santana will likely be a free agent this winter. The New York Mets are expected to pay him a $5.5 million buyout instead of a $25.5 million option for next year. However, the Mets said they may be interested in bringing him back at a discounted rate.
The 34-year-old left-hander will probably settle for a one-year contract loaded with incentives.
Santana is 139-78 with a 3.21 ERA in 284 career starts.
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