By Andrew Gould Left-handed relief pitcher Tony Watson announced his retirement on Monday. The 36-year-old southpaw confirmed his exit to The Athletic’s Stephen J. Nesbitt with a statement expressing gratitude to his family, friends, teammates, coaches, and four former MLB organizations. “Thank you to all my teammates, peers, coaches, and support staff for all the cherished memories along the way, for providing support to keep me on the field, and experiences that will last a lifetime,” Watson said. “Thank you to the Pirates, Dodgers, Giants, and Angels organizations and their fans for the sup…