One of the greatest pitchers in the history of the New York Yankees is stepping up to the plate for an iconic New Yorker. Legendary closer Mariano Rivera endorsed former President Donald Trump in the 2024 election on Monday, according to The Denver Gazette. The baseball Hall of Famer was speaking on WABC’s “Sid & Friends in the Morning” Monday radio broadcast. Rivera cited his own personal friendship with Trump — which precedes the billionaire’s entrance into presidential politics. “President Trump, he’s my friend,” Rivera said. 🚨 JUST IN: Legendary New York Yankees Pitcher Mariano Rivera say…