MLB: Nationals closer Sean Doolittle is a huge fan of bullpen carts

Nationals pitcher Sean Doolittle announces his retirement after

Sean Doolittle braved the rain by taking a ride in the Nationals

10 Reasons We'll Miss Sean Doolittle After He Leaves The Nationals

Doolittle's off-field impact was possible because of his on-field

Nationals pitcher Sean Doolittle announces his retirement after

MLB: Meet the Nationals fans who auditioned to drive the bullpen cart

The Nationals have a new bullpen cart, but most of their relievers

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Nationals Pitcher Sean Doolittle: The Closer Role Is All About

Nationals pitcher Sean Doolittle announces retirement

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