PHILADELPHIA (AP) A person familiar with the trade says the Philadelphia Phillies have agreed to trade All-Star closer Jonathan Papelbon to the Washington Nationals.

The person spoke to The Associated Press on condition of anonymity Tuesday because the deal has not been finalized. MLB.com reported the Phillies will receive Double-A right-hander Nick Pivetta for Papelbon.

The 34-year-old right-hander is Philadelphia's career saves leader with 123 and is 17 for 17 in save chances this season. Papelbon also is Boston's saves leader with 219.

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Drew Storen is 29 for 31 in save opportunities for the NL East-leading Nationals. He's likely moving to a setup role because Papelbon made it clear he wouldn't accept a trade unless he was going to remain the closer.

The Phillies are a major league-worst 37-63. They signed Papelbon to a $50 million, four-year deal in November 2011.