Free-agent reliever Casey Janssen and the Washington Nationals agreed to a one-year contract with an option for 2016, a person familiar with the negotiations said Wednesday. The move is an attempt by the Nationals to add late-game relief help to their bullpen following the trade that sent eighth-inning setup man Tyler Clippard, a two-time NL All-Star, to the Oakland Athletics for infielder Yunel Escobar. Shortly after that swap this month, Washington general manager Mike Rizzo said he felt the reigning NL East champions would be able to find a substitute for Clippard without adding anyone new to the organization. ''We feel we have the internal replacements to have a quality bullpen in 2015.'' But the Nationals also had lost relievers Rafael Soriano and Ross Detwiler since the end of last season, and while Drew Storen is the incumbent as the closer, Janssen has plenty of late-game experience. More...