Riggleman is Washington's new bench coach, Grissom is the first-base coach, and Listach the third-base coach. Rick Eckstein, older brother of 2006 World Series MVP David Eckstein, will be the hitting coach, and Randy Knorr the bullpen coach.
Friday's hirings replace five members of manager Manny Acta's staff who were fired on the last day of the regular season. The Nationals went 59-102, the worst record in the majors.
Pitching coach Randy St. Claire remains on the staff.