The Washington Nationals set up a news conference before Saturday's home game, and are expected to announce Frank Robinson will not return as manager in 2007. Robinson has managed the Expos-Nationals franchise the past five seasons. The club entered Saturday's game against the New York Mets with a 71-89 record, assured of finishing last in the NL East for the third consecutive season. The regular season ends Sunday. The 71-year-old Robinson is in his 16th season as a manager for four clubs. He was the first black manager in the major leagues. He is a Hall of Famer who ranks sixth in baseball history with 586 homers.