The Washington Times - July 13, 2009, 08:38AM

Jim Riggleman is the Nationals’ new manager and will be introduced as Manny Acta’s replacement later this morning, according to a club source.

A news conference is tentatively scheduled for 11 a.m. today at Nationals Park, at which time team president Stan Kasten and acting general manager will introduce Riggleman as Washington’s third manager in five seasons.

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Acta was fired late Sunday night after the Nationals team charter arrived back in the District following a 5-0 loss in Houston. The 40-year-old was 158-252 in 2 1/2 seasons as manager. Washington enters the All-Star break with the majors’ worst record at 26-61.

Riggleman, 56, has managed parts of nine seasons with three previous major league clubs and owns an overall 522-652 record. He went 112-179 with the Padres from 1992-94, 374-491 with the Cubs from 1995-99 (winning the NL wild card in 1998) and 36-54 as the Mariners’ interim manager last season.