MILWAUKEE—In an unprecedented move, the Milwaukee Brewers fired manager Ned Yost on Monday, hoping to pull out of another late-season slump that has jeopardized the team’s chance of making the playoffs for the first time since 1982.

Third-base coach Dale Sveum will take over as interim manager for the remainder of the season. The Brewers have lost seven of eight and fallen into a tie with Philadelphia for the NL wild-card lead.

It marked the first time in major league history—except the strike-split 1981 season—that a manager was fired in August or later with his team i...

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