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The Mets clinched the team’s first World Series appearance since 2000 by beating the Chicago Cubs 8-3 in Game 4 of the N.L.C.S.

Despite it not being a save situation, Jeurys Familia came in for his eighth appearance of the postseason and allowed a walk in a scoreless inning to finish the Cubs off. He has not allowed a run in 9 2/3 innings this postseason after a terrific regular season in which he had a 1.85 E.R.A. in 78 innings.

The win, powered by an offensive explosion to start the game, gave the Mets a sweep in the series. Lucas Duda was the star of the day with 5 R.B.I. and Daniel Murphy homered for the sixth consecutive postseason game, setting a major league record.

The World Series is scheduled to begin on Tuesday, Oct. 27. The Mets will face the winner of the A.L.C.S. between the Kansas City Royals and the Toronto Blue Jays.