LONDON—The United States won a doubles five-setter against Spain on Saturday to maintain its chance of reaching the Davis Cup final against either Argentina or Russia.

Mike Bryan and Mardy Fish beat Fernando Verdasco and Feliciano Lopez 4-6, 6-4, 6-3, 4-6, 6-4 on clay in Madrid to cut the Spaniards’ match lead to 2-1 and ensure the semifinal result depends on today’s reverse singles.

Bryan usually plays doubles with his twin brother, Bob. But he pulled out with a shoulder injury and Fish was a late replacement.

“Obviously it was a little worrisome. But we fi...

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