Berdych racked up his third victory of the weekend with his 6-3, 6-3, 6-4 defeat of Berlocq as the Czechs rolled up an insurmountable 3-1 advantage at Buenos Aires.
The victory put the Czechs into the Davis Cup finals against Spain, which advanced over the United States Sunday.
Defending champ Spain defeated the Czech Republic in the 2009 finals.
Argentina was playing without Juan Martin del Potro, who was out with a wrist injury. He had defeated Stepanek in a Friday singles match.
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