Mertinak and Karol Beck edged the tie-break 7-5 to take the first set and then took the second, despite Argentina opening with a break.
BBC: SPORT | Tennis | Underdogs seize Davis Cup leads
In the other semi-final, Slovakia's Michal Mertinak and Karol Beck upset Argentina's Mariano Puerta and David Nalbandian 7-6 7-5 7-6 to go 2-1 up.
At the World Tennis Tournament in the Dutch city of Rotterdam, Argentinian third seed Juan Martin Del Potro -- the 2009 U.S. Open champion -- beat Slovakian Karol Beck 6-4 7-5 to reach the last eight.
CNN: Monfils pulls out as Roddick battles through in San Jose
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