Third seeded Bopanna and Kristof won 3-6, 7-6 (7), 10-8 Friday and will now play Stephen Huss of Australia and Brazilian Andre Sa in the $531,000 hardcourt event.
Huss and Sa got a walk over from Americans Andy Roddick and Mardy Fish.
The other semi-final will be a contest between American pairs -- James Blake and John Isner and Scott Lipsky and Rajeev Ram.
Blake and Isner went past Germany's Michael Kohlmann and Rainer Schuettler 6-4, 6-1 while Lipsky and Ram beat Kevin Anderson of South Africa and Michael Russell of US 7-6 (2), 7-6 (9).
(Published 24 July 2010, 12:50 IST)
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