It was also the first time in four years that Lopez reached the semi-finals at The Queen's Club and his first appearance in the last four of an ATP World Tour event since last year's Swiss Open tournament at Gstaad.
Lopez will next meet another Czech, number 15 seed Radek Stepanek, who followed up his victory over 2013 champion Andy Murray by defeating seventh seeded South African Kevin Anderson 1-6 6-3 6-2.
(Reporting by Tim Collings, editing by Pritha Sarkar)
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