(MENAFN- Kora) A day after top seed and defending champion john isner was beaten in houston three more seeds were sent packing in the second round of the atp 250 event.the bottom half of the draw is now also wide open after the shock results.
Santiago giraldo crushed spanish second seed robredo 6-3 6-4 in just one hour and 19 minutes.
Giraldo will face alejandro gonzalez in an all-colombian quarter-final after the world number 79 benefitted from a retirement.
Gonzalez was on court for just 46 minutes leading feliciano lopez 6-3 2-0 when the spanish fifth seed retired.
Monaco the 2012 champion and argentine sixth seed was beaten 6-7 (4-7) 6-4 6-3 by american left-hander donald young.
Young was a break down in the third set but recovered from a 2-0 deficit to win six of the final seven games.
There was some good news for two spaniards on thursday.
Fourth seed fernando verdasco overcame american wildcard steve johnson 6-0 4-6 6-3 to set up a meeting with young.
Nicolas almagro the third seed and last year's runner-up was a comfortable 6-2 6-3 winner over american michael russell.
American jack sock also advanced to the last eight after a 6-4 6-3 win over german benjamin becker.
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