Marcos was beaten in the second round of the Swiss Indoors Basel on Tuesday, losing to red-hot Argentine Juan Martin del Potro 6-1, 6-2.
Del Potro has been one of the form players on the ATP World Tour in recent weeks, winning the Tokyo title and beating World No. 1 Rafael Nadal to reach the Shanghai final. He was in the same blistering form against Marcos, breaking serve four times and saving all five break points he faced.
Marcos is next due to compete at an ATP Challenger Tour event in Bratislava, beginning the week of 4 November.
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