(Reuters) - Top seed Juan Martin del Potro's comeback from injury ended in the quarter-finals of the Delray Beach Open following a 6-4 3-6 7-6(5) defeat by American Mackenzie McDonald.
Del Potro, playing his first tournament since he injured his knee at the Shanghai Masters in October last year, played with a heavily strapped knee on Friday. He also pulled out of next week's Mexican Open in Acapulco, a tournament he won last year.
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