Juan Martin del Potro: Argentine top seed loses to Mackenzie McDonald in Delray Beach Open quarter-final

Juan Martin del Potro and Mackenzie McDonald
McDonald, right, will play in his first ATP Tour semi-final

Juan Martin del Potro's injury comeback ended with a three-set quarter-final defeat by American Mackenzie McDonald at the Delray Beach Open.

The Argentine top seed was beaten 6-4 3-6 7-6 (7-5) by the world number 84.

Del Potro was playing his first tournament since breaking a kneecap at the Shanghai Masters in October.

He defended two break points before winning the second set, but McDonald then converted his third match point in a third-set tie-break to seal victory.

McDonald, 23, next faces Moldova's Radu Albot, who came from a set and a break down to beat American fourth seed Steve Johnson 1-6 6-3 7-6 (7-5).

In the other last-four tie in Florida, Britain's Dan Evans will play his first ATP Tour semi-final for over two years against John Isner of the United States.

Del Potro appeared to be affected by a heavily strapped knee and he pulled out of next week's tournament in Acapulco, Mexico - where he had accepted a wildcard to defend his title - after the defeat by McDonald.

"It's hard to win matches when you can't move at 100%," he said.

The world number four is due to play at March's Indian Wells Masters, which he also won last year.

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