/https%3A%2F%2Fsportsmole-media-prod.s3.gra.io.cloud.ovh.net%2F12%2F45%2Fjuanmartindelpotro_20121108.jpg "Del Potro crashes out in Miami")
Juan Martin del Potro has crashed out in the second round of the Miami Masters with a straight-sets defeat to world number 89 Tobias Kamke.
The Argentine fifth seed looked out of sorts on court as he was beaten 7-6 6-1 by his German opponent.
Del Potro came into the tournament on the back of losing Sunday's final at Indian Wells to Rafael Nadal.
Kamke will now face Austrian Jurgen Melzer for a place in the fourth round.
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