Result: Juan Martin del Potro defeated by Horacio Zeballos at Miami Masters

Horacio Zeballos - who replaced Roger Federer - progresses through to the third round of the Miami Masters after beating Juan Martin del Potro in straight sets.

Juan Martin del Potro has been defeated by Horacio Zeballos in the second round of the Miami Masters after his Argentine compatriot had earlier replaced Roger Federer.

The world number three withdrew from the event with a stomach virus, gifting Zeballos a lucky-loser spot and a chance to play Del Potro on the show court in Florida.

Horacio Zeballos and Juan Martin del Potro in their second-round match during the Miami Open on March 25, 2016© Getty Images

Del Potro, a former US Open champion, started as favourite but he failed to create a single break point as Zeballos ran out a 6-4 6-4 winner.

Despite finishing the match, the 27-year-old will likely be more concerned with his troublesome wrist after receiving treatment during the contest.

Roger Federer in action on day one of the Australian Open on January 18, 2016
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