The world number three defeated his Argentinian opponent 6-1 6-4 in an hour and 26 minutes.
It was the ninth victory for the Swiss in 11 meetings.
Federer made two breaks in the opening set as he found a way through Del Potro’s impressive serve.
He then took five games from seven to come from 2-1 down in the second set.
Del Potro had forced five break points that Federer saved before converting one of his own in the fifth game to secure the win.
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