Mello upsets 5th-seeded Isner at Serbia Open

Updated: 27 April 2011 11:01 IST

Ricardo Mello of Brazil upset last year's finalist John Isner of the United States 6-4, 7-6 (4) on Tuesday in the first round of the Serbia Open, while former fifth-ranked Fernando Gonzalez of Chile made a winning return from an eight-month injury layoff.

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