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Argentina's Diego Schwartzman edged Gael Monfils 6-3, 6-4 to enter the semi-finals of the Rio Open tennis championships. Schwartzman on Friday used his strong return game and speed to put constant pressure on Monfils' service games, breaking the Frenchman twice in each set to claim victory in one hour and 23 minutes, reports Efe. In the first set, Monfils committed four doubles faults, won just 50 per cent of his overall service points and only 25 per cent of his second-serve points.