Rio de Janeiro, Feb 24: Argenti's Diego Schwartzman edged Gael Monfils 6-3, 6-4 to enter the semi-fils 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.