Top seed Dominic Thiem was knocked out of the Rio Open in the first round on Tuesday, going down 6-3, 6-3 to Laslo Derje, a result that gave the unheralded Serbian his first victory over a top 10 player in his career.

Top seed Dominic Thiem knocked out of Rio Open in first round

Argentina's Diego Schwartzman won the biggest title after defeating Spaniard Fernando Verdasco 6-2, 6-3 in the final of the clay court Rio de Janeiro Open

Tennis: Diego Schwartzman wins Rio Open

Cilic has referred to Roger Federer's glory of becoming world number one as an amazing achievement

Ultimate goal is to follow Federer's footsteps: Marin Cilic

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Top seed Dominic Thiem knocked out of Rio Open in first round

Tennis: Diego Schwartzman wins Rio Open

Ultimate goal is to follow Federer's footsteps: Marin Cilic