Top-seeded defending champion Dominic Thiem of Austria tumbled out of the Rio Open on Friday, falling 6-4, 6-0 to Spain's Fernando Verdasco in the quarterfinals of the clay-court event.
Thiem won the Argentina Open on Sunday for his ninth career title.
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Verdasco will play fifth-seeded Fabio Fognini of Italy, a 6-7 (3), 6-3, 6-1 winner over Alijaz Bedene of Slovenia in the late match. Bedene lost to Thiem in the Argentina Open final.
In the other semifinal at Jockey Club Brasileiro, sixth-seeded Diego Schwartzman of Argentina will face Chile's Nicolas Jarry. Schwartzman beat France's Gael Monfils 6-3, 6-4, and Jarry topped Uruguay's Pablo Cuevas 7-5, 6-3.
