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Rio de Janeiro - Former world No 1 Rafael Nadal reached the Rio Open semi-finals without even hitting a ball on Friday as Aleksandr Dolgopolov withdrew injured from their last-eight tie.
Nadal is playing at the low-key clay court event in a bid to find his form ahead of a tilt at an unprecedented 10th French Open crown in June.
The 29-year-old Spaniard has dropped to No 5 in the world after an injury-hit 2015 and suffered a shock semi-final defeat to Austria's Dominic Thiem in the semi-finals last week at Buenos Aires, where he was defending champion.
Ukraine's Dolgopolov was forced to withdraw due to a right shoulder injury.
Nadal will next play in Saturday's semi-finals against Uruguay's Pablo Cuevas, who defeated Argentina's Federico Delbonis 6-4, 7-6 (7/4).
