Nadal a question mark after a cramp-ridden semifinal loss on Saturday at the Rio Open...Not a lot of early challenges besides (7) Andujar opening against Almagro...Wildcards went to Argentines Guido Andreozzi, Renzo Olivo and Horacio Zeballos...David Ferrer beat Fognini in last year's final...Nadal is making his first appearance in Buenos Aires in 10 years...Ferrer passes on the opportunity to win a fourth consecutive Buenos Aires title in a row...Returning former champs in the field are Almagro (2011), Robredo (2009), and Juan Monaco (2007).
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