Spain's Rafael Nadal (R) chats with his uncle and coach Toni Nadal at the start of Davis Cup World Group playoff tennis tie between Spain's Fernando Verdasco and Ukraine's Alexandr Dolgopolov in Madrid September 13, 2013. REUTERS/Sergio Perez
MADRID (Reuters) - Rafa Nadal's uncle and coach Toni has reacted to the world number one's recent problems with time penalties by suggesting some chair umpires do not understand tennis because they have not played professionally.
Rafa Nadal, who will play Swiss Stanislas Wawrinka in Sunday's Australian Open final, was incensed after being called for multiple time violations by Greek umpire Evanthia Asderaki in Monday's fourth-round victory against Kei Nishikori.
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