Wearing a black T-shirt and tan trousers, the man calmly walked on during the second set before raising his right arm, fist clenched, and shouting "Hell Seger!", a Swedish translation of the Nazi slogan "Sieg Heil".
The umpire stopped play and the man was led away by security guards. Play resumed after a brief interruption.
The disruption occurred with Ferrer leading his fellow Spaniard by one set to love. Verdasco bounced back to win the second set but Ferrer took the decider for a 6-1 6-7(3) 6-4 victory and will meet Alexandr Dolgopolov in Sunday's final.
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(Reporting by Philip O'Connor; Editing by Clare Fallon)
