Both winners took advantage of tired opponents. Johansson and del Potro both played quarterfinal matches earlier in the day because of rain Friday.
Djokovic will be going for his third career title Sunday. Guccione has never won a championship and came into the tournament ranked 153rd in the world.
The winner of Sunday's Australian Open tune-up will collect $64,800.
|Additional Sports News Stories|
ANGKOR WAT, Cambodia, June 18 (UPI) --Aircraft equipped with lasers have revealed a lost city near Angkor Wat in Cambodia, hidden for centuries under a dense forest cover, researchers say.