Andy Roddick romped into the Australian Open semi-finals with a convincing 6-2 6-2 6-2 victory over former flatmate and fellow American Mardy Fish on Tuesday.
Fish upset fourth seed Ivan Ljubicic in the first round but failed to deal with the power of the sixth seed, who secured his third appearance in the last four at the Melbourne grand slam in one hour and 27 minutes at the Rod Laver Arena.
Roddick took the first set with two breaks and despite dropping serve at the beginning of the second doubled his lead with three breaks of his own.
Two further service breaks in the third set saw Roddick home to set-up a semi-final meeting with number one seed Roger Federer or Spain's Tommy Robredo in the last four.
Roddick powered past his compatriot with a 92% first-serve success rate, while Fish struggled throughout and conceded 26 unforced errors compared to just two from the world number seven.
