Youzhny made an edgy start, losing his first service game, and that proved decisive as Ivanisevic served out the set.
He enjoyed a good start Sunday and broke Nadal's first service game with a forehand winner before holding serve to love.
Fourth seed Williams breezed through the opening set in just 37 minutes after losing her first service game, and showed no signs of rustiness after her lay-off.
Djokovic enjoys an impressive record over Troicki, losing just once in their last 13 encounters, and broke his opponent's first service game to set the tone for the match.
Rusedski won his service game but Henman took the first of his three match points with a service winner to secure his place in the second round at Dubai for the first time in three years.
Djokovic, the two-time defending champion in Melbourne, hadn't lost a set, or for that matter, a service game in his first three matches.
Chela nicks the first two points of Murray's service game but Murray hits back with an ace.
But his first glaring error came in his second service game, when a low volley crashed into the net.
Henman started dreadfully by losing his second service game but despite losing the first set, the fact that he did claim two break points did give the crowd some hope.
Roddick came from behind to beat Stepanek's fellow Czech Tomas Berdych in the semifinals on Saturday, with the American winning 1-6 6-3 6-4 despite being broken for the first time in the tournament in his opening service game.
Murray, whose service game was impeccable, held to clinch the first set and both players held serve in the second for a nail-biting tie-break.
The 19-year-old squandered a match point and was then broken for the first time in the match but made no mistake in his next service game.
Kuznetsova then had three game points on her service, but Henin-Hardenne recovered to win the first of six straight games.
Tsonga had the look of a man who knew the game was up by the time the first set had disappeared and his third double-fault of the day contributed to another dropped service game at the start of the second set, and it was the same story as he slipped 5-2 down.
Murray seemed rejuvenated from his three-week break as his service game was almost flawless, with the British number one dropping just one point in the first set.
After claiming the first set, where both men had to come back from 0-40 down on the service in a one game, Ljubicic was rock solid in the second.
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