Rafael Nadal reached the second round of the Australian Open despite a spirited challenge from Grand Slam debutant Viktor Troicki of Serbia.
Nadal opened his Australian Open account with a straight-sets win
The world number two was taken to a tiebreak in the first set and was a break down in the second before he eventually came through 7-6 7-5 6-1.
Nadal joins Andy Roddick and Nikolay Davydenko in the next round.
Sixth seed Roddick beat Czech Lukas Dlouhy 6-3 6-4 7-5, while Davydenko saw off Michael Llodra 7-5 7-5 6-3.
Other seeds that progressed on day one included Richard Gasquet, Tommy Robredo and Mikhail Youzhny.
Nadal was rarely at his best against Troicki, the a 21-year-old making his Grand Slam debut under the lights on Rod Laver Arena.
"I had to work hard and he played aggressive," said the Spaniard, who is yet to go beyond the quarter-finals in Melbourne.
"I was a little bit nervous at the beginning because it was my first big match of the season.
"But I played better on the important points and I changed my playing rhythm and serve in the third set."
Roddick, fresh from winning the Kooyong Classic for the third time, was happy to successfully negotiate his first-round clash - in which his opponent delivered 12 double-faults in the first two sets.
"I think those are the type of matches where if you're not match tough it can get a little tricky," he said.
"I just tried to stay the course and get through his kind of peaks and valleys."
French number eight seed Gasquet saw off the challenge of Australian wildcard Nick Lindhahl in four sets, but Robredo needed five sets to beat his German opponent Mischa Zverev.
The Spaniard, seeded 11th, fought back from losing the opening two sets to win 4-6 2-6 7-6 6-4 7-5.
Davydenko's Russian compatriot and 14th seed Youzhny had no trouble in seeing off Mathieu Montcourt winning 6-0 6-2 7-6.
But Carlos Moya, runner-up in 1997 and seeded 16th for this year's tournament, was sent crashing by the unseeded Austrian Stefan Koubek in four sets.