The 17-time Grand Slam winner, who cut short his 2018 season to have surgery on a foot injury, cruised into round two of the year's opening major 6-4, 6-3, 7-5 against Australian wildcard James Duckworth.
"The energy I feel in this place is fantastic," he added. The Spanish second seed is bidding to become the first man in the Open era, and only third in history along with Roy Emerson and Rod Laver, to win each Grand Slam on two or more occasions.
Fifth seed Kevin Anderson also progressed against Adrian Mannarino, with last year's Wimbledon finalist a 6-3, 5-7, 6-2, 6-1 winner. NextGen Finals champion Stefanos Tsitsipas also went through in four sets.
"We now have 2019 and I try to continue to play how I did last year," said the three-time Grand Slam winner.
Sharapova, a winner at Melbourne Park in 2008, signalled her intent with a rare 6-0, 6-0 double bagel demolition of Britain's Harriet Dart, who ended the match in tears.
Playing in her 15th Australian Open, the three-time finalist said she was pleased to go through so easily as she battles back from injuries.
"It was a good test for my leg, for my shoulder," she said.
"I'm still working through some painful days. But, you know, I felt like I did all the right things today in order to get through that match."
Fifth seeded Sloane Stephens, the 2017 US Open champion who struggled in her warm-up tournaments in Brisbane and Sydney, got back to business with an easy two-set win against fellow American Taylor Townsend.
Eleventh seed Aryna Sabalenka, widely tipped as a potential future champion, also safely negotiated round one on a hot day.
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Britain's Katie Boulter, meanwhile, created a slice of history by becoming the first woman to win in a third set tiebreak -- a new rule introduced to the Open this year.
Instead of playing to the death, third or fifth sets now go to a tie-break when the score reaches 6-6 and it becomes the first to 10.
It seemed Boulter wasn't told, fist-pumping and walking to the net at 7/4 before being reminded of the new rule. She went on to beat Russia's Ekaterina Makarova 6-0, 4-6, 7-6 (10/6).
Swiss maestro Federer, seeded three, has won the last two Australian Opens and is gunning for a record seventh crown and 21st Grand Slam title.
He would like to finish at Wimbledon, but admitted the Australian Open could be his last tournament.
Spain's 22nd seed Roberto Bautista Agut is the man who could draw the curtain on Murray's time Down Under, where he has been a five-time finalist.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)