's quest for a seventh Australian Open
title will continue this year after he won his first-round encounter.
The Swiss legend proved too good for Denis Istomin as he won in straight sets 6-3, 6-4, 6-4.
The world No 3 is among the favourites to win the first Grand Slam of 2019 and will face Britain's Dan Evans in the next round.
Playing before a capacity crowd of more than 15,000 at Rod Laver Arena, Federer broke Istomin's serve at 2-2 in the third set on the way to his seventh win in a row without a loss against the Uzbekistan player.
Federer's seventh Australian Open title would be the most by any player. Novak Djokovic, who plays his first-round match on Tuesday, and Roy Emerson, also have six wins each at the Australian Open, although Emerson's wins were before the start of the Open era in 1968.
A win in Melbourne would also be Federer's 100th tour-level title, the second man after Jimmy Connors to win 100 titles. Connors had 109.