The 17-time Grand Slam champion maintained his unbeaten start to the year, having won the inaugural ATP Cup with Serbia and clinching a record-extending eighth Australian Open title.
Top-ranked Novak Djokovic defeated Philipp Kohlschreiber 6-3, 6-1 while Stefanos Tsitsipas got the better of Nikoloz Basilashvili 6-1, 6-0.
The second-seeded Greek had six aces and broke his strong-serving Kazakh opponent's serve three times, dropping his own once. Playing only his third semifinal at this level, Bublik competed well and hit eight aces.
The 2016 Wimbledon finalist had five match points in the third-set tiebreaker and converted his second with a booming forehand winner for a 7-5, 6-4, 7-6 (2) victory on Margaret Court Arena.
Roger Federer defeated Steve Johnson 6-3, 6-2, 6-2 while defending champion Novak Djokovic went past Jan-Lennard Struff 7-6, 6-2, 2-6, 6-1 in the first round of Australian Open.
The match between two players, who will be among the shortlist of favourites at next month's Australian Open, fully lived up to the expectations.
Stefanos Tsitsipas lifted the ATP Finals title for the first time with a win over Dominic Thiem.
Stefanos Tsitsipas vs Dominic Thiem Live Streaming ATP Tour Finals: Here are the details of live tennis match streaming online on SonyLIV
Stefanos Tsitsipas defeated Roger Federer, while Dominic Thiem cruised to win over defending champion Alexander Zverev to reach the final.
Tsitsipas saved 11 of 12 break points and took advantage of an error-filled performance from Federer — who continually put his opponent under pressure only to come up short when it mattered.
The top-ranked Spaniard still needs help from Daniil Medvedev to avoid an early exit.
Stefanos Tsitsipas began his campaign in style as he beat Daniil Medvedev in straight sets.
Djokovic, last year's runner-up, is bidding for the year-ending No. 1 ranking.
Roger Federer eased past Stefanos Tsitsipas 6-4, 6-4 in the Swiss Indoors semifinals.
The defending champion from Serbia, a four-time winner of the Shanghai Masters who had reached the semifinals in all eight of his appearances at the tournament, lost to sixth-seeded Stefanos Tsitsipas 3-6, 7-5, 6-3 on Friday in the quarterfinals.
The umpire told Stefanos Tsitsipas it was time to play, but Tsitsipas was still reaching into his bag for a new headband and screamed at Damien Dumusois that he still needed time to change.
Stan Wawrinka outlasted Greece's Stefanos Tsitsipas 7-6 (8-6), 5-7, 6-4, 3-6, 8-6 in a marathon French Open fourth-round clash that lasted five hours and nine minutes.
Rafael Nadal took his revenge on Tsitsipas he beat the Greek 6-3 6-4 to enter the final of the Italian Open.
Nadal's slump on clay continued on Saturday at the Madrid Open with a third consecutive semifinal elimination, adding to his worst start to the clay-court swing since 2015.
Roger Federer defeated Stefanos Tsitsipas 6-4, 6-4 in the final of the Dubai Championships on Saturday.
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