Stefanos Tsitsipas, 20, idolises Roger Federer, who at 37, was the oldest man left in the field and was bidding to become the oldest man to reach the quarterfinals in Australia since 1977.
14th seed Stefanos Tsitsipas defeated 3rd seed Roger Federer 6-7 7-6 7-5 7-5 in fourth round to knock the Swiss out of Australian Open.
A video showing Federer stopped by a security guard in a hallway outside a locker room at the Grand Slam tournament made the rounds on Twitter.
Kohli was at Melbourne Park on Saturday, a day after leading India to another series victory against Australia.
Roger Federer marked his 100th match on Rod Laver Arena by defeating American Taylor Fritz 6-2, 7-5, 6-2 in the third round.
Roger Federer also maintained his 100 percent record of reaching the third round at the Australian Open - 20 times in a row.
Roger Federer defeated Denis Istomin 6-3, 6-4, 6-4 while Rafael Nadal got the better of James Duckworth 6-4, 6-3, 7-5 in the first round of Australian Open.
Djokovic has six Australian Open titles, a record he shared with two-time defending champion Roger Federer and Roy Emerson.
The Swiss said he was aware of the potential of Istomin, who upset defending champion Novak Djokovic in Melbourne in 2017.
Aiming for a third consecutive Australian championship, a 21st Grand Slam crown and a 100th career singles title, Federer will open against Denis Istomin.
Serena Williams, who won the Australian Open in 2017 while pregnant with daughter Alexis Olympia, returns as the 16th-seeded player after missing last year's tournament.
Switzerland took its fourth Hopman Cup title overall when Roger Federer and Belinda Bencic beat Alexander Zverev and Angelique Kerber 4-0, 1-4, 4-3 (4) in the Fast4 format.
The 37-year-old Federer's precision went up against Tsitsipas' power in the first set of the men's singles match, and not much separated the two. Eight games were held at love.
Federer and playing partner Belinda Bencic overcame Williams and Frances Tiafoe in the Fast4 format in front of a 14,000 capacity crowd.
In the opening edition of the tournament in 2017, they played as doubles partners for the very first time.
Zverev denied Roger Federer a shot at a 100th career title by beating the Swiss great 7-5, 7-6 (5) at the ATP Finals on Saturday.
Zverev is the youngest player at 21 to reach the semifinals since 2009 and the first from Germany since 2003.
Alexander Zverev defeated John Isner 7-6 6-3 to reach the semi-finals of the ATP Finals for the first time in his career.
Roger Federer defeated Kevin Anderson 6-4, 6-3 to move into the semi-finals of the ATP Finals for a record-extending 15th time.
Roger Federer defeated Dominic Thiem 6-2 6-3 in his second game at this year's ATP Finals in London on Tuesday.
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