MELBOURNE, Australia (AP) — Maybe Roger Federer isn't as famous as we thought.
Turns out that even he must carry his tournament ID to get where he's try to go at the Australian Open.
Rules are rules, after all.
So what if Federer is a six-time champion at Melbourne Park ... the owner of 20 Grand Slam titles in all ... a man who's spent more weeks ranked No. 1 than any other ... and one of the most recognizable athletes on the planet?
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 on Saturday, drawing a mix of amazement and amusement.
Related: Roger Federer through the years
Roger Federer through the years
Roger Federer through the years
MARSEILLE, FRANCE - FEBRUARY 2: Roger Federer of Switzerland returns to Carlos Moya of Spain to qualify for the second round of the Open 13 Tennis tournament on February 2, 1999 in Marseille, France. Federer won 7-6(1), 3-6, 6-3. (Photo by Georges Gobet/AFP/Getty Images)
22 Feb 2000: Roger Federer of Switzerland plays a backhand during the AXA Cup 2000 at the London Arena in Docklands, London. (Photo by Clive Brunskill /Allsport)
(GERMANY OUT) Australian Open 2001 in Melbourne (Photo by Claus Bergmann/ullstein bild via Getty Images)
Roger Federer of Switzerland holds up the Wimbledon trophy after defeating Mark Philippoussis of Australia in their Men's Final match at the Wimbledon Tennis Championships 06 July, 2003 in Wimbledon, south London. Federer won 7-6, 6-2, 7-6. (Photo by Thomas Coex/AFP/Getty Images)
SHANGHAI, CHINA: Swiss world number one tennis player Roger Federer jubilates after beating Ivan Ljubicic of Croatia in their match at the Tennis Masters Cup in Shanghai, 15 November 2005. Federer won the match 6-3, 2-6, 7-6 (7/4). (Photo by Mark Ralston/AFP/Getty Images)
CUDDALORE, INDIA: Swiss tennis player and UNICEF Goodwill Ambassador Roger Federer interacts with children at a shelter for people affected by the December 2004 tsunami, in Cuddalore, in India's southeastern state of Tamil Nadu, 22 December 2006. Over 200,000 people lost their lives in the 2004 tsunami which hit the Indian Ocean coastline, 8,000 of them in Tamil Nadu. The UNICEF has been working on relief and recovery in 8 countries since the tsunami struck, building shelters but also steering programmes in health and nutrition, drinking water, education and child protection. (Photo by Strdel/AFP/Getty Images)
Roger Federer of Switzerland reacts during his men's final match against Andy Murray of Great Britain at the US Open tennis tournament on September 8, 2008 at the USTA National Tennis Center in New York City. Federer won the first two sets of the US Open final 6-2 and 7-5 over Murray as the Swiss second seed bids for his 13th Grand Slam title and fifth straight US Open crown. (Photo by Timothy A. Clary/AFP/Getty Images)
MELBOURNE, AUSTRALIA - JANUARY 31: Roger Federer of Switzerland poses with the Norman Brookes Challenge Cup in the players locker room after winning the men's final match against Andy Murray of Great Britain during day fourteen of the 2010 Australian Open at Melbourne Park on January 31, 2010 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)
LONDON, ENGLAND - JULY 08: Roger Federer of Switzerland celebrates after winning his Gentlemen's Singles final match against Andy Murray of Great Britain on day thirteen of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 8, 2012 in London, England. (Photo by Clive Brunskill/Getty Images)
NEW YORK, NY - AUGUST 23: Professional tennis player Roger Federer attends the ATP Heritage Celebration at The Waldorf Astoria on August 23, 2013 in New York City. (Photo by D Dipasupil/Getty Images)
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In the clip, the guard is seen indicating to Federer that he was missing his Australian Open accreditation pass. Players, coaches, officials, members of the media and others are given lanyards with badges that have a name, a photo, tournament role and a bar code that can be scanned at security checkpoints.
Federer didn't argue. He stood patiently, waiting until he was joined by members of his entourage. That's when he was allowed to proceed and go through the door.
Saturday was a practice day for Federer at Melbourne Park.
He is scheduled to face Stefanos Tsitsipas in the fourth round on Sunday.