Even the greatest tennis player of all time needs proper identification. A security monitor at the Australian Open made one of the World's most famous athletes show his ID badge. The patient tennis player followed proper protocol, but the fact he had to gives tennis fans a laugh.

"I don't care who you are, mate - you're not coming in"

Even GOATs need their accreditation, right @rogerfederer? pic.twitter.com/qk5mecaUVr

— Eurosport UK (@Eurosport_UK) January 19, 2019