Golf great Jack Nicklaus won 18 majors, tennis legends Chris Evert and Martina Navratilova each captured 18 Grand Slam singles crowns and swimming superstar Michael Phelps amassed 18 Olympic gold medals.
But no one has ever played 18 consecutive Australian Open tennis championships before.
Not until Lleyton Hewitt steps on to Rod Laver Arena today to face Italian Andreas Seppi in the baseline warrior's seemingly endless pursuit of an elusive home major.
Runner-up to Marat Safin in 2005, Hewitt has returned to Melbourne Park year after year since becoming the youngest qualifier in history way back in 1997.
A month shy of his 33rd birthday, Hewitt ranks among the greatest survivors in Grand Slam history.