Ever since Usain Bolt nonchalantly galloped to 100m, 200m and 4x100m gold at Beijing 2008, he has been untouchable -- barring injury -- at the top of world sprinting.
The one blot on his near-perfect record came after a false start at the 2011 World Athletics Championships in Daegu.
As the 30-year-old heads towards the exit -- Bolt says he will retire
in 2017 -- athletics' lingering concern now lies in finding a new hero -- somebody to fill the Jamaican's size 13 spikes.
"Judging from Rio, I think Andre De Grasse," Linford Christie, who won gold at the 1992 Barcelona Games, told CNN.
"He was third in the 100m and second in the 200m — he's my tip. He's young, and if he keeps doing what he's doing then hopefully he'll improve."
The 21-year-old Canadian set personal bests in both sprints (9.91 seconds in the 100m and 19.80 seconds in the 200m) in Rio and famously joked with Bolt when they crossed the line together in the 200m semifinals.
"I got to race against him on the biggest world stage."
While crowds may lament Bolt's impending departure, Christie believes it will give sprinting a new lease of life.
"I think some of the sprinters are rubbing their hands together," the 56-year-old said.
"Sometimes when you get a guy like Usain Bolt, or anyone that's been dominant as much as he has, then it does stagnate the guys behind because they start thinking 'what can we do to beat him?' And when you can't beat him, then they settle for second place."