Usain Bolt ducked under 10 seconds for the first time this year to win his last ever race outside of a major championships.
The Jamaican world and Olympic 100 metres and 200m champion recovered from a slow start to roar clear of the 100m field at the Diamond League meeting in Monaco.
He clocked 9.95 seconds to beat Isiah Young of America by three hundredths of a second, with South African Akani Simbine third and Great Britain's Chijindu Ujah fourth in 10.02.
Bolt, who this week revealed he has been having treatment for a back problem, defends a global sprint title for the last time at the World Championships in London next month.
"It was good, I'm going into right direction, still a lot of work to do," said Bolt.
"I'm always here for the fans, and of course I will miss the vibe around the track. Mixed emotions always -- happy for my career, sad that it is ending. Sub-10 is always good. It was an exciting race, lots of energy."
Olympic and world champion Wayde van Niekerk won a titanic battle against Botswana's Isaac Makwala to take the 400 metres.
The South African, also the world record holder in the event, made a lightning start, then Makwala recovered to lead coming off the final bend before Van Niekerk powered down the final straight to win in 43.73 seconds.
Makwala's time of 43.84 was a personal best.
Van Niekerk's fellow South African, Caster Semenya, won a dramatic women's 800 metres in a season's best and meeting record time of 1:55.27.
