Rieti - American sprinter Justin Gatlin has finished the season undefeated by winning the 100 meters in 9.83 seconds at the IAAF world challenge meeting Sunday.
Gatlin won all 18 races he entered this year.
"My season ends now.
"I need to rest," Gatlin said.
"The crowd gave me a lot of energy."
Two finals were held and former world record holder Asafa Powell won the first in 9.90.
Powell, who is returning from a doping ban, set a then world record of 9.74 seconds in Rieti in 2007.
In Gatlin's final, Jamaica's Nesta Carter was the runner-up in 10.07 and Christophe Lemaitre of France took third in 10.15.
In the high jump, Bohdan Bondarenko edged fellow Ukrainian Andriy Protsenko, 2.36 meters to 2.25, for the 10th consecutive time.