Jason Smyth set a new Championship record as he stormed to gold in the T13 100m final at the World Para-Athletics Championships in Dubai.
The Ireland runner won his 20th gold medal of a glittering career in a time of 10.54, which was just outside his season's best.
Australia's Chad Perris won silver and Namibia's Johannes Nambala took bronze.
Smyth's gold is Ireland's second medal in Dubai after Niamh McCarthy won bronze in Tuesday's F41 discus final.
County Londonderry athlete Smyth has remained unbeaten in a 14-year Paralympic career and has won nine world titles in that time.
The 32-year-old dominated the final with nearest challenger Perris running in 10.86 while Nambala clocked 10.98.
"Things have obviously been going very well this year," said Smyth.
"It's such a strange time of the year to try and hit fast times, but to come here and put in one of my quickest times of the season is testament to a lot of people around me, who support me."
The victory takes Smyth's gold medal tally to 20, which includes five Paralympic golds, nine World Para-Athletics Championships and six European titles.
Ireland's Jordan Lee impressed on his World Championship debut but just missed out on a medal with a result of 1.91m in the T47 High Jump final.