It's his 6th Paralympic gold medal.
Jason Smyth won his sixth Paralympic gold medal in Tokyo.
It brings Team Ireland's medal haul at this year's games to two gold medals and one silver.
The Derry sprinter fought off competition from Algeria to cross the line first, and win the T13 100 metres for the fourth consecutive games.
Jason Smyth who has a visual impairment, says he didn't know if he won: