2009 World Youth Championships in Athletics – Boys' 100 metres
The Boys' 100 metres at the 2009 World Youth Championships in Athletics was held at the Brixen-Bressanone Sport Arena on 8 and 9 July. The event was won by Prezel Hardy of the United States.Medalists
Records
Prior to the competition, the following records were as follows.
No new records were set during the competition.Heats
Qualification rule: first 2 of each heat plus the 4 fastest times qualified.Semifinals
Qualification rule: first 4 of each heat qualified.Heat 1
Key: PB = Personal best, SB = Seasonal best
Wind: 1.1 m/sHeat 2
Key: PB = Personal best, SB = Seasonal best
Wind: 1.3 m/sFinal
Rank | Lane | Name | Nationality | Time | Notes |
| 6 | Prezel Hardy | | 10.57 | |
| 5 | Aaron Brown | | 10.74 | |
| 7 | Giovanni Galbieri | | 10.79 | |
| 4 | Ryota Yamagata | | 10.80 | |
| 8 | Huang Xiang | | 10.83 | |
| 1 | Takumi Kuki | | 10.88 | |
| 3 | Jimmy Vicaut | | 10.89 | |
| 2 | Moriba Morain | | 10.94 | |
Key: PB = Personal best, SB = Seasonal best
Wind: −1.2 m/s