2010 World Junior Championships in Athletics – Men's 100 metres

The men's 100 metres at the 2010 World Junior Championships in Athletics was held at the Moncton 2010 Stadium on 20 & 21 July.

Records
Prior to the competition, the existing world junior and championship records were as follows.

No new records were established during the competition.

Final
21 July Wind: -0.7 m/s

Key: PB = Personal best, SB = Seasonal best

Semifinals
21 July

Qual. rule: first 2 of each heat (Q) plus the 2 fastest times (q) qualified.

Semifinal 1
Wind: +2.6 m/s

Semifinal 2
Wind: +2.2 m/s

Semifinal 3
Wind: +0.9 m/s

Heats
20 July

Heat 1
Wind: +2.2 m/s

Heat 2
Wind: +1.3 m/s

Heat 3
Wind: +0.8 m/s

Heat 4
Wind: +0.4 m/s

Heat 5
Wind: +1.0 m/s

Heat 6
Wind: +0.2 m/s

Heat 7
Wind: +1.3 m/s

Heat 8
Wind: +1.3 m/s

Participation
According to an unofficial count, 57 athletes from 46 countries participated in the event. • 🇦🇮 anguilla (1)

• 🇦🇲 armenia (1)

• 🇦🇺 australia (1)

• undefined (2)

• 🇧🇪 belgium (1)

• 🇧🇷 brazil (1)

• 🇨🇲 cameroon (1)

• 🇨🇦 canada (1)

• undefined (1)

• 🇨🇿 czech republic (1)

• 🇫🇷 france (2)

• 🇬🇦 gabon (1)

• 🇩🇪 germany (2)

• 🇬🇮 gibraltar (1)

• undefined (1)

• 🇬🇾 guyana (1)

• 🇭🇰 hong kong (1)

• 🇭🇺 hungary (1)

• undefined (1)

• undefined (1)

• 🇮🇹 italy (1)

• 🇯🇲 jamaica (2)

• 🇯🇵 japan (2)

• 🇰🇮 kiribati (1)

• 🇱🇦 lao people's democratic republic (1)

• undefined (1)

• 🇲🇴 macao (1)

• 🇲🇭 marshall islands (1)

• 🇫🇲 micronesia (1)

• 🇲🇸 montserrat (1)

• undefined (1)

• 🇵🇼 palau (1)

• 🇵🇱 poland (2)

• undefined (1)

• undefined (1)

• 🇸🇲 san marino (1)

• undefined (1)

• undefined (2)

• 🇰🇷 south korea (1)

• 🇪🇸 spain (2)

• 🇹🇭 thailand (2)

• undefined (2)

• 🇹🇷 turkey (1)

• 🇹🇨 turks and caicos islands (1)

• undefined (1)

• 🇺🇸 united states (2)