Twelve Jamaicans will be in action on Friday in three relay events at the London 2012 Olympics. 

Afternoon session 

Women’s 4x400 Metres Relay Heats 1:10PM 

SQUAD: 

Novlene Williams-Mills 
Rosemarie Whyte 
Christine Day 
Shericka Williams 
Shereefa Lloyd 
Dominique Blake 

Men’s 4x100 Metres Relay Heats 1:45PM 

SQUAD: 

Yohan Blake 
Usain Bolt 
Michael Frater 
Kemar Bailey-Cole 
Nesta Carter 

Women’s 4x100 Metres Relay Final 2:40 PM 

SQUAD: 

Shelly-Ann Fraser-Pryce 
Veronica Campbell-Brown 
Kerron Stewart 
Sherone Simpson 
Schillonie Calvert 
Samantha Henry-Robinson