Men's 100m Butterfly - Final - Swimming | London 2012 Highlights
The men's 100m butterfly event at the 2012 Summer Olympics was held in the London Aquatics Centre. Phelps won the olympic gold USA.
Presented by
Men's 100m Butterfly - Final - Swimming | London 2012 Highlights
The men's 100m butterfly event at the 2012 Summer Olympics was held in the London Aquatics Centre. Phelps won the olympic gold USA.
