Watch Santos (lane 4) explode out of the blocks in the 50m Butterfly final. He's well clear of the rest of the field by 10m.
Is Santos swimming's fastest starter?
There are a number of other challengers for the title. Ryan Lochte, Cesar Cielo, Kenneth To, Roland Schoeman, Steffen Diebler and Florent Manaudou.
Here is Manaudou's start from the 50m free final.
Ryan Lochte from the 100 IM semi-final
...and Cesar Cielo from the 50m free in Dubai 2010
Unfortunately we don't have a definitive answer, but there is little doubt that Nicholas Santos is in rare company when it comes to getting off the blocks.