Usain Bolt held the world record in the 100 meter dash.
Usain Bolt . He is the first person to hold both the 100 metres and 200 metres world records since fully automatic time became mandatory . He also holds the world record as a part of the 4 × 100 metres relay . Bolt improved upon his first 100 m world record of 9.69 with 9.58 seconds in 2009 -- the biggest improvement since the start of electronic timing . He has helped Jamaica to three 4 × 100 metres relay world records , with the current record being 36.84 seconds set in 2012 .