How many times did Bolt break solo races world records?
Usain Bolt first broke the 100-metre record in 2008 by clocking 9.72 seconds, overtaking Asafa Powell's 9.74 seconds. Bolt broke his record over two months later, finishing 100-metre race in 9.69 seconds, before clocking the 9.58-second mark in 2009. Bolt broke Michael Johnson's 200-metre world record in 2008, clocking 19.3 seconds before improving upon it with 19.19 seconds in 2009.