This year 's Diamond League opens in Doha .
Dasaolu will be up against the controversial Justin Gatlin who continues to improve - running six of the seven fastest times in the 100m last year , including a PB of 9.77 seconds .
This year 's Diamond League opens in Doha , and Dasaolu will be up against the controversial Justin Gatlin who continues to improve - running six of the seven fastest times in the 100m last year , including a PB of 9.77 seconds .