When Adam Gemili clocked 9.97 in the 100m in Birmingham last weekend, there was some confusion over whether or not he became the 100th member of the sub-10-second club.

Some stats sites listed him as the 102nd member, others the 100th, the 101st, the 103rd. You get the picture.

It’s exactly the kind of minutiae that keeps me awake at night, so I had to sort out a chronological list of all sub-10-second performers (based on their first ever such performance) to determine once and for all who is in the club and who is out.

It didn’t take long to see the source of the confusion; there were three debatable performances, none of which belong on the list.

Some sites credit Ben Johnson with a 9.95 clocking from the 1986 Goodwill Games (while still discrediting all of his other times achieved while on drugs), but that run came subsequent to his disqualification period and so shouldn’t be officially recognised.

Mark Lewis-Francis famously went sub-10 in 2001, but his 9.97 came in a race with a faulty wind gauge and so cannot be included in a list alongside other wind-legal performances.

Phil DeRosier clocked 9.97 in 2012, but with his previous season’s best being 10.30, it is generally regarded as a doubtful performance.

What this means is that Gemili DID indeed become the official 100th member of the sub-10-second club last weekend in Birmingham.

So here are all 100 members, in chronological order of their first sub-10 performance. I’ll try to keep this list updated as and when athletes join the sub-10 club.

Data credits: alltime-athletics.com, all-athletics.com, tilastopaja.org