My personal list based on when I started following the sport closely (roughly 2000 on). Criteria is how frenzied the reaction was in the moment + lasting historical impact. I have a little bit of a bias of not valuing recent WRs as much because the impact of the shoes is so extreme.
1. Wanjiru at Beijing. Totally jaw dropping in the moment, and had a permanent impact on how the marathon is run. This is one race I watched live that I’m certain had historical import like Abebe Bikele or Bannister.
2. Rudisha at London. Sad to me that this record will soon fall. In the moment everyone knew a human being could never perform better.
3. Paula Radcliffe 2:15. Surprised by how little it’s been mentioned here. It seemed almost fake at the time.
4. Bekele 5k at Beijing. I’m sure this will fade with time. Probably already has. I think the one thing about it that will endure is that Bekele turned the soon-to-be philosopher king Kipchoge, who reached supernatural status as a runner, into a staggering mess.
5. Bekele 10k in 2003. Anyone who is saying this is overrated is crazy.