Rather than the fastest sperm getting the egg, they just pick a random one and inject it in. I wonder how that works out.
Interesting to consider that there is just one ovum (egg) per ovulation (under normal circumstances), and that thus no selection takes place. I.e., there is no selecting-out of substandard eggs. But there are hundreds of millions of sperms competing to fertilize that egg. So "stragglers," slackers," or the like are "filtered out."
In the case of Intracytoplasmic Sperm Injection, I expect that the "lab boys" must carry out some form of visual inspection, no matter how cursory, and select the best-looking candidate.
I mean: They won't choose some overweight spermatozoön sitting in the corner playing with its XBox, will they?
Regards,
A generation of marathon runners and a dearth of sprinters...