A Postmodern Desi

It must be the speedos.

Event: Spitz in 1972/Phelps in 2008
100m freestyle: 51.22 / DNR (47.05 WR)
200m freestyle: 1:52.78 / 1:42.96
100m butterfly: 54.27 / 50.58
200m butterfly: 2:00.70 / 1:54.23
200m IM: DNR (2:07.17 WR) / 1:54.23
400m IM: DNR (4:30.81 WR) / 4:03.84
4x100 free relay: 3:26.42 / 3:08.42
4x200 free relay: 7:35.78 / 6:58.56
4x100 medley relay: 3:48.16 / TK