at 1500m we have:
István Rózsavölgyi (HUN) WR 3:40.6 Tata 3 Aug 1956, pr 3:39.20 Rome 6 Sep 1960
Sebastian Coe (GBR) WR 3:32.10 Zurich 15 Aug 1979, pr 3:29.77 Rieti 7 Sep 1986
Sydney Maree (USA) WR 3:31.24 Cologne 28 Aug 1983, pr 3:29.77 Cologne 25 Aug 1985
cheers.
there are no examples at 800m. at 400m there is one example, Larry James (USA) WR 44.19 Echo Summit 14 Sep 1968, pr 43.90 Mexico 18 Oct 1968. in both races he was beaten by Lee Evans, who was wearing the wrong shoes in the first race which is why James got the WR and not Evans.
cheers.
Nick Willis has had a pretty amazing career whichever way you look at it.
He's made the last 3 Olympic finals and only missed the 2004 Olympic final by less than 2/10ths of a second (and the four qualifiers who finished ahead of him were all likely doped up). And few would bet against him making the Tokyo final in two years time, especially if the sport is cleaned up by then.
In each of those three Olympic finals he finished no more than 3 seconds behind the Gold medallist. Of course, he should be retrospectively award the 2004 Olympic gold medal after Kiprop's bust. In 2012 he won the bronze medal just 0.24 seconds behind the winner Centro.
*retrospectively awarded the 2008 Gold.
at 5000m and 10,000m there is, AFAIK, only one example of each:
5000m - Emil Zátopek (TCH) WR 13:57.2 Paris 30 May 1954, pr 13:57.0 Stockholm 3 Sep 1954
10,000m - Ville Ritola (FIN) WR 30:23.2 Paris 6 Jul 1924, pr 30:19.4 Amsterdam 29 Jul 1928 Olympic silver
as usual, corrections, additions and amendments always welcome.
cheers.