This was only a few minutes of elemental research, but I think these are all the sub-43.6 splits ever (I'm sure someone will llet me know right quick if I missed any!). There are 25 times by 17 different guys. Michael Johnson has 5, Quincy Watts 3. (Note: there are two versions of the '93 WC splits floating about; this is the ATFS version; in hte ohter, Johnson is at 42.94, Reynolds at 42.23):
42.91 Michael Johnson (US) ’93 WC
43.00 Quincy Watts (US) ’92 OG
43.1+ Maurice Peoples (US) ’73 NCAA
Antonio Pettigrew (US) ’97 WC
43.2(A) Ron Freeman (US) ’68 OG
Pettigrew ’98 Goodwill
Johnson ’98 Goodwill
Jeremy Wariner (US) ’06 Texas
43.36 Butch Reynolds (US) ’93 WC
43.4 Watts ’91 WC
43.41 Steve Lewis (US) ’92 OG
43.42 Chris Brown (Bahamas) ’05 WC
43.49 Johnson ’99 WC
Darrold Williamson (US) ’05 NCAA
Wariner ’05 WC
43.5 Larry Black (US) ’72 Penn
Julius Sang (Kenya) ’72 OG
Roddie Haley (US) ’86 Penn
Johnson ’88 Drake
Johnson ’90 NCAA
Tyree Washington (US) ’98 Goodwill
43.51 Davian Clarke (Jamaica) ’97 WC
43.53 Calvin Harrison (US) ’00 OG
43.57 Mark Richardson (GB) ’97 WC
43.59 Watts ’93 WC
Trivia question: what's the significance of the Roddy Haley mark?
42.91 Michael Johnson (US) ’93 WC
43.00 Quincy Watts (US) ’92 OG
43.1+ Maurice Peoples (US) ’73 NCAA
Antonio Pettigrew (US) ’97 WC
43.2(A) Ron Freeman (US) ’68 OG
Pettigrew ’98 Goodwill
Johnson ’98 Goodwill
Jeremy Wariner (US) ’06 Texas
43.36 Butch Reynolds (US) ’93 WC
43.4 Watts ’91 WC
43.41 Steve Lewis (US) ’92 OG
43.42 Chris Brown (Bahamas) ’05 WC
43.49 Johnson ’99 WC
Darrold Williamson (US) ’05 NCAA
Wariner ’05 WC
43.5 Larry Black (US) ’72 Penn
Julius Sang (Kenya) ’72 OG
Roddie Haley (US) ’86 Penn
Johnson ’88 Drake
Johnson ’90 NCAA
Tyree Washington (US) ’98 Goodwill
43.51 Davian Clarke (Jamaica) ’97 WC
43.53 Calvin Harrison (US) ’00 OG
43.57 Mark Richardson (GB) ’97 WC
43.59 Watts ’93 WC
Trivia question: what's the significance of the Roddy Haley mark?
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