Saruni is the #2 performer ever. That was the third sub 1:44 indoors ever.
Brazier is now the 5th fastest man in indoor history and Jonny Gray's 1:45.00 AR which had stood since 1992 is history!!!
Here is the all time indoor 800 list according to TFN.
1. 1:42.67 Wilson Kipketer (Denmark) 3/09/97
1:43.96 ————Kipketer 3/07/97
2. 1:43.98 - Michael Saruni
3. 1:44.15 Yuriy Borzakovskiy (Russia) 1/27/01
4. 1:44.21 Emmanuel Korir (Kenya) 2/03/18
1:44.34 ————Borzakovskiy 2/18/03
1:44.35 ————Borzakovskiy 1/30/00
5. 1:44.41 Donavan Brazier.
https://trackandfieldnews.com/tfn-lists/