| # | Name | Team | Time | Date | Meet |
|---|---|---|---|---|---|
| 1 | Danas Rapsys |
LTU | 1:44.38 | 08/16 | 2019 FINA World Cup
Singapore, SGN |
| 2 | Sun Yang |
CHN | 1:45.55 | 01/18 | 2020 FINA Champions Series
Beijing, CHN |
| 3 | Dominik Kozma |
HUN | 1:45.77 | 08/04 | 2019 FINA World Cup
Tokyo, JPN |
| 4 | Katsuhiro Matsumoto |
JPN | 1:45.82 | 01/24 | 2020 Kitajima Cup
Tokyo, JPN |
| 5 | Townley Haas |
USA | 1:45.92 | 12/06 | 2019 Toyota US Open
Atlanta, GA |
| 6 | Tom Dean |
GBR | 1:46.03 | 03/13 | 2020 EDINBURGH INTERNATIONAL SWIM MEET
Edinburgh, GBR |
| 7 | Kyle Chalmers |
AUS | 1:46.12 | 03/14 | 2020 NSW State Open Championships
Sydney, AUS |
| 8 | Xinje Ji |
CHN | 1:46.54 | 10/19 | 2019 7th CISM Military World Games
Wuhan, CHN |
| 9 | Marco de Tullio |
ITA | 1:46.56 | 08/13 | 2020 Sette Colli Trophy
Rome, ITA |
| 10 | Mikhail Vekovishchev |
RUS | 1:46.61 | 11/03 | 2019 FINA World Cup
Kazan, RUS |
| 11 | Blake Pieroni |
USA | 1:46.62 | 08/04 | 2019 FINA World Cup
Tokyo, JPN |
| 12 | Felix Auboeck |
AUT | 1:46.64 | 07/24 | 4 Nations Meet
Budapest, HUN |
| 13 | Daiya Seto |
JPN | 1:46.65 | 02/15 | 2020 Konami Open
Tokyo, JPN |
| 14 | Gabriele Detti |
ITA | 1:46.69 | 08/13 | 2020 Sette Colli Trophy
Rome, ITA |
| 15 | Zach Apple |
USA | 1:46.76 | 12/06 | 2019 Toyota US Open
Atlanta, GA |
| 16 | James Guy |
GBR | 1:46.79 | 03/13 | 2020 EDINBURGH INTERNATIONAL SWIM MEET
Edinburgh, GBR |
| 17 | Jacob Heidtmann |
GER | 1:46.87 | 03/05 | 2020 Pro Swim Series
Des Moines, IA |
| 18 | Velimir STJEPANOVIC |
SRB | 1:46.99 | 01/24 | 2020 Luxembourg Euro Meet
Luxembourg, LUX |
| 19 | Duncan Scott |
GBR | 1:47.06 | 02/20 | 2020 McCullagh International Meet
Bangor, IRL |
| 20 | Nils Liess |
SUI | 1:47.07 | 02/09 | FFN Golden Tour
Nice, FRA |
| 21 | Alexander Graham |
AUS | 1:47.11 | 03/14 | 2020 NSW State Open Championships
Sydney, AUS |
| 22 | Kristof Milak |
HUN | 1:47.16 | 07/24 | 4 Nations Meet
Budapest, HUN |
| 23 | Stefano Ballo |
ITA | 1:47.22 | 12/12 | Italian Open LC Championships
Riccione, ITA |
| 24 | Kieran Smith |
USA | 1:47.26 | 12/06 | 2019 Toyota US Open
Atlanta, GA |
| 25 | Fernando Scheffer |
BRA | 1:47.31 | 12/06 | 2019 Toyota US Open
Atlanta, GA |
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