| # | Name | Team | Time | Date | Meet |
|---|---|---|---|---|---|
| 1 | Daiya Seto |
JPN | 4:06.09 | 01/24 | 2020 Kitajima Cup
Tokyo, JPN |
| 2 | Shun Wang |
CHN | 4:10.13 | 10/19 | 2019 7th CISM Military World Games
Wuhan, CHN |
| 3 | Haiyang Qin |
CHN | 4:10.41 | 10/19 | 2019 7th CISM Military World Games
Wuhan, CHN |
| 4 | Jacob Heidtmann |
GER | 4:12.40 | 03/06 | 2020 Pro Swim Series
Des Moines, IA |
| 5 | David Varraszto |
HUN | 4:12.66 | 08/12 | 2020 Sette Colli Trophy
Rome, ITA |
| 6 | Chase Kalisz |
USA | 4:13.07 | 12/06 | 2019 Toyota US Open
Atlanta, GA |
| 7 | Lewis Clareburt |
NZL | 4:13.41 | 12/14 | 2019 Queensland Champs
Brisbane, AUS |
| 8 | Yuuki Ikari |
JPN | 4:13.83 | 09/06 | 2019 JPN Student Champs
Tokyo, JPN |
| 9 | Ippei Miyamoto |
JPN | 4:13.94 | 09/06 | 2019 JPN Student Champs
Tokyo, JPN |
| 10 | Jeremy Desplanches |
SUI | 4:14.76 | 02/07 | FFN Golden Tour
Nice, FRA |
| 10 | Carson Foster |
USA | 4:14.76 | 12/06 | 2019 Toyota US Open
Atlanta, GA |
| 12 | Pier Matteazzi |
ITA | 4:15.03 | 08/12 | 2020 Sette Colli Trophy
Rome, ITA |
| 13 | Arjan Knipping |
NED | 4:15.12 | 12/14 | Swim Cup Amsterdam
Amsterdam, NED |
| 14 | Balazs Hollo |
HUN | 4:15.17 | 11/08 | 2019 FINA World Cup
Doha, QAT |
| 15 | Joan Lluis Pons Roman |
ESP | 4:15.68 | 08/04 | 2019 FINA World Cup
Tokyo, JPN |
| 16 | Hubert Kos |
HUN | 4:15.77 | 07/24 | 4 Nations Meet
Budapest, HUN |
| 17 | Jay Litherland |
USA | 4:15.81 | 03/06 | 2020 Pro Swim Series
Des Moines, IA |
| 18 | Patrick Staber |
AUT | 4:16.03 | 11/09 | 2019 FINA World Cup
Doha, QAT |
| 19 | Kieran Smith |
USA | 4:16.36 | 01/17 | 2020 Pro Swim Series
Knoxville, TN |
| 20 | Pier Andrea Matteazzi |
ITA | 4:16.67 | 02/15 | 18th Titano Meeting
Serravalle, ITA |
| 20 | Jarod Arroyo |
PUR | 4:16.67 | 01/17 | 2020 Pro Swim Series
Knoxville, TN |
| 22 | Sam Stewart |
USA | 4:16.74 | 03/07 | 2020 Cary Sectionals
Raleigh, NC |
| 23 | Kosuke Hagino |
JPN | 4:16.86 | 11/21 | 2019 Tokyo Open
Tokyo, JPN |
| 24 | Hsing-Hao Wang |
TPE | 4:17.06 | 10/20 | 2019 Taiwan Nationals
Taoyuan, TPE |
| 25 | Takumi Uchiyama |
JPN | 4:17.08 | 08/04 | 2019 FINA World Cup
Tokyo, JPN |
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