USA Boys 10 & under - 50 M Back
These rankings show the swimmers' placement within the United States.They are based on the swimmer's personal best, their current age category, and team; and are calculated from all the meets results.
For each swimmer, you can find the swimmer's ranking, their best time, the corresponding time standard, as well as how much faster the swimmer needs to be to reach the next level. The last columns provide information about the event they achieved this personal best.
Swimmer Rankings
| Ranking | Name | Time | Age | Standard | to Next Standard | Team | Date | Meet | |
|---|---|---|---|---|---|---|---|---|---|
| 101 | Rory Cullen | 40.75 | 10 | AA Min | AAA: 38.99 (+1.76s | 4.3%) | Sarasota Sharks | 07/10/2025 | 2025 FL Summer Age Group Championships | |
| 102 | Lucas Pan | 40.76 | 8 | AA Min | AAA: 38.99 (+1.77s | 4.3%) | Santa Clara Swim Club | 07/31/2025 | 2025 Long Course Far Western Championship | |
| 103 | Nicholas Liu | 40.76 | 9 | AA Min | AAA: 38.99 (+1.77s | 4.3%) | Alto Swim Club | 07/31/2025 | 2025 Long Course Far Western Championship | |
| 104 | Eli Shapiro | 40.81 | 10 | AA Min | AAA: 38.99 (+1.82s | 4.5%) | Lakeridge Swim Team | 05/23/2025 | 2025 Intermountain Classic Long Course Meet | |
| 105 | Robert Gergardt | 40.83 | 10 | AA Min | AAA: 38.99 (+1.84s | 4.5%) | Quicksilver Swimming | 07/31/2025 | 2025 Long Course Far Western Championship | |
| 106 | Charles Liu Bates | 40.88 | 10 | AA Min | AAA: 38.99 (+1.89s | 4.6%) | California Dolphins Swim Team | 07/11/2025 | 2025 Age Group Championships | |
| 107 | Clayton Chester | 40.91 | 9 | AA Min | AAA: 38.99 (+1.92s | 4.7%) | Heartland Swim Assoc | 07/24/2025 | 2025 SI LC AG CHAMPS | |
| 108 | Shunsuke Suzuki | 40.93 | 10 | AA Min | AAA: 38.99 (+1.94s | 4.7%) | Palo Alto Stanford Aquatics | 07/31/2025 | 2025 Long Course Far Western Championship | |
| 109 | Preston Tran | 40.99 | 9 | AA Min | AAA: 38.99 (+2.00s | 4.9%) | Irvine Novaquatics | 06/12/2025 | 2025 June Age Group Invite | |
| 110 | Benjamin Du | 41.05 | 9 | AA Min | AAA: 38.99 (+2.06s | 5.0%) | Santa Clara Swim Club | 05/23/2025 | Zone 1 South May Firecracker 500 | |
| 111 | Daniel Thorpe | 41.07 | 9 | AA Min | AAA: 38.99 (+2.08s | 5.1%) | Aquajets Swim Team | 07/23/2025 | 2025 MN NSAC 10 U LC State Championship | |
| 112 | Benjamin Balmaceda | 41.09 | 9 | AA Min | AAA: 38.99 (+2.10s | 5.1%) | Alamo Area Aquatic Association | 07/10/2025 | 2025 ST AAAA STAGS LC Championship | |
| 113 | Eliott Jackson | 41.10 | 9 | A Min | AA: 41.09 (+0.01s | 0.0%) | Team Eugene Aquatics | 07/12/2025 | 2025 OSI Arena Summer LC 10 U Championships | |
| 114 | Alex Deng | 41.12 | 10 | A Min | AA: 41.09 (+0.03s | 0.1%) | Issaquah Swim Team | 07/24/2025 | 2025 PN LC 12 U Championships | |
| 115 | Jack Armbruster | 41.12 | 9 | A Min | AA: 41.09 (+0.03s | 0.1%) | San Clemente Aquatic Team | 07/24/2025 | 2025 CA SCS RAA Summer A G Champs | |
| 116 | Nicholas Galvin | 41.12 | 9 | A Min | AA: 41.09 (+0.03s | 0.1%) | Sarasota Sharks | 07/10/2025 | 2025 FL Summer Age Group Championships | |
| 117 | Samuel Fuller | 41.13 | 10 | A Min | AA: 41.09 (+0.04s | 0.1%) | Rose Bowl Aquatics | 06/12/2025 | 2025 CA SCS RAA June Age Group Championships | |
| 118 | Anders Hammond | 41.18 | 9 | A Min | AA: 41.09 (+0.09s | 0.2%) | Riptide Swim Team | 06/19/2025 | 2025 CO Grand Junction Invitational | |
| 119 | Emmanuel Steele | 41.19 | 10 | A Min | AA: 41.09 (+0.10s | 0.2%) | Vision Swim | 07/23/2025 | 2025 CA SCS Summer A G Champs | |
| 120 | Jason Korajkic | 41.25 | 10 | A Min | AA: 41.09 (+0.16s | 0.4%) | Walnut Creek Aquabears | 05/10/2025 | PC SRVA LCM C B BB+ | |
| 121 | Keoni Kikuta | 41.27 | 10 | A Min | AA: 41.09 (+0.18s | 0.4%) | Shasta YMCA Sharks | 07/31/2025 | 2025 Long Course Far Western Championship | |
| 122 | Nathan Campbell | 41.31 | 8 | A Min | AA: 41.09 (+0.22s | 0.5%) | Southwestern Aquatics Team - S | 07/16/2025 | 2025 Texas Age Group Championships | |
| 123 | Samuel Fuerstneau | 41.31 | 9 | A Min | AA: 41.09 (+0.22s | 0.5%) | Edina Swim Club | 07/23/2025 | 2025 MN NSAC 10 U LC State Championship | |
| 124 | Sinan Ozgur | 41.32 | 9 | A Min | AA: 41.09 (+0.23s | 0.6%) | Pleasanton Seahawks | 05/24/2025 | 2025 Tiger Aquatics C B BB+ Memorial Day Meet | |
| 125 | Adam Li | 41.35 | 10 | A Min | AA: 41.09 (+0.26s | 0.6%) | Santa Clara Swim Club | 05/23/2025 | Zone 1 South May Firecracker 500 | |
| 126 | Luke Marek | 41.39 | 10 | A Min | AA: 41.09 (+0.30s | 0.7%) | Surge Aquatics | 07/10/2025 | 2025 ST AAAA STAGS LC Championship | |
| 127 | Nolan Stumpf | 41.42 | 10 | B Min | BB: 41.09 (+0.33s | 0.8%) | Aquajets Swim Team | 06/13/2025 | 2025 MN NSAC Summer Slam Invite | |
| 128 | Jacob Liu | 41.50 | 9 | A Min | AA: 41.09 (+0.41s | 1.0%) | Trident Swim Club | 07/24/2025 | 2025 CA SCS RAA Summer A G Champs | |
| 129 | Dongxin Xian | 41.57 | 9 | A Min | AA: 41.09 (+0.48s | 1.2%) | Arcadia Riptides Swim Club | 07/23/2025 | 2025 CA SCS Summer A G Champs | |
| 130 | Gavin Mahrous | 41.59 | 8 | A Min | AA: 41.09 (+0.50s | 1.2%) | Sioux Falls Swim Team | 05/09/2025 | 2025 SD SFST Ready For Long Course | |
| 131 | Angel Garcia III | 41.59 | 9 | A Min | AA: 41.09 (+0.50s | 1.2%) | Golden West Swim Club | 07/25/2024 | 2024 CA SCS GWSC Summer A G Champs | |
| 132 | Robert Botterill | 41.69 | 9 | A Min | AA: 41.09 (+0.60s | 1.4%) | Granite City Aquatics | 07/23/2025 | 2025 MN NSAC 10 U LC State Championship | |
| 133 | Winston Chase | 41.69 | 9 | A Min | AA: 41.09 (+0.60s | 1.4%) | Utah Valley Aquatics | 07/17/2025 | 2025 UTAGS LC Championships | |
| 134 | Stryker Fonseca | 41.73 | 10 | A Min | AA: 41.09 (+0.64s | 1.5%) | Barracuda Aquatic Club | 07/17/2025 | 2025 UTAGS LC Championships | |
| 135 | Colt Sivells | 41.73 | 9 | A Min | AA: 41.09 (+0.64s | 1.5%) | Southwest Stars Swim Club | 07/10/2025 | 2025 FL Summer Age Group Championships | |
| 136 | Martin Decotigny | 41.74 | 10 | A Min | AA: 41.09 (+0.65s | 1.6%) | Alto Swim Club | 07/11/2025 | 2025 Age Group Championships | |
| 137 | Logan Smith | 41.74 | 10 | A Min | AA: 41.09 (+0.65s | 1.6%) | Unattached | 07/31/2025 | 2025 Central Zone 14 Under Championship Mee | |
| 138 | Luke Ford | 41.75 | 9 | A Min | AA: 41.09 (+0.66s | 1.6%) | The Claremont Club | 06/12/2025 | 2025 CA SCS RAA June Age Group Championships | |
| 139 | Toby Wong | 41.78 | 10 | A Min | AA: 41.09 (+0.69s | 1.7%) | Quicksilver Swimming | 07/31/2025 | 2025 Long Course Far Western Championship | |
| 140 | Dylan Deahn | 41.84 | 8 | A Min | AA: 41.09 (+0.75s | 1.8%) | Unattached | 07/31/2025 | 2025 Central Zone 14 Under Championship Mee | |
| 141 | Liam Kwok | 41.85 | 10 | A Min | AA: 41.09 (+0.76s | 1.8%) | Socal Aquatics Association | 06/12/2025 | 2025 CA SCS RAA June Age Group Championships | |
| 142 | Andrew Han | 41.91 | 10 | A Min | AA: 41.09 (+0.82s | 2.0%) | Riverside Aquatics Association | 07/24/2025 | 2025 CA SCS RAA Summer A G Champs | |
| 143 | Aiden Suffel | 41.91 | 9 | A Min | AA: 41.09 (+0.82s | 2.0%) | Lakeshore Swim Club | 05/16/2025 | Busbey Invitational 2025 | |
| 144 | Evan Saltsman | 41.99 | 9 | A Min | AA: 41.09 (+0.90s | 2.1%) | Alpha Aquatics | 06/13/2024 | 2024 CA SCS CANY June Age Group Invite | |
| 145 | Mason Nguyen | 42.00 | 9 | A Min | AA: 41.09 (+0.91s | 2.2%) | Aquazot Swim Club | 07/24/2025 | 2025 CA SCS RAA Summer A G Champs | |
| 146 | Deren Chai | 42.03 | 10 | A Min | AA: 41.09 (+0.94s | 2.2%) | Pleasanton Seahawks | 06/07/2025 | 2025 06 07 CDST LC C B BB+ Meet | |
| 147 | Jayden Cheng | 42.09 | 9 | A Min | AA: 41.09 (+1.00s | 2.4%) | Brea Aquatics | 06/12/2025 | 2025 SCS June AG Invite @ La Mirada Armada | |
| 148 | Rafael Parlato | 42.13 | 10 | A Min | AA: 41.09 (+1.04s | 2.5%) | Fenix Swim Club | 01/17/2026 | 2026 Azura Winter Open LCM Invite | |
| 149 | Jack Yu | 42.14 | 9 | A Min | AA: 41.09 (+1.05s | 2.5%) | Brea Aquatics | 07/23/2025 | 2025 CA SCS Summer A G Champs | |
| 150 | Tucker McCullough | 42.14 | 9 | A Min | AA: 41.09 (+1.05s | 2.5%) | Team Rebel Aquatics | 07/24/2025 | 2025 CA SCS RAA Summer A G Champs | |
Disclaimer: This Website is not affiliated with USA Swimming or any Local Swim Committee. The rankings and times displayed on this website are unofficial and should not be viewed as such. We update our information regularly, but we cannot guarantee that the data is accurate, timely, or complete. The only purpose of this website is entertainment. None of the information here should be used for university admission applications.