Western Zone Zone Boys 10 & under - 50 M Back
These rankings show the swimmers' placement within their Zone.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 | |
|---|---|---|---|---|---|---|---|---|---|
| 301 | Oliver Song Zhang | 48.13 | 10 | BB Min | A: 43.09 (+5.04s | 10.5%) | Stingray Swim Team | 04/25/2025 | 2025 PN KING Spring Derby | |
| 302 | Benjamin Bull | 48.14 | 10 | BB Min | A: 43.09 (+5.05s | 10.5%) | Bellevue Club Swim Team | 05/29/2025 | 2025 IE VS Apple Capital | |
| 303 | Roland Suida | 48.15 | 8 | BB Min | A: 43.09 (+5.06s | 10.5%) | Rogue Rapids | 07/12/2025 | 2025 OSI Arena Summer LC 10 U Championships | |
| 304 | Ian Zhang | 48.16 | 10 | BB Min | A: 43.09 (+5.07s | 10.5%) | Apex | 07/12/2025 | 2025 OSI Arena Summer LC 10 U Championships | |
| 305 | Raizo Copp | 48.21 | 10 | BB Min | A: 43.09 (+5.12s | 10.6%) | King Aquatic Club | 05/31/2025 | 2025 PN VAST Summer Sprints And Distance Chal | |
| 306 | Penghao Yu | 48.21 | 10 | BB Min | A: 43.09 (+5.12s | 10.6%) | Santa Clara Swim Club | 07/19/2025 | Santa Clara Valley Splash Block Party | |
| 307 | Jason Buhr | 48.23 | 10 | BB Min | A: 43.09 (+5.14s | 10.7%) | Pikes Peak Athletics | 05/17/2025 | 2025 CO Hilltopper Invite | |
| 308 | Fedor Evstigneev | 48.26 | 9 | BB Min | A: 43.09 (+5.17s | 10.7%) | Santa Clara Swim Club | 05/23/2025 | Zone 1 South May Firecracker 500 | |
| 309 | Beckham Sleeth | 48.28 | 9 | BB Min | A: 43.09 (+5.19s | 10.7%) | Highlands Ranch Aquatics | 07/12/2025 | 2025 CO TOPS SBL Summer Sizzler | |
| 310 | Kabir Singh | 48.28 | 10 | BB Min | A: 43.09 (+5.19s | 10.7%) | Pro Swimming | 07/11/2025 | 2025 PN OCA July Jamboree Invitational | |
| 311 | Ruslan Kalinnikov | 48.30 | 8 | BB Min | A: 43.09 (+5.21s | 10.8%) | Olympus Aquatics | 07/17/2025 | 2025 UTAGS LC Championships | |
| 312 | Erik Hai | 48.32 | 10 | BB Min | A: 43.09 (+5.23s | 10.8%) | The Claremont Club | 07/23/2025 | 2025 CA SCS Summer A G Champs | |
| 313 | Alex Liu | 48.32 | 9 | BB Min | A: 43.09 (+5.23s | 10.8%) | Brea Aquatics | 07/23/2025 | 2025 CA SCS Summer A G Champs | |
| 314 | Lucas Shamshurin | 48.41 | 10 | BB Min | A: 43.09 (+5.32s | 11.0%) | Bellevue Club Swim Team | 07/24/2025 | 2025 PN LC 12 U Championships | |
| 315 | Neo Perera | 48.42 | 10 | BB Min | A: 43.09 (+5.33s | 11.0%) | Los Altos Mountain View Aquati | 05/17/2025 | 2025 LAMV SCM C B A+ | |
| 316 | Aidan Woods | 48.44 | 10 | BB Min | A: 43.09 (+5.35s | 11.0%) | Fort Collins Area Swim Team | 07/25/2025 | 2025 CO CSI Age Group Championships | |
| 317 | Leo Gazzard | 48.44 | 9 | BB Min | A: 43.09 (+5.35s | 11.0%) | Bellevue Club Swim Team | 05/02/2025 | 2025 PN BC May Flowers | |
| 318 | Max Ong | 48.48 | 10 | BB Min | A: 43.09 (+5.39s | 11.1%) | Pacific Swim | 07/11/2025 | 2025 SI JBST All Ages NTS Meet | |
| 319 | Arwin Safaee | 48.51 | 10 | BB Min | A: 43.09 (+5.42s | 11.2%) | Alto Swim Club | 07/19/2025 | Alto Last Splash | |
| 320 | Jacob Chen | 48.60 | 9 | BB Min | A: 43.09 (+5.51s | 11.3%) | Alto Swim Club | 07/19/2025 | Alto Last Splash | |
| 321 | Demian Jarmy | 48.60 | 10 | BB Min | A: 43.09 (+5.51s | 11.3%) | Pleasanton Seahawks | 06/07/2025 | 2025 06 07 CDST LC C B BB+ Meet | |
| 322 | Cameron Day | 48.62 | 10 | BB Min | A: 43.09 (+5.53s | 11.4%) | Mission Viejo Nadadores | 06/12/2025 | 2025 SCS June AG Invite @ La Mirada Armada | |
| 323 | Christopher Roeder | 48.63 | 10 | BB Min | A: 43.09 (+5.54s | 11.4%) | Aspen Swim Club | 07/25/2025 | 2025 CO CSI Age Group Championships | |
| 324 | Anthony Ma | 48.63 | 10 | BB Min | A: 43.09 (+5.54s | 11.4%) | Cottonwood Heights Aquatics | 06/18/2025 | 2025 UT CHAT INVITATIONAL | |
| 325 | Alexander Rich | 48.64 | 10 | BB Min | A: 43.09 (+5.55s | 11.4%) | Maverick Aquatics | 07/25/2025 | 2025 CO CSI Age Group Championships | |
| 326 | Otto Seeber | 48.65 | 9 | BB Min | A: 43.09 (+5.56s | 11.4%) | Flatiron Athletic Club | 05/16/2025 | 2025 CO NJ Ken Kelley Invite | |
| 327 | Brandon Son | 48.70 | 8 | BB Min | A: 43.09 (+5.61s | 11.5%) | Columbia River Swim Team | 06/07/2025 | 2025 OR CRST Summer Blast 2 | |
| 328 | Owen Zhuang | 48.77 | 10 | BB Min | A: 43.09 (+5.68s | 11.6%) | Santa Clara Swim Club | 07/20/2024 | Alto Last Splash Invitational | |
| 329 | Vincent Kim | 48.81 | 10 | BB Min | A: 43.09 (+5.72s | 11.7%) | Hydro Aquatics Club | 06/12/2025 | 2025 CA SCS RAA June Age Group Championships | |
| 330 | Jamie Pan | 48.81 | 10 | BB Min | A: 43.09 (+5.72s | 11.7%) | Alto Swim Club | 04/19/2025 | Alto Spring Jam Meet | |
| 331 | Eddie Bi | 48.81 | 9 | BB Min | A: 43.09 (+5.72s | 11.7%) | California Dolphins Swim Team | 04/12/2025 | PC BSW LCM C B BB+ Meet | |
| 332 | Orion Blue-Smith | 48.82 | 10 | BB Min | A: 43.09 (+5.73s | 11.7%) | Palo Alto Stanford Aquatics | 06/06/2025 | BAC C B A Meet | |
| 333 | Blaze Garcia | 48.83 | 10 | BB Min | A: 43.09 (+5.74s | 11.8%) | Pueblo County Swim Team | 06/19/2025 | 2025 CO Grand Junction Invitational | |
| 334 | Niranjan Bharathan | 48.85 | 10 | BB Min | A: 43.09 (+5.76s | 11.8%) | Tualatin Hills Swim Club | 06/06/2025 | 2025 THSC June Invitational | |
| 335 | Leo Liao | 48.86 | 10 | BB Min | A: 43.09 (+5.77s | 11.8%) | Alto Swim Club | 04/19/2025 | Alto Spring Jam Meet | |
| 336 | Cole King-thomas | 48.87 | 10 | BB Min | A: 43.09 (+5.78s | 11.8%) | Sonoma Sea Dragons | 06/22/2024 | NVST S LAST CHANCE JO SUMMER PLUNGE | |
| 337 | Declan Sederholm | 48.87 | 10 | BB Min | A: 43.09 (+5.78s | 11.8%) | Hilltop Aquatic Swim Team | 06/21/2025 | 2025 UT HAST RWB Invitational | |
| 338 | Chayton Zhou | 48.87 | 9 | BB Min | A: 43.09 (+5.78s | 11.8%) | Pleasanton Seahawks | 04/12/2025 | PC BSW LCM C B BB+ Meet | |
| 339 | Rain Liu | 48.96 | 10 | BB Min | A: 43.09 (+5.87s | 12.0%) | Rancho San Dieguito | 07/11/2025 | 2025 SI SDSA All Ages NTS Meet | |
| 340 | Charles Knigge | 48.96 | 10 | BB Min | A: 43.09 (+5.87s | 12.0%) | Spokane Waves Aquatic Team | 06/06/2025 | 2025 TRI CITY INVITATIONAL | |
| 341 | Bradley Royce | 48.98 | 9 | BB Min | A: 43.09 (+5.89s | 12.0%) | Highlands Ranch Aquatics | 07/25/2025 | 2025 CO CSI Age Group Championships | |
| 342 | Arick Yuan | 49.00 | 10 | BB Min | A: 43.09 (+5.91s | 12.1%) | Santa Clara Swim Club | 06/27/2025 | Valley Splash | |
| 343 | Liam Lawson | 49.02 | 10 | BB Min | A: 43.09 (+5.93s | 12.1%) | Lake Oswego Swim Club | 07/12/2025 | 2025 OSI Arena Summer LC 10 U Championships | |
| 344 | Joshua Vitale | 49.04 | 10 | BB Min | A: 43.09 (+5.95s | 12.1%) | Lake Oswego Swim Club | 06/26/2025 | 2025 Howard Jones Open | |
| 345 | Isaac Marcuson | 49.08 | 10 | BB Min | A: 43.09 (+5.99s | 12.2%) | Aspire Aquatics of Colorado | 07/25/2025 | 2025 CO CSI Age Group Championships | |
| 346 | Mateo Sison | 49.10 | 10 | BB Min | A: 43.09 (+6.01s | 12.2%) | San Ramon Valley Aquatics | 06/07/2025 | Orinda Aquatics LC C B BB+ Meet | |
| 347 | Yunus Mukhamadieva | 49.16 | 10 | BB Min | A: 43.09 (+6.07s | 12.3%) | Brentwood Seawolves | 06/07/2025 | Orinda Aquatics LC C B BB+ Meet | |
| 348 | Roman Tsikalov | 49.17 | 10 | BB Min | A: 43.09 (+6.08s | 12.4%) | Otter Swim Club | 06/06/2025 | 2025 DACA LC CBA+ Meet | |
| 349 | Caleb McGovern | 49.23 | 10 | BB Min | A: 43.09 (+6.14s | 12.5%) | Portland Aquatic Club | 11/14/2025 | GACC PAC 12 U Sprint Dual | |
| 350 | Jose Perez | 49.24 | 10 | BB Min | A: 43.09 (+6.15s | 12.5%) | Lincoln City Swim Club | 03/07/2026 | Valley Coast Swim League 2026 | |
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.