swimSebastian Keychenko
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 50 Freestyle | SCY | 25.47 | A+0.88s to AA | 2026-02-15 | 2026 SI Presidents' Day Senior Time Trials - venue |
| 100 Freestyle | SCY | 56.13 | BB+0.34s to A | 2026-03-08 | 2026 SI 14U AGE GRP CHAMPIONSHIPS venue |
| 200 Freestyle | SCY | 2:10.93 | BB+8.74s to A | 2026-01-17 | 2026 SI MRA A/BB Meet venue |
| 500 Freestyle | SCY | 6:24.86 | B+26.47s to BB | 2025-03-16 | 2025 SI JBST NTS All Ages venue |
| 1650 Freestyle | SCY | 20:57.14 | B+9.75s to BB | 2025-12-05 | 2025 SI JBST Wag Max Meet venue |
| 50 Backstroke | SCY | 32.96 | B+1.67s to BB | 2026-02-01 | 2026 SI HSA All Ages NTS Meet fast pool |
| 100 Backstroke | SCY | 1:16.03 | +4.64s to B | 2025-02-09 | 2025 SI SBA All Ages NTS Meet Feb 7-9 venue |
| 200 Backstroke | SCY | 2:53.43 | +18.24s to B | 2024-12-08 | 2024 SI JBST Wag Max Meet venue |
| 50 Breaststroke | SCY | 31.53 | AA+1.24s to AAA | 2026-03-08 | 2026 SI 14U AGE GRP CHAMPIONSHIPS venue |
| 100 Breaststroke | SCY | 1:10.59 | BB+1.50s to A | 2025-12-19 | 2025 SI Winter Age Group Championships venue |
| 200 Breaststroke | SCY | 2:29.81 | A+5.82s to AA | 2026-03-30 | 2026 Southwest Age Group Regional fast pool |
| 50 Butterfly | SCY | 30.46 | BB+2.07s to A | 2026-01-17 | 2026 SI MRA A/BB Meet venue |
| 100 Butterfly | SCY | 1:10.73 | +0.24s to B | 2025-12-07 | 2025 SI JBST Wag Max Meet venue |
| 100 Individual Medley | SCY | 1:15.23 | 2024-01-21 | 2024 SI JBST All Ages NTS venue | |
| 200 Individual Medley | SCY | 2:26.72 | B+0.03s to BB | 2026-02-01 | 2026 SI HSA All Ages NTS Meet fast pool |
| 50 Freestyle | LCM | 28.47 | A+0.28s to AA | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 100 Freestyle | LCM | 1:03.25 | A+1.56s to AA | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 200 Freestyle | LCM | 2:25.90 | BB+5.31s to A | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 400 Freestyle | LCM | 5:04.86 | BB+4.97s to A | 2026-04-24 | 2026 SI PS ABB Meet - B Group venue |
| 800 Freestyle | LCM | 11:57.34 | B+44.25s to BB | 2024-04-19 | 2024 SI Pacific Swim A-BB LCM All Ages Meet venue |
| 50 Backstroke | LCM | 37.26 | B+0.57s to BB | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 100 Backstroke | LCM | 1:30.95 | +7.26s to B | 2025-07-12 | 2025 SI JBST All Ages NTS Meet venue |
| 50 Breaststroke | LCM | 37.08 | A+0.79s to AA | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 100 Breaststroke | LCM | 1:19.64 | A+2.45s to AA | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 200 Breaststroke | LCM | 2:52.08 | A+4.59s to AA | 2026-04-26 | 2026 SI PS ABB Meet - B Group venue |
| 50 Butterfly | LCM | 35.32 | B+0.73s to BB | 2026-05-23 | SI 2026 TAC CSTE All Ages NTS Meet fast pool |
| 200 Individual Medley | LCM | 2:47.08 | BB+10.19s to A | 2026-04-26 | 2026 SI PS ABB Meet - B Group venue |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 14.
Pool tags are a venue speed heuristic (median deviation of all swims there vs each swimmer's typical time) — see the venue page for the method.
Fastest relay legs
| Leg | Course | Time | Start | Relay | Date | Meet |
|---|---|---|---|---|---|---|
| 50 Freestyle | SCY | 25.21 | flying | 200 Free Relay (leg 4) | 2025-12-21 | 2025 SI Winter Age Group Championships |
| 100 Freestyle | SCY | 1:00.60 | flat | 400 Free Relay | 2026-03-07 | 2026 SI 14U AGE GRP CHAMPIONSHIPS |
| 100 Freestyle | SCY | 56.05 | flying | 400 Free Relay (leg 2) | 2025-03-08 | 2025 SI 14U AGE GRP CHAMPIONSHIPS |
| 50 Breaststroke | SCY | 33.17 | flying | 200 Medley Relay (leg 2) | 2026-02-16 | 2026 SI Presidents' Day Senior Classic - copi |
| 100 Breaststroke | SCY | 1:11.54 | flying | 400 Medley Relay (leg 2) | 2026-03-08 | 2026 SI 14U AGE GRP CHAMPIONSHIPS |
| 50 Freestyle | LCM | 31.54 | flat | 200 Free Relay | 2025-07-26 | 2025 SI LC AG CHAMPS |
| 50 Freestyle | LCM | 30.53 | flying | 200 Medley Relay (leg 4) | 2025-07-27 | 2025 SI LC AG CHAMPS |
| 100 Freestyle | LCM | 1:11.67 | flying | 400 Medley Relay (leg 4) | 2025-07-26 | 2025 SI LC AG CHAMPS |
Reconstructed from relay split marks. Flat = lead-off (comparable to individual times); flying starts run ~0.5–0.7s fast and are not PRs.
IMX / IMR
IMX 13-14 · SCY
1920 points (4/6 events — incomplete)
| Event | Time | Points |
|---|---|---|
| 500 FR SCY | 6:24.86 | 424 |
| 200 BK SCY | 2:53.43 | 299 |
| 200 BR SCY | 2:29.81 | 671 |
| 200 IM SCY | 2:26.72 | 526 |
| 200 FL SCY | — | 0 |
| 400 IM SCY | — | 0 |
IMR 13-14 · SCY
2462 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 2:10.93 | 544 |
| 100 BK SCY | 1:16.03 | 348 |
| 100 BR SCY | 1:10.59 | 626 |
| 100 FL SCY | 1:10.73 | 418 |
| 200 IM SCY | 2:26.72 | 526 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
100 Freestyle SCY 56.13
Front half 27.13s · back half 29.00s
200 Freestyle SCY 2:10.93
Front half 63.47s · back half 67.46s
100 Backstroke SCY 1:16.03
Front half 37.69s · back half 38.34s
200 Backstroke SCY 2:53.43
Front half 85.30s · back half 88.13s
100 Breaststroke SCY 1:10.59
Front half 33.29s · back half 37.30s
200 Breaststroke SCY 2:29.81
Front half 71.05s · back half 78.76s
100 Butterfly SCY 1:10.73
Front half 32.07s · back half 38.66s
100 Individual Medley SCY 1:15.23
Front half 36.38s · back half 38.85s
100 Freestyle LCM 1:03.25 · 12.0 min after 50 Backstroke
Front half 29.92s · back half 33.33s
200 Freestyle LCM 2:25.90 · 7.0 min after 50 Breaststroke
Front half 69.67s · back half 76.23s
400 Freestyle LCM 5:04.86
Front half 149.47s · back half 155.39s
800 Freestyle LCM 11:57.34
100 Breaststroke LCM 1:19.64 · 10.5 min after 200 Freestyle
Front half 38.02s · back half 41.62s
200 Breaststroke LCM 2:52.08
Front half 80.88s · back half 91.20s
200 Individual Medley LCM 2:47.08
Front half 83.79s · back half 83.29s
Progression
Faster times are higher. One card per event, all courses & history.