swimMackenzie Della Costa
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 50 Freestyle | SCY | 28.10 | BB+0.41s to A·+3.21s to Sectionals | 2025-03-01 | 2025 Spring Area 3 Championshipsvenue |
| 100 Freestyle | SCY | 1:01.36 | BB+1.27s to A·+7.27s to Sectionals | 2025-03-02 | 2025 Spring Area 3 Championshipsvenue |
| 200 Freestyle | SCY | 2:21.25 | B+0.76s to BB·+24.56s to Sectionals | 2025-03-02 | 2025 Spring Area 3 Championshipsvenue |
| 50 Backstroke | SCY | 31.51 | BB+0.72s to A·+2.92s to Sectionals | 2025-02-28 | 2025 Spring Area 3 Championshipsvenue |
| 100 Backstroke | SCY | 1:10.02 | BB+4.93s to A·+9.23s to Sectionals | 2025-03-02 | 2025 Spring Area 3 Championshipsvenue |
| 200 Backstroke | SCY | 2:32.08 | BB+10.79s to A·+18.79s to Sectionals | 2025-03-01 | 2025 Spring Area 3 Championshipsvenue |
| 50 Breaststroke | SCY | 36.86 | BB+0.97s to A·+3.27s to Sectionals | 2024-07-06 | 2024 FE Arena Watermelon Crawlslow pool |
| 100 Breaststroke | SCY | 1:21.41 | B+0.22s to BB·+10.52s to Sectionals | 2024-11-23 | SPA - PYP NOVEMBER 2024venue |
| 200 Breaststroke | SCY | 2:59.67 | B+4.98s to BB·+23.38s to Sectionals | 2024-10-26 | 2024 GTSA TYR Swim Classic at Berkeleyvenue |
| 50 Butterfly | SCY | 33.29 | B+0.50s to BB·+5.90s to Sectionals | 2024-07-07 | 2024 FE Arena Watermelon Crawlslow pool |
| 100 Individual Medley | SCY | 1:11.71 | 2024-11-23 | SPA - PYP NOVEMBER 2024venue | |
| 200 Individual Medley | SCY | 2:30.93 | BB+6.14s to A·+18.34s to Sectionals | 2025-03-01 | 2025 Spring Area 3 Championshipsvenue |
| 50 Freestyle | LCM | 31.91 | BB+0.32s to A·+3.52s to Sectionals | 2024-07-14 | 2024 FL Summer Age Group Championshipsvenue |
| 100 Freestyle | LCM | 1:14.10 | B+0.31s to BB·+12.81s to Sectionals | 2024-05-19 | 2024 SAINT PETE'S 2nd LONG COURSE MEETvenue |
| 200 Freestyle | LCM | 2:41.91 | B+1.72s to BB·+29.82s to Sectionals | 2025-05-17 | 2025 SAINT PETE'S 2nd LONG COURSE MEETvenue |
| 400 Freestyle | LCM | 5:29.97 | BB+18.88s to A·+51.18s to Sectionals | 2024-06-09 | 2024 TAMPA BAY SWIM CLASSICvenue |
| 50 Backstroke | LCM | 35.78 | A+0.99s to AA·+2.89s to Sectionals | 2025-05-17 | 2025 SAINT PETE'S 2nd LONG COURSE MEETvenue |
| 100 Backstroke | LCM | 1:20.01 | BB+4.32s to A·+10.22s to Sectionals | 2025-05-17 | 2025 SAINT PETE'S 2nd LONG COURSE MEETvenue |
| 50 Breaststroke | LCM | 44.42 | B+0.73s to BB·+6.13s to Sectionals | 2024-05-18 | 2024 SAINT PETE'S 2nd LONG COURSE MEETvenue |
| 100 Breaststroke | LCM | 1:34.20 | B+1.21s to BB·+13.61s to Sectionals | 2024-07-13 | 2024 FL Summer Age Group Championshipsvenue |
| 50 Butterfly | LCM | 38.76 | B+1.77s to BB·+7.47s to Sectionals | 2024-06-09 | 2024 TAMPA BAY SWIM CLASSICvenue |
| 200 Individual Medley | LCM | 2:59.22 | BB+12.53s to A·+27.83s to Sectionals | 2024-06-08 | 2024 TAMPA BAY SWIM CLASSICvenue |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 15.
National cuts (Sectionals → Nationals) are the current-season meet qualifying times for the swimmer's zone and age group; ✓ marks the hardest cut already achieved.
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 | 27.19 | flying | 200 Free Relay (leg 4) | 2025-03-02 | 2025 Spring Area 3 Championships |
| 50 Freestyle | SCY | 28.93 | flying | 200 Medley Relay (leg 4) | 2024-02-24 | 2024 Spring Area 3 Championships |
| 100 Freestyle | SCY | 1:03.64 | flying | 400 Free Relay (leg 2) | 2025-10-11 | WFLA Halloween Invitational |
| 50 Backstroke | SCY | 31.91 | flat | 200 Medley Relay | 2024-10-27 | 2024 GTSA TYR Swim Classic at Berkeley |
| 50 Breaststroke | SCY | 36.96 | flying | 200 Medley Relay (leg 2) | 2024-02-29 | 2024 Florida Swimming FLAGS NORTH |
| 100 Breaststroke | SCY | 1:08.21 | flying | 400 Medley Relay (leg 2) | 2024-03-02 | 2024 Florida Swimming FLAGS NORTH |
| 50 Freestyle | LCM | 31.71 | flat | 200 Free Relay | 2024-07-12 | 2024 FL Summer Age Group Championships |
| 100 Freestyle | LCM | 1:10.30 | flying | 400 Free Relay (leg 2) | 2024-07-13 | 2024 FL Summer Age Group Championships |
| 50 Backstroke | LCM | 36.29 | flat | 200 Medley Relay | 2024-07-11 | 2024 FL Summer Age Group Championships |
| 100 Backstroke | LCM | 1:22.52 | flat | 400 Medley Relay | 2024-07-12 | 2024 FL Summer Age Group Championships |
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 15-16 · SCY
1541 points (3/6 events — incomplete)
| Event | Time | Points |
|---|---|---|
| 200 BK SCY | 2:32.08 | 512 |
| 200 BR SCY | 2:59.67 | 467 |
| 200 IM SCY | 2:30.93 | 562 |
| 500 FR SCY | — | 0 |
| 200 FL SCY | — | 0 |
| 400 IM SCY | — | 0 |
IMR 15-16 · SCY
2068 points (4/5 events — incomplete)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 2:21.25 | 495 |
| 100 BK SCY | 1:10.02 | 514 |
| 100 BR SCY | 1:21.41 | 497 |
| 200 IM SCY | 2:30.93 | 562 |
| 100 FL SCY | — | 0 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
100 Freestyle SCY 1:01.36
Front half 29.33s · back half 32.03s
200 Freestyle SCY 2:21.25
Front half 68.46s · back half 72.79s
100 Backstroke SCY 1:10.02
Front half 33.86s · back half 36.16s
200 Backstroke SCY 2:32.08
Front half 73.40s · back half 78.68s
100 Breaststroke SCY 1:21.41
Front half 37.74s · back half 43.67s
200 Breaststroke SCY 2:59.67
Front half 85.08s · back half 94.59s
100 Individual Medley SCY 1:11.71
Front half 32.94s · back half 38.77s
200 Individual Medley SCY 2:30.93
Front half 71.74s · back half 79.19s
100 Freestyle LCM 1:14.10
Front half 34.78s · back half 39.32s
200 Freestyle LCM 2:41.91
Front half 78.62s · back half 83.29s
400 Freestyle LCM 5:29.97
Front half 166.10s · back half 163.87s
100 Backstroke LCM 1:20.01
Front half 36.57s · back half 43.44s
100 Breaststroke LCM 1:34.20 RT 0.74s
Front half 42.91s · back half 51.29s
200 Individual Medley LCM 2:59.22
Front half 89.50s · back half 89.72s
Reaction time
From electronically-timed starts only (~2% of corpus swims carry a reaction time). PRs with a recorded reaction show an RT chip in the splits section above.
Swim history
Every recorded swim, newest first
| Date | Event | Course | Time | Age | Round | Meet |
|---|
Individual swims with a recorded date and time — including disqualifications — plus reconstructed relay legs (marked). Assembled in the browser from this page’s data.
Progression
Faster times are higher. One card per event, all courses & history.