Sebastian Alfonso

Age: 10 years old
Age Category: 10 & under
Team: Walnut Creek Aquabears | Pacific Swimming

Personal Best

Short course distance

Event	Time		Age	Date	Standard	Next Standard	Walnut Creek Aquabears	Pacific Swimming	Western Zone	USA
Free 50 Y	35.08		10	03/28/2026	B	BB: 34.59 (+0.49s \| 1.4%)	5	162	727	1,000+

Free 100 Y	1:20.46	Analysis	10	03/28/2026	B	BB: 1:18.89 (+1.57s \| 2.0%)	5	157	716	1,000+

Back 50 Y	45.91		10	03/28/2026	B	BB: 42.89 (+3.02s \| 6.6%)	7	263	1,000+	1,000+

Back 100 Y	1:50.17	Analysis	10	09/27/2025		B: 1:40.69 (+9.48s \| 8.6%)	6	282	1,000+	1,000+

Breast 50 Y	57.74		10	03/28/2026		B: 53.39 (+4.35s \| 7.5%)	8	505	1,000+	1,000+

Fly 50 Y	48.16		10	03/28/2026		B: 46.49 (+1.67s \| 3.5%)	5	260	940	1,000+

IM 100 Y	1:36.81	Analysis	10	03/28/2026	B	BB: 1:29.69 (+7.12s \| 7.4%)	5	224	833	1,000+

Long course distance

Event	Time		Age	Date	Standard	Next Standard	Walnut Creek Aquabears	Pacific Swimming	Western Zone	USA
Free 50 M	37.56		10	06/27/2026	BB	A: 35.69 (+1.87s \| 5.0%)	3	87	354	1,000+

Free 100 M	1:24.33	Analysis	10	06/27/2026	BB	A: 1:20.19 (+4.14s \| 4.9%)	3	82	320	944

Free 200 M	3:11.19	Analysis	10	06/27/2026	BB	A: 2:53.39 (+17.80s \| 9.3%)	2	92	359	1,000+

Back 50 M	45.35		10	06/13/2026	BB	A: 43.09 (+2.26s \| 5.0%)	3	65	360	1,000+

Breast 50 M	59.45		10	06/13/2026	B	BB: 54.39 (+5.06s \| 8.5%)	5	244	923	1,000+

Fly 50 M	47.29		10	06/13/2026	B	BB: 46.39 (+0.90s \| 1.9%)	3	113	462	1,000+

Above are the fastest times that Sebastian Alfonso has achieved in his swimming career. For each event, you can find Sebastian's best time, the corresponding time standard, as well as how much faster Sebastian needs to be to reach the next level. The last columns provide Sebastian rankings at the team and LSC levels. These rankings are based on the Sebastian's personal best, his current age category, and team; and are calculated from all the meets results.

Time Standards

Got the currrent age group time standard
Time standard for the next age group and the gap to reach it
Got the next age group’s time standard.

Short Course Distance

Event	Best Time	Age Group Championship	Far Western	Senior Open	Senior 2	Western Zone Sr.	Sectionals	18U Spring Cup	Futures	Jrs - Winter	US Open	Summer Champ	NATIONAL	SouthWestern Age Group Regional
Free 50 Y	35.08	30.99 (+4.09s \| 11.7%)	30.19 (+4.89s \| 13.9%)	26.89 (+8.19s \| 23.3%)	24.79 (+10.29s \| 29.3%)	23.29 (+11.79s \| 33.6%)	22.19 (+12.89s \| 36.7%)	21.29 (+13.79s \| 39.3%)	21.29 (+13.79s \| 39.3%)	20.59 (+14.49s \| 41.3%)	20.09 (+14.99s \| 42.7%)	20.39 (+14.69s \| 41.9%)	N/A	30.49 (+4.59s \| 13.1%)
Free 100 Y	1:20.46	1:09.69 (+10.77s \| 13.4%)	1:07.59 (+12.87s \| 16.0%)	58.69 (+21.77s \| 27.1%)	54.19 (+26.27s \| 32.6%)	51.19 (+29.27s \| 36.4%)	48.19 (+32.27s \| 40.1%)	46.39 (+34.07s \| 42.3%)	46.39 (+34.07s \| 42.3%)	45.09 (+35.37s \| 44.0%)	43.49 (+36.97s \| 45.9%)	44.39 (+36.07s \| 44.8%)	N/A	1:07.19 (+13.27s \| 16.5%)
Back 50 Y	45.91	36.99 (+8.92s \| 19.4%)	35.79 (+10.12s \| 22.0%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	36.29 (+9.62s \| 21.0%)
Back 100 Y	1:50.17	1:18.89 (+31.28s \| 28.4%)	1:17.09 (+33.08s \| 30.0%)	1:04.69 (+45.48s \| 41.3%)	59.79 (+50.38s \| 45.7%)	55.99 (+54.18s \| 49.2%)	53.89 (+56.28s \| 51.1%)	51.49 (+58.68s \| 53.3%)	51.49 (+58.68s \| 53.3%)	49.39 (+60.78s \| 55.2%)	47.59 (+62.58s \| 56.8%)	48.89 (+61.28s \| 55.6%)	N/A	1:16.59 (+33.58s \| 30.5%)
Breast 50 Y	57.74	40.99 (+16.75s \| 29.0%)	39.99 (+17.75s \| 30.7%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	40.29 (+17.45s \| 30.2%)
Fly 50 Y	48.16	35.39 (+12.77s \| 26.5%)	33.99 (+14.17s \| 29.4%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	34.69 (+13.47s \| 28.0%)
IM 100 Y	1:36.81	1:18.89 (+17.92s \| 18.5%)	1:16.89 (+19.92s \| 20.6%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	1:16.99 (+19.82s \| 20.5%)

Long Course Distance

Event	Best Time	Age Group Championship	Far Western	Senior Open	Senior 2	Western Zone Sr.	Sectionals	18U Spring Cup	Futures	Jrs - Winter	US Open	Summer Champ	NATIONAL	U.S Olympic Team Trials	SouthWestern Age Group Regional
Free 50 M	37.56	35.49 (+2.07s \| 5.5%)	34.39 (+3.17s \| 8.4%)	30.19 (+7.37s \| 19.6%)	27.89 (+9.67s \| 25.7%)	26.79 (+10.77s \| 28.7%)	25.89 (+11.67s \| 31.1%)	24.59 (+12.97s \| 34.5%)	24.59 (+12.97s \| 34.5%)	24.29 (+13.27s \| 35.3%)	23.39 (+14.17s \| 37.7%)	23.79 (+13.77s \| 36.7%)	N/A	22.79 (+14.77s \| 39.3%)	34.59 (+2.97s \| 7.9%)
Free 100 M	1:24.33	1:19.49 (+4.84s \| 5.7%)	1:17.09 (+7.24s \| 8.6%)	1:07.39 (+16.94s \| 20.1%)	1:02.19 (+22.14s \| 26.3%)	59.19 (+25.14s \| 29.8%)	56.09 (+28.24s \| 33.5%)	53.59 (+30.74s \| 36.5%)	53.59 (+30.74s \| 36.5%)	52.59 (+31.74s \| 37.6%)	50.99 (+33.34s \| 39.5%)	51.99 (+32.34s \| 38.3%)	N/A	49.99 (+34.34s \| 40.7%)	1:16.89 (+7.44s \| 8.8%)
Free 200 M	3:11.19	2:49.89 (+21.30s \| 11.1%)	2:46.39 (+24.80s \| 13.0%)	2:27.89 (+43.30s \| 22.6%)	2:16.49 (+54.70s \| 28.6%)	2:09.29 (+61.90s \| 32.4%)	2:03.09 (+68.10s \| 35.6%)	1:57.79 (+73.40s \| 38.4%)	1:57.79 (+73.40s \| 38.4%)	1:55.49 (+75.70s \| 39.6%)	1:52.19 (+79.00s \| 41.3%)	1:54.09 (+77.10s \| 40.3%)	N/A	1:49.99 (+81.20s \| 42.5%)	2:44.69 (+26.50s \| 13.9%)
Back 50 M	45.35	42.99 (+2.36s \| 5.2%)	40.79 (+4.56s \| 10.1%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	41.59 (+3.76s \| 8.3%)
Breast 50 M	59.45	46.99 (+12.46s \| 21.0%)	45.59 (+13.86s \| 23.3%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	46.29 (+13.16s \| 22.1%)
Fly 50 M	47.29	40.19 (+7.10s \| 15.0%)	38.49 (+8.80s \| 18.6%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	39.19 (+8.10s \| 17.1%)

Progression

See how Sebastian Alfonso is improving gradually by choosing the distance and the stroke you are interested in. You can also compare the Sebastian's time to another swimmer's and even view their profile for more information about them.

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Meets

See all the meets Sebastian Alfonso has participated in and his achievement. The last event displayed is the most recent. For each event, you can find the Sebastian's time, the progress against Sebastian's best time, the corresponding time standard, as well as how much faster Sebastian needs to be to reach the next level.

Event	Time	Progress	Standard	Next Standard	Age	Heat	Lane	Ranking
NVST Summer Plunge 2026			06/27/2026		Napa
50 M Back	47.99	+2.64s	BB	A: 43.09 (+4.90s \| 10.2%)	10	2	7	3

50 M Fly	49.19	+1.90s	B	BB: 46.39 (+2.80s \| 5.7%)	10	1	7	4

50 M Free	37.56	-0.95s (New PB)	BB	A: 35.69 (+1.87s \| 5.0%)	10	3	7	6

100 M Free	1:24.33	-4.17s (New PB)	BB	A: 1:20.19 (+4.14s \| 4.9%)	10	2	4	6

50 M Breast	1:01.97	+2.52s		B: 1:00.89 (+1.08s \| 1.7%)	10	2	3	1

200 M Free	3:11.19		BB	A: 2:53.39 (+17.80s \| 9.3%)	10	1	7	9

Orinda PC LC AG C B BB+			06/13/2026		Moraga
50 M Breast	59.45		B	BB: 54.39 (+5.06s \| 8.5%)	10	3	6	5

50 M Back	45.35		BB	A: 43.09 (+2.26s \| 5.0%)	10	3	2	1

50 M Fly	47.29		B	BB: 46.39 (+0.90s \| 1.9%)	10	3	5	1

50 M Free	38.51		BB	A: 35.69 (+2.82s \| 7.3%)	10	3	6	2

100 M Free	1:28.50		BB	A: 1:20.19 (+8.31s \| 9.4%)	10	2	6	1

Piedmont Swim Team C B BB+			03/28/2026		Oakland
100 Y IM	1:36.81	-19.73s (New PB)	B	BB: 1:29.69 (+7.12s \| 7.4%)	10	2	3	1

100 Y Free	1:20.46	-9.37s (New PB)	B	BB: 1:18.89 (+1.57s \| 2.0%)	10	1	1	4

50 Y Fly	48.16			B: 46.49 (+1.67s \| 3.5%)	10	2	8	4

50 Y Free	35.08	-2.56s (New PB)	B	BB: 34.59 (+0.49s \| 1.4%)	10	2	6	2

50 Y Breast	57.74			B: 53.39 (+4.35s \| 7.5%)	10	2	2	4

50 Y Back	45.91		B	BB: 42.89 (+3.02s \| 6.6%)	10	2	5	5

Orinda Aquatics SC C B BB+ Meet			09/27/2025		Moraga
50 Y Free	37.64	-2.67s (New PB)	B	BB: 34.59 (+3.05s \| 8.1%)	9	5	1	3

100 Y IM	1:56.54			B: 1:39.69 (+16.85s \| 14.5%)	9	8	2	4

100 Y Free	1:29.83			B: 1:27.99 (+1.84s \| 2.0%)	9	5	2	3

100 Y Back	1:50.17			B: 1:40.69 (+9.48s \| 8.6%)	9	3	7	8

Zone 2 Summer Championships			07/26/2025		Hayward
50 Y Free	40.31	-6.55s (New PB)		B: 38.19 (+2.12s \| 5.3%)	9

DA WCAB Short Course Dual Meet			03/23/2025		Walnut Creek
50 Y Free	46.86			B: 38.19 (+8.67s \| 18.5%)	9	9	2	9

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.