William Seo

Age: 9 years old
Age Category: 10 & under
Team: Bethesda-Chevy Chase YMCA | Potomac Valley Swimming

Personal Best

Short course distance

Event

Time

Age

Date

Standard

Next Standard

Bethesda-Chevy Chase YMCA

Potomac Valley Swimming

Eastern Zone

USA

Free 50 Y

38.12

01/10/2026

BB: 34.59 (+3.53s | 9.3%)

482

1,000+

Free 100 Y

1:29.98

02/07/2026

B: 1:27.99 (+1.99s | 2.2%)

502

1,000+

50 Free

43.00

100 Free

46.98

1:29.98

100 Free

1:29.98

Free 200 Y

3:13.45

01/10/2026

B: 3:09.49 (+3.96s | 2.0%)

267

1,000+

50 Free

44.25

100 Free

50.23

1:34.48

100 Free

1:34.48

150 Free

51.57

2:26.05

200 Free

47.40

3:13.45

100 Free

1:38.97

Free 500 Y

8:40.09

11/01/2025

B: 8:24.29 (+15.80s | 3.0%)

102

511

1,000+

50 Free

39.75

100 Free

49.69

1:29.44

100 Free

1:29.44

150 Free

52.64

2:22.08

200 Free

54.40

3:16.48

100 Free

1:47.04

250 Free

55.02

4:11.50

300 Free

53.62

5:05.12

100 Free

1:48.64

350 Free

55.88

6:01.00

400 Free

56.08

6:57.08

100 Free

1:51.96

450 Free

53.60

7:50.68

500 Free

49.41

8:40.09

100 Free

1:43.01

Back 50 Y

44.46

12/21/2025

BB: 42.89 (+1.57s | 3.5%)

392

1,000+

Back 100 Y

1:39.79

02/07/2026

BB: 1:30.09 (+9.70s | 9.7%)

320

1,000+

50 Back

49.01

100 Back

50.78

1:39.79

100 Back

1:39.79

Breast 50 Y

53.61

11/14/2025

B: 53.39 (+0.22s | 0.4%)

515

1,000+

Breast 100 Y

1:57.89

10/10/2025

B: 1:54.09 (+3.80s | 3.2%)

391

1,000+

50 Breast

55.08

100 Breast

1:02.81

1:57.89

100 Breast

1:57.89

Fly 50 Y

47.77

12/05/2025

B: 46.49 (+1.28s | 2.7%)

447

1,000+

IM 100 Y

1:36.91

02/07/2026

BB: 1:29.69 (+7.22s | 7.5%)

356

1,000+

50 IM

46.58

100 IM

50.33

1:36.91

100 IM

1:36.91

Long course distance

Event	Time		Age	Date	Standard	Next Standard	Bethesda-Chevy Chase YMCA	Potomac Valley Swimming	Eastern Zone	USA

Above are the fastest times that William Seo has achieved in his swimming career. For each event, you can find William's best time, the corresponding time standard, as well as how much faster William needs to be to reach the next level. The last columns provide William rankings at the team and LSC levels. These rankings are based on the William'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	Sectionals	18U Spring Cup	Futures	Jrs - Winter	US Open	Summer Champ	SouthWestern Age Group Regional
Free 50 Y	38.12	22.19 (+15.93s \| 41.8%)	21.29 (+16.83s \| 44.2%)	21.29 (+16.83s \| 44.2%)	20.59 (+17.53s \| 46.0%)	20.09 (+18.03s \| 47.3%)	20.39 (+17.73s \| 46.5%)	30.49 (+7.63s \| 20.0%)
Free 100 Y	1:29.98	48.19 (+41.79s \| 46.4%)	46.39 (+43.59s \| 48.4%)	46.39 (+43.59s \| 48.4%)	45.09 (+44.89s \| 49.9%)	43.49 (+46.49s \| 51.7%)	44.39 (+45.59s \| 50.7%)	1:07.19 (+22.79s \| 25.3%)
Free 200 Y	3:13.45	1:45.79 (+87.66s \| 45.3%)	1:41.59 (+91.86s \| 47.5%)	1:41.59 (+91.86s \| 47.5%)	1:38.79 (+94.66s \| 48.9%)	1:36.49 (+96.96s \| 50.1%)	1:38.09 (+95.36s \| 49.3%)	2:24.99 (+48.46s \| 25.1%)
Free 500 Y	8:40.09	4:47.79 (+232.30s \| 44.7%)	4:37.09 (+243.00s \| 46.7%)	4:37.09 (+243.00s \| 46.7%)	4:29.49 (+250.60s \| 48.2%)	4:22.09 (+258.00s \| 49.6%)	4:27.69 (+252.40s \| 48.5%)	6:25.49 (+134.60s \| 25.9%)
Back 50 Y	44.46	N/A	N/A	N/A	N/A	N/A	N/A	36.29 (+8.17s \| 18.4%)
Back 100 Y	1:39.79	53.89 (+45.90s \| 46.0%)	51.49 (+48.30s \| 48.4%)	51.49 (+48.30s \| 48.4%)	49.39 (+50.40s \| 50.5%)	47.59 (+52.20s \| 52.3%)	48.89 (+50.90s \| 51.0%)	1:16.59 (+23.20s \| 23.2%)
Breast 50 Y	53.61	N/A	N/A	N/A	N/A	N/A	N/A	40.29 (+13.32s \| 24.8%)
Breast 100 Y	1:57.89	1:00.89 (+57.00s \| 48.4%)	57.99 (+59.90s \| 50.8%)	57.99 (+59.90s \| 50.8%)	55.89 (+62.00s \| 52.6%)	54.19 (+63.70s \| 54.0%)	55.29 (+62.60s \| 53.1%)	1:26.29 (+31.60s \| 26.8%)
Fly 50 Y	47.77	N/A	N/A	N/A	N/A	N/A	N/A	34.69 (+13.08s \| 27.4%)
IM 100 Y	1:36.91	N/A	N/A	N/A	N/A	N/A	N/A	1:16.99 (+19.92s \| 20.6%)

Long Course Distance

Event	Best Time	Sectionals	18U Spring Cup	Futures	Jrs - Winter	US Open	Summer Champ	SouthWestern Age Group Regional

Progression

See how William Seo is improving gradually by choosing the distance and the stroke you are interested in. You can also compare the William'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 William Seo has participated in and his achievement. The last event displayed is the most recent. For each event, you can find the William's time, the progress against William's best time, the corresponding time standard, as well as how much faster William needs to be to reach the next level.

Event

Time

Progress

Standard

Next Standard

Age

Heat

Lane

Ranking

2026 MAKO QUALIFIER

02/07/2026

FAIRFAX

50 Y Back

46.26

+1.80s

BB: 42.89 (+3.37s | 7.3%)

50 Y Breast

54.06

+0.45s

B: 53.39 (+0.67s | 1.2%)

100 Y Back

1:39.79

-1.21s (New PB)

BB: 1:30.09 (+9.70s | 9.7%)

50 Back

49.01

100 Back

50.78

1:39.79

100 Back

1:39.79

100 Y IM

1:36.91

-0.27s (New PB)

BB: 1:29.69 (+7.22s | 7.5%)

50 IM

46.58

100 IM

50.33

1:36.91

100 IM

1:36.91

50 Y Free

41.26

+3.14s

B: 38.19 (+3.07s | 7.4%)

100 Y Free

1:29.98

-2.72s (New PB)

B: 1:27.99 (+1.99s | 2.2%)

50 Free

43.00

100 Free

46.98

1:29.98

100 Free

1:29.98

2026 MAKO POLAR PLUNGE

01/10/2026

FAIRFAX

50 Y Free

38.12

-0.99s (New PB)

BB: 34.59 (+3.53s | 9.3%)

50 Y Back

44.86

+0.40s

BB: 42.89 (+1.97s | 4.4%)

200 Y Free

3:13.45

B: 3:09.49 (+3.96s | 2.0%)

50 Free

44.25

100 Free

50.23

1:34.48

100 Free

1:34.48

150 Free

51.57

2:26.05

200 Free

47.40

3:13.45

100 Free

1:38.97

50 Y Fly

52.37

+4.60s

B: 46.49 (+5.88s | 11.2%)

2025 PAC 10 U Reindeer Games

12/21/2025

Laurel

50 Y Free

39.81

+0.70s

B: 38.19 (+1.62s | 4.1%)

50 Y Back

44.46

-1.04s (New PB)

BB: 42.89 (+1.57s | 3.5%)

100 Y Free

1:34.54

+1.84s

B: 1:27.99 (+6.55s | 6.9%)

100 Y IM

1:37.18

-5.57s (New PB)

BB: 1:29.69 (+7.49s | 7.7%)

2025 Christmas Championships

12/05/2025

Laurel

100 Y Back

1:41.00

-1.66s (New PB)

B: 1:40.69 (+0.31s | 0.3%)

50 Back

47.89

100 Back

53.11

1:41.00

100 Back

1:41.00

50 Y Fly

47.77

-4.94s (New PB)

B: 46.49 (+1.28s | 2.7%)

50 Y Free

41.36

+2.25s

B: 38.19 (+3.17s | 7.7%)

2025PV November Open Fairland

11/14/2025

Laurel

100 Y IM

1:42.75

B: 1:39.69 (+3.06s | 3.0%)

50 IM

49.28

100 IM

53.47

1:42.75

100 IM

1:42.75

100 Y Free

1:32.70

B: 1:27.99 (+4.71s | 5.1%)

50 Free

43.41

100 Free

49.29

1:32.70

100 Free

1:32.70

50 Y Breast

53.61

B: 53.39 (+0.22s | 0.4%)

50 Y Fly

52.71

B: 46.49 (+6.22s | 11.8%)

50 Y Back

47.34

+1.84s

BB: 42.89 (+4.45s | 9.4%)

100 Y Back

1:42.66

B: 1:40.69 (+1.97s | 1.9%)

50 Back

50.15

100 Back

52.51

1:42.66

100 Back

1:42.66

2025 DC Wave November Distance Meet

11/01/2025

Washington

500 Y Free

8:40.09

B: 8:24.29 (+15.80s | 3.0%)

50 Free

39.75

100 Free

49.69

1:29.44

100 Free

1:29.44

150 Free

52.64

2:22.08

200 Free

54.40

3:16.48

100 Free

1:47.04

250 Free

55.02

4:11.50

300 Free

53.62

5:05.12

100 Free

1:48.64

350 Free

55.88

6:01.00

400 Free

56.08

6:57.08

100 Free

1:51.96

450 Free

53.60

7:50.68

500 Free

49.41

8:40.09

100 Free

1:43.01

2025 PV October Open Fairland

10/10/2025

Laurel

50 Y Back

45.50

BB: 42.89 (+2.61s | 5.7%)

50 Y Free

39.11

B: 38.19 (+0.92s | 2.4%)

100 Y Breast

1:57.89

B: 1:54.09 (+3.80s | 3.2%)

50 Breast

55.08

100 Breast

1:02.81

1:57.89

100 Breast

1:57.89

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.