Jonny Marshall

Personal Bests

Best times from available individual swims and official relay lead-offs. Career coverage may be incomplete. Select an event to show its progression.

50 Freestyle

2023 Speedo Junior National Championships — Swimming · San Antonio, TX · Meet 31 Jul–4 Aug 2023

—23.88

2023 Speedo Junior National Championships — Swimming · San Antonio, TX · Meet 31 Jul–4 Aug 2023

—51.51

200 Freestyle

2023 Speedo Junior National Championships — Swimming · San Antonio, TX · Meet 31 Jul–4 Aug 2023

—1:52.55

2024 TYR Pro Swim Series - Knoxville · Westmont, United States of America · Meet 10–13 Jan 2024

—54.36

2023 Speedo Junior National Championships — Swimming · San Antonio, TX · Meet 31 Jul–4 Aug 2023

—2:00.79

100 Butterfly

2021 Speedo Summer Championships — East · Greensboro, NC · Meet 3–7 Aug 2021

—57.95

All Results 46 swims · 9 meets

Meet dates describe the competition. Race dates are shown per swim where available.

2026 NCAA Division I Men's Swimming & Diving · Meet 25–28 Mar 2026

100y Backstroke SCY25 Mar 2026

25 Mar 2026Preliminary1744.90

200y Backstroke SCY25 Mar 2026

25 Mar 2026Championship Final21:37.15

200y Backstroke SCY25 Mar 2026

25 Mar 2026Preliminary61:38.08

2025 NCAA Division I Men's Swimming & Diving · Meet 26–29 Mar 2025

100y Backstroke SCY26 Mar 2025

26 Mar 2025Championship Final243.22

100y Backstroke SCY26 Mar 2025

26 Mar 2025Preliminary143.88

200y Backstroke SCY26 Mar 2025

26 Mar 2025Championship Final51:37.00

200y Backstroke SCY26 Mar 2025

26 Mar 2025Preliminary81:38.07

2024 NCAA Division I Men's Swimming & Diving Championships · Meet 27–30 Mar 2024

100y Backstroke SCY27 Mar 2024

27 Mar 2024Preliminary844.52

100y Backstroke SCY27 Mar 2024

27 Mar 2024Championship Final844.86

200y Backstroke SCY27 Mar 2024

27 Mar 2024Championship Final41:37.04

200y Backstroke SCY27 Mar 2024

27 Mar 2024Preliminary41:37.84

2024 TYR Pro Swim Series - Knoxville · Westmont, United States of America · Meet 10–13 Jan 2024

100 Freestyle LCM

—Heat7352.64

100 Backstroke LCM

—Final354.36

100 Backstroke LCM

—Heat354.63

200 Backstroke LCM

—Final62:01.33

200 Backstroke LCM

—Heat82:03.09

2023 Speedo Junior National Championships — Swimming · San Antonio, TX · Meet 31 Jul–4 Aug 2023

50 Freestyle LCM

—Heat6423.88

100 Freestyle LCM

—Heat3151.51

100 Backstroke LCM

—Final154.59

100 Backstroke LCM

—Heat155.25

200 Freestyle LCM

—Heat201:52.55

200 Backstroke LCM

—Heat22:00.79

200 Backstroke LCM

—Final62:02.34

2022 East Speedo Winter Junior Championships · Meet 7–10 Dec 2022

50 Freestyle SCY

—Heat9421.16

100 Backstroke SCY

—Final646.46

100 Backstroke SCY

—Heat546.66

200 Freestyle SCY

—Heat121:37.71

200 Freestyle SCY

—Consolation Final61:38.32

200 Backstroke SCY

—Final41:42.52

200 Backstroke SCY

—Heat31:42.70

200 IM SCY

—Heat441:50.70

2021 East Speedo Winter Junior Championships · Meet 8–11 Dec 2021

100 Freestyle SCY

—Heat7446.30

100 Backstroke SCY

—Final246.87

100 Backstroke SCY

—Heat447.41

100 Butterfly SCY

—Bonus Final348.55

100 Butterfly SCY

—Heat2248.56

200 Backstroke SCY

—Final21:41.99

200 Backstroke SCY

—Heat81:44.51

200 IM SCY

—Heat321:50.45

2021 Speedo Summer Championships — East · Greensboro, NC · Meet 3–7 Aug 2021

100 Backstroke LCM

—Heat355.30

100 Backstroke LCM

—Final355.33

100 Butterfly LCM

—Heat6257.95

200 Backstroke LCM

—Final42:02.34

200 Backstroke LCM

—Heat62:03.55

2019 East Speedo Winter Juniors · Meet 11–14 Dec 2019

100 Backstroke SCY

—Heat4750.17

200 Backstroke SCY

—Heat281:47.99