MARK O'BRIEN

17 races in the archive

Personal bests

Half Marathon

1:45:51

2015 · 8:04 /mi

10K

47:00

2015 · 7:34 /mi

8K

41:50

2014 · 8:25 /mi

Progression

Half Marathon7 finishes · best 1:45:51 in 2015 · latest 2:07:16 in 2022
1:40:002:13:2020152016201720182019202120222015 2015 American Family Fitness Half Marathon — 1:45:511:45:512016 2016 American Family Fitness Half Marathon — 1:48:352017 2017 Markel Richmond Half Marathon — 1:51:292018 2018 Markel Richmond Half Marathon — 1:50:052019 2019 Markel Richmond Half Marathon — 2:23:542021 2021 Carmax Richmond Half Marathon — 1:50:512022 2022 CarMax Richmond Half Marathon — 2:07:16

Lower on the chart is faster — a line falling to the right means improvement.

10K9 finishes · best 47:00 in 2015 · latest 1:25:53 in 2026
41:401:23:202:05:002015201620172019202120222024202520262015 10K — 47:0047:002016 10K — 47:042017 10K — 47:232019 10K — 50:062021 10K — 53:462022 10K — 54:272024 10K — 2:03:462025 10K — 55:112026 10K — 1:25:53

Lower on the chart is faster — a line falling to the right means improvement.

Half Marathon — pace by segment6 of 7 editions shown
8:2010:00Start–10K10K–Finish2022 · Start to 10K · 9:28 /mi2022 · 10K to Finish · 9:55 /mi20222021 · Start to 10K · 8:46 /mi2021 · 10K to Finish · 8:10 /mi20212019 · Start to 10K · 10:55 /mi2019 · 10K to Finish · 11:01 /mi20192018 · Start to 10K · 9:03 /mi2018 · 10K to Finish · 7:49 /mi20182017 · Start to 10K · 9:01 /mi2017 · 10K to Finish · 8:03 /mi20172016 · Start to 10K · 8:45 /mi2016 · 10K to Finish · 7:52 /mi2016

Minutes per mile over each stretch of the course. Lower is faster, so a line rising to the right means slowing down. Colour runs pale for the earliest editions to dark for the most recent; tap a year to show or hide it.

10K — pace by segment6 of 8 editions shown
8:2016:40Start–5K5K–Finish2026 · Start to 5K · 13:56 /mi2026 · 5K to Finish · 13:43 /mi20262025 · Start to 5K · 8:52 /mi2025 · 5K to Finish · 8:54 /mi20252024 · Start to 5K · 21:33 /mi2024 · 5K to Finish · 18:17 /mi20242022 · Start to 5K · 8:40 /mi2022 · 5K to Finish · 8:51 /mi20222021 · Start to 5K · 9:17 /mi2021 · 5K to Finish · 8:02 /mi20212019 · Start to 5K · 8:20 /mi2019 · 5K to Finish · 7:48 /mi2019

Minutes per mile over each stretch of the course. Lower is faster, so a line rising to the right means slowing down. Colour runs pale for the earliest editions to dark for the most recent; tap a year to show or hide it.

Race history