Boston Marathon logo
BOSTON MARATHON 2023

Jin-Sae Ro

Bib: 626•M

MI

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 0.7%
Gender (Male)
#0 / 15176
Top 1%
Division (M18-39)
#0 / 5285
Top 3%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
17:56
Rank: #357
Start → 5K
17:56 | 5:46/mi
10K· 6.21 mi
35:28
Rank: #309 (+48)
5K → 10K
17:32 | 5:39/mi
15K· 9.32 mi
53:08
Rank: #276 (+33)
10K → 15K
17:40 | 5:41/mi
20K· 12.43 mi
1:11:04
Rank: #274 (+2)
15K → 20K
17:56 | 5:46/mi
Half· 13.11 mi
1:14:57
Rank: #274
20K → Half
3:53 | 5:42/mi
25K· 15.53 mi
1:28:54
Rank: #267 (+7)
Half → 25K
13:57 | 5:45/mi
30K· 18.64 mi
1:47:12
Rank: #258 (+9)
25K → 30K
18:18 | 5:53/mi
20M
1:55:10
Rank: #249 (+9)
30K → 20M
7:58 | 5:52/mi
21M
2:01:15
Rank: #231 (+18)
20M → 21M
6:05 | 6:05/mi
35K· 21.75 mi
2:05:30
Rank: #226 (+5)
21M → 35K
4:15 | 5:41/mi
23M
2:12:48
Rank: #217 (+9)
35K → 23M
7:18 | 5:50/mi
24M
2:18:36
Rank: #217
23M → 24M
5:48 | 5:48/mi
40K· 24.85 mi
2:23:39
Rank: #207 (+10)
24M → 40K
5:03 | 5:54/mi
25.2M
2:25:51
Rank: #206 (+1)
40K → 25.2M
2:12 | 6:23/mi
Finish· 26.22 mi
2:31:41
Rank: #196 (+10)
25.2M → Finish
5:50 | 5:43/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:14:57
Pace5:43 /mi
2nd Half
Distance13.11 mi
Time1:16:44
Pace5:51 /mi
📊Positive Split: 2.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:18:0817:565:4617:56
5:46
-
10K
6.21 mi10:35:4035:285:4217:32
5:39
-0:07
15K
9.32 mi10:53:2053:085:4217:40
5:41
+0:02
20K
12.43 mi11:11:161:11:045:4317:56
5:46
+0:05
Half
13.11 mi11:15:091:14:575:433:53
5:42
-0:04
25K
15.53 mi11:29:061:28:545:4313:57
5:45
+0:03
30K
18.64 mi11:47:241:47:125:4518:18
5:53
+0:08
20M
20.00 mi11:55:221:55:105:457:58
5:52
-0:01
21M
21.00 mi12:01:272:01:155:466:05
6:05
+0:13
35K
21.75 mi12:05:422:05:305:464:15
5:41
-0:24
23M
23.00 mi12:13:002:12:485:467:18
5:50
+0:09
24M
24.00 mi12:18:482:18:365:475:48
5:48
-0:02
40K
24.85 mi12:23:512:23:395:475:03
5:54
+0:06
25.2M
25.20 mi12:26:032:25:515:472:12
6:23
+0:29
Finish
26.22 mi12:31:532:31:415:475:50
5:43
-0:40

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

5:39 /mi

Average Pace

5:47 /mi

Slowest Pace

6:23 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:29:29

99% of race

Time at Steady Pace

2:12

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 5:47 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:18:0817:565:4617:56
5:46
#357
10K
6.21 mi10:35:4035:285:4217:32
5:39
#309
15K
9.32 mi10:53:2053:085:4217:40
5:41
#276
20K
12.43 mi11:11:161:11:045:4317:56
5:46
#274
Half
13.11 mi11:15:091:14:575:433:53
5:42
#274
25K
15.53 mi11:29:061:28:545:4313:57
5:45
#267
30K
18.64 mi11:47:241:47:125:4518:18
5:53
#258
20M
20.00 mi11:55:221:55:105:457:58
5:52
#249
21M
21.00 mi12:01:272:01:155:466:05
6:05
#231
35K
21.75 mi12:05:422:05:305:464:15
5:41
#226
23M
23.00 mi12:13:002:12:485:467:18
5:50
#217
24M
24.00 mi12:18:482:18:365:475:48
5:48
#217
40K
24.85 mi12:23:512:23:395:475:03
5:54
#207
25.2M
25.20 mi12:26:032:25:515:472:12
6:23
#206
Finish
26.22 mi12:31:532:31:415:475:50
5:43
#196
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi357323323227(Top 0.9%)199(Top 1%)199(Top 4%)
10K6.21 mi3.10 mi309+48279+44279+44238(Top 0.9%)210(Top 1%)210(Top 4%)
15K9.32 mi3.11 mi276+33248+31248+31227(Top 0.9%)199(Top 1%)199(Top 4%)
20K12.43 mi3.11 mi274+2246+2246+2261(Top 1.0%)233(Top 2%)233(Top 4%)
Half13.11 mi0.68 mi274246246261(Top 1.0%)239(Top 2%)239(Top 5%)
25K15.53 mi2.42 mi267+7239+7239+7218(Top 0.8%)195(Top 1%)195(Top 4%)
30K18.64 mi3.11 mi258+9231+8231+8240(Top 0.9%)216(Top 1%)216(Top 4%)
20M20.00 mi1.36 mi249+9224+7224+7213(Top 0.8%)191(Top 1%)191(Top 4%)
21M21.00 mi1.00 mi231+18206+18206+18153(Top 0.6%)133(Top 0.9%)133(Top 3%)
35K21.75 mi0.75 mi226+5201+5201+5199(Top 0.7%)176(Top 1%)176(Top 3%)
23M23.00 mi1.25 mi217+9193+8193+8151(Top 0.6%)130(Top 0.9%)130(Top 2%)
24M24.00 mi1.00 mi217193193241(Top 0.9%)217(Top 1%)217(Top 4%)
40K24.85 mi0.85 mi207+10182+11182+11221(Top 0.8%)198(Top 1%)198(Top 4%)
25.2M25.20 mi0.35 mi206+1181+1181+1298(Top 1%)277(Top 2%)277(Top 5%)
Finish26.22 mi1.02 mi196+10171+10171+10261(Top 1.0%)244(Top 2%)244(Top 5%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 0.9%
×21stories
+97ft-345ft

Overall

227

Males

199

M18-39

199

5K→10K

3.1 - 6.2 mi

Top 0.9%
×5stories
+79ft-138ft

Overall

238

Males

210

M18-39

210

10K→15K

6.2 - 9.3 mi

Top 0.9%
×3stories
+67ft-78ft

Overall

227

Males

199

M18-39

199

15K→20K

9.3 - 12.4 mi

Top 1.0%
×5stories
+106ft-86ft

Overall

261

Males

233

M18-39

233

20K→Half

12.4 - 13.1 mi

Top 1.0%
×2stories
+19ft-37ft

Overall

261

Males

239

M18-39

239

Half→25K

13.1 - 15.5 mi

Top 0.8%
×4stories
+66ft-88ft

Overall

218

Males

195

M18-39

195

25K→30K

15.5 - 18.6 mi

Top 0.9%
×9stories
+181ft-148ft

Overall

240

Males

216

M18-39

216

30K→20M

18.6 - 20.0 mi

Top 0.8%
×5stories
+64ft-50ft

Overall

213

Males

191

M18-39

191

20M→21M

20.0 - 21.0 mi

Top 0.6%
×8stories
+106ft-24ft

Overall

153

Males

133

M18-39

133

21M→35K

21.0 - 21.8 mi

Top 0.7%
×7stories
+17ft-86ft

Overall

199

Males

176

M18-39

176

35K→23M

21.8 - 23.0 mi

Top 0.6%
×5stories
+23ft-63ft

Overall

151

Males

130

M18-39

130

23M→24M

23.0 - 24.0 mi

Top 0.9%
×6stories
+12ft-82ft

Overall

241

Males

217

M18-39

217

24M→40K

24.0 - 24.9 mi

Top 0.8%
×1story
+6ft-20ft

Overall

221

Males

198

M18-39

198

40K→25.2M

24.9 - 25.2 mi

Top 1%
×1story
+13ft-16ft

Overall

298

Males

277

M18-39

277

25.2M→Finish

25.2 - 26.2 mi

Top 1.0%
×2stories
+22ft-21ft

Overall

261

Males

244

M18-39

244

Passing Analysis

Category:
Athletes Passed
199
Passed By
38
Net Change
+161
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#357
5K → 10K491+48#357#309
10K → 15K341+33#309#276
15K → 20K97+2#276#274
20K → Half220#274#274
Half → 25K125+7#274#267
25K → 30K189+9#267#258
30K → 20M90+9#258#249
20M → 21M191+18#249#231
21M → 35K72+5#231#226
35K → 23M123+9#226#217
23M → 24M220#217#217
24M → 40K122+10#217#207
40K → 25.2M32+1#207#206
25.2M → Finish111+10#206#196
TOTALS19938+161
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing