All Results|Race Analytics|Course|Contact
BOSTON MARATHON 2025

Go Nakagawa

Bib: 452•M

Boston Marathon logo
0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Gender (Male)
#0 / 16105
Age Group (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K· 3.11 mi
26:36
Rank: #20242
Start → 5K
26:36 | 8:34/mi
10K· 6.21 mi
52:18
Rank: #19336 (+906)
5K → 10K
25:42 | 8:16/mi
15K· 9.32 mi
1:18:00
Rank: #18842 (+494)
10K → 15K
25:42 | 8:16/mi
20K· 12.43 mi
1:44:07
Rank: #18499 (+343)
15K → 20K
26:07 | 8:24/mi
Half· 13.11 mi
1:49:44
Rank: #18445 (+54)
20K → Half
5:37 | 8:14/mi
25K· 15.53 mi
2:10:00
Rank: #18049 (+396)
Half → 25K
20:16 | 8:22/mi
30K· 18.64 mi
2:37:52
Rank: #17901 (+148)
25K → 30K
27:52 | 8:58/mi
20M
2:50:30
Rank: #17932 (-31)
30K → 20M
12:38 | 9:18/mi
21M
3:00:40
Rank: #18030 (-98)
20M → 21M
10:10 | 10:10/mi
35K· 21.75 mi
3:07:02
Rank: #17930 (+100)
21M → 35K
6:22 | 8:31/mi
23M
3:18:11
Rank: #17761 (+169)
35K → 23M
11:09 | 8:54/mi
24M
3:27:09
Rank: #17709 (+52)
23M → 24M
8:58 | 8:58/mi
40K· 24.85 mi
3:35:04
Rank: #17717 (-8)
24M → 40K
7:55 | 9:16/mi
25.2M
3:38:34
Rank: #17707 (+10)
40K → 25.2M
3:30 | 10:09/mi
Finish· 26.22 mi
3:48:06
Rank: #17865 (-158)
25.2M → Finish
9:32 | 9:21/mi
Is this your race?

Claim it — get your free Race Performance Report

An AI deep-dive into your pacing, rankings, and passing — built from your real splits and emailed to you, free.

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via Half
Distance13.11 mi
Time1:49:44
Pace8:22 /mi
2nd Half
Distance13.11 mi
Time1:58:22
Pace9:02 /mi
📊Positive Split: 7.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:22:3126:368:3426:36
8:34
-
10K
6.21 mi11:48:1352:188:2525:42
8:16
-0:18
15K
9.32 mi12:13:551:18:008:2225:42
8:16
0:00
20K
12.43 mi12:40:021:44:078:2326:07
8:24
+0:08
Half
13.11 mi12:45:391:49:448:225:37
8:14
-0:10
25K
15.53 mi13:05:552:10:008:2220:16
8:22
+0:08
30K
18.64 mi13:33:472:37:528:2827:52
8:58
+0:36
20M
20.00 mi13:46:252:50:308:3112:38
9:18
+0:20
21M
21.00 mi13:56:353:00:408:3610:10
10:10
+0:52
35K
21.75 mi14:02:573:07:028:366:22
8:31
-1:39
23M
23.00 mi14:14:063:18:118:3711:09
8:54
+0:23
24M
24.00 mi14:23:043:27:098:388:58
8:58
+0:04
40K
24.85 mi14:30:593:35:048:397:55
9:16
+0:18
25.2M
25.20 mi14:34:293:38:348:403:30
10:09
+0:53
Finish
26.22 mi14:44:013:48:068:429:32
9:21
-0:48

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

8:14 /mi

Average Pace

8:42 /mi

Slowest Pace

10:10 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

2:16:22

60% of race

Time at Steady Pace

47:59

21% of race

Time at Slower Pace

43:45

19% of race

Average Pace: 8:42 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:22:3126:368:3426:36
8:34
#20242
10K
6.21 mi11:48:1352:188:2525:42
8:16
#19336
15K
9.32 mi12:13:551:18:008:2225:42
8:16
#18842
20K
12.43 mi12:40:021:44:078:2326:07
8:24
#18499
Half
13.11 mi12:45:391:49:448:225:37
8:14
#18445
25K
15.53 mi13:05:552:10:008:2220:16
8:22
#18049
30K
18.64 mi13:33:472:37:528:2827:52
8:58
#17901
20M
20.00 mi13:46:252:50:308:3112:38
9:18
#17932
21M
21.00 mi13:56:353:00:408:3610:10
10:10
#18030
35K
21.75 mi14:02:573:07:028:366:22
8:31
#17930
23M
23.00 mi14:14:063:18:118:3711:09
8:54
#17761
24M
24.00 mi14:23:043:27:098:388:58
8:58
#17709
40K
24.85 mi14:30:593:35:048:397:55
9:16
#17717
25.2M
25.20 mi14:34:293:38:348:403:30
10:09
#17707
Finish
26.22 mi14:44:013:48:068:429:32
9:21
#17865
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi20242125391253917851(Top 63%)11570(Top 72%)11570(Top 205%)
10K6.21 mi3.10 mi19336+90612194+34512194+34518362(Top 65%)11788(Top 73%)11788(Top 209%)
15K9.32 mi3.11 mi18842+49411970+22411970+22417851(Top 63%)11570(Top 72%)11570(Top 205%)
20K12.43 mi3.11 mi18499+34311828+14211828+14217582(Top 62%)11434(Top 71%)11434(Top 203%)
Half13.11 mi0.68 mi18445+5411810+1811810+1817450(Top 61%)11389(Top 71%)11389(Top 202%)
25K15.53 mi2.42 mi18049+39611609+20111609+20116286(Top 57%)10769(Top 67%)10769(Top 191%)
30K18.64 mi3.11 mi17901+14811505+10411505+10417511(Top 62%)11153(Top 69%)11153(Top 198%)
20M20.00 mi1.36 mi17932-3111496+911496+918265(Top 64%)11344(Top 70%)11344(Top 201%)
21M21.00 mi1.00 mi18030-9811527-3111527-3118906(Top 67%)11566(Top 72%)11566(Top 205%)
35K21.75 mi0.75 mi17930+10011478+4911478+4915530(Top 55%)9961(Top 62%)9961(Top 177%)
23M23.00 mi1.25 mi17761+16911345+13311345+13315701(Top 55%)9945(Top 62%)9945(Top 176%)
24M24.00 mi1.00 mi17709+5211292+5311292+5317178(Top 60%)10549(Top 66%)10549(Top 187%)
40K24.85 mi0.85 mi17717-811273+1911273+1917631(Top 62%)10652(Top 66%)10652(Top 189%)
25.2M25.20 mi0.35 mi17707+1011257+1611257+1617639(Top 62%)10662(Top 66%)10662(Top 189%)
Finish26.22 mi1.02 mi17865-15811321-6411321-6420597(Top 73%)12098(Top 75%)12098(Top 214%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21stories
+97ft-345ft

Overall

17851

Males

11570

M18-39

11570

5K→10K

3.1 - 6.2 mi

Top 65%
×5stories
+79ft-138ft

Overall

18362

Males

11788

M18-39

11788

10K→15K

6.2 - 9.3 mi

Top 63%
×3stories
+67ft-78ft

Overall

17851

Males

11570

M18-39

11570

15K→20K

9.3 - 12.4 mi

Top 62%
×5stories
+106ft-86ft

Overall

17582

Males

11434

M18-39

11434

20K→Half

12.4 - 13.1 mi

Top 61%
×2stories
+19ft-37ft

Overall

17450

Males

11389

M18-39

11389

Half→25K

13.1 - 15.5 mi

Top 57%
×4stories
+66ft-88ft

Overall

16286

Males

10769

M18-39

10769

25K→30K

15.5 - 18.6 mi

Top 62%
×9stories
+181ft-148ft

Overall

17511

Males

11153

M18-39

11153

30K→20M

18.6 - 20.0 mi

Top 64%
×5stories
+64ft-50ft

Overall

18265

Males

11344

M18-39

11344

20M→21M

20.0 - 21.0 mi

Top 67%
×8stories
+106ft-24ft

Overall

18906

Males

11566

M18-39

11566

21M→35K

21.0 - 21.8 mi

Top 55%
×7stories
+17ft-86ft

Overall

15530

Males

9961

M18-39

9961

35K→23M

21.8 - 23.0 mi

Top 55%
×5stories
+23ft-63ft

Overall

15701

Males

9945

M18-39

9945

23M→24M

23.0 - 24.0 mi

Top 60%
×6stories
+12ft-82ft

Overall

17178

Males

10549

M18-39

10549

24M→40K

24.0 - 24.9 mi

Top 62%
×1story
+6ft-20ft

Overall

17631

Males

10652

M18-39

10652

40K→25.2M

24.9 - 25.2 mi

Top 62%
×1story
+13ft-16ft

Overall

17639

Males

10662

M18-39

10662

25.2M→Finish

25.2 - 26.2 mi

Top 73%
×2stories
+22ft-21ft

Overall

20597

Males

12098

M18-39

12098

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
3367
Passed By
990
Net Change
+2377
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20242
5K → 10K94135+906#20242#19336
10K → 15K53440+494#19336#18842
15K → 20K39754+343#18842#18499
20K → Half6814+54#18499#18445
Half → 25K40913+396#18445#18049
25K → 30K311163+148#18049#17901
30K → 20M103134-31#17901#17932
20M → 21M68166-98#17932#18030
21M → 35K11010+100#18030#17930
35K → 23M19930+169#17930#17761
23M → 24M10452+52#17761#17709
24M → 40K5866-8#17709#17717
40K → 25.2M3828+10#17717#17707
25.2M → Finish27185-158#17707#17865
TOTALS3367990+2377
📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

Loading...

🎨Heatmap Timeline

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Activity Data

Upload your GPX file to see detailed activity metrics

Upload your GPX file

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

.gpx files up to 10MB

Export & Support

Download your data, get help, and share your feedback

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