Boston Marathon logo
BOSTON MARATHON 2025

Shinichiro Nasu

Bib: 19276•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M55-59)
#0 / 1648
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:57/mi
24:43
↑ 97↓ 3451.5%
10K· 6.21 mi
7:59/mi
49:31
↑ 79↓ 1380.4%
15K· 9.32 mi
8:10/mi
1:14:54
↑ 67↓ 78
20K· 12.43 mi
8:12/mi
1:40:22
↑ 106↓ 860.1%
Half· 13.11 mi
8:10/mi
1:45:56
↑ 19↓ 370.5%
25K· 15.53 mi
8:45/mi
2:07:08
↑ 66↓ 880.2%
30K· 18.64 mi
9:14/mi
2:35:49
↑ 181↓ 1480.2%
20M
9:46/mi
2:49:06
↑ 64↓ 500.2%
21M
9:43/mi
2:58:49
↑ 106↓ 241.6%
35K· 21.75 mi
8:55/mi
3:05:29
↑ 17↓ 861.7%
23M
9:02/mi
3:16:47
↑ 23↓ 630.6%
24M
8:42/mi
3:25:29
↓ 821.3%
40K· 24.85 mi
8:40/mi
3:32:54
↓ 200.3%
25.2M
9:17/mi
3:36:06
↑ 13↓ 160.2%
Finish· 26.22 mi
7:51/mi
3:44:06
↑ 22↓ 21

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
Time1:45:56
Pace8:05 /mi
2nd Half
Distance13.11 mi
Time1:58:10
Pace9:01 /mi
📊Positive Split: 11.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:4024:437:5724:43
7:57
-
10K
6.21 mi11:41:2849:317:5824:48
7:59
+0:02
15K
9.32 mi12:06:511:14:548:0225:23
8:10
+0:11
20K
12.43 mi12:32:191:40:228:0525:28
8:12
+0:02
Half
13.11 mi12:37:531:45:568:055:34
8:10
-0:02
25K
15.53 mi12:59:052:07:088:1121:12
8:45
+0:35
30K
18.64 mi13:27:462:35:498:2228:41
9:14
+0:29
20M
20.00 mi13:41:032:49:068:2713:17
9:46
+0:32
21M
21.00 mi13:50:462:58:498:319:43
9:43
-0:03
35K
21.75 mi13:57:263:05:298:326:40
8:55
-0:48
23M
23.00 mi14:08:443:16:478:3311:18
9:02
+0:07
24M
24.00 mi14:17:263:25:298:348:42
8:42
-0:20
40K
24.85 mi14:24:513:32:548:347:25
8:40
-0:02
25.2M
25.20 mi14:28:033:36:068:353:12
9:17
+0:37
Finish
26.22 mi14:36:033:44:068:338:00
7:51
-1:26

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

7:51 /mi

Average Pace

8:33 /mi

Slowest Pace

9:46 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:53:56

51% of race

Time at Steady Pace

43:59

20% of race

Time at Slower Pace

1:06:11

30% of race

Average Pace: 8:33 /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 mi11:16:4024:437:5724:43
7:57
#16233
10K
6.21 mi11:41:2849:317:5824:48
7:59
#16246
15K
9.32 mi12:06:511:14:548:0225:23
8:10
#16605
20K
12.43 mi12:32:191:40:228:0525:28
8:12
#16502
Half
13.11 mi12:37:531:45:568:055:34
8:10
#16537
25K
15.53 mi12:59:052:07:088:1121:12
8:45
#16859
30K
18.64 mi13:27:462:35:498:2228:41
9:14
#17190
20M
20.00 mi13:41:032:49:068:2713:17
9:46
#17488
21M
21.00 mi13:50:462:58:498:319:43
9:43
#17463
35K
21.75 mi13:57:263:05:298:326:40
8:55
#17462
23M
23.00 mi14:08:443:16:478:3311:18
9:02
#17380
24M
24.00 mi14:17:263:25:298:348:42
8:42
#17300
40K
24.85 mi14:24:513:32:548:347:25
8:40
#17175
25.2M
25.20 mi14:28:033:36:068:353:12
9:17
#17113
Finish
26.22 mi14:36:033:44:068:338:00
7:51
#16935
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi16233109011090117197(Top 61%)11300(Top 70%)11300(Top 686%)
10K6.21 mi3.10 mi16246-1310906-510906-516335(Top 58%)10964(Top 68%)10964(Top 665%)
15K9.32 mi3.11 mi16605-35911066-16011066-16017197(Top 61%)11300(Top 70%)11300(Top 686%)
20K12.43 mi3.11 mi16502+10311019+4711019+4716281(Top 57%)10863(Top 67%)10863(Top 659%)
Half13.11 mi0.68 mi16537-3511030-1111030-1116983(Top 60%)11174(Top 69%)11174(Top 678%)
25K15.53 mi2.42 mi16859-32211132-10211132-10218627(Top 66%)11803(Top 73%)11803(Top 716%)
30K18.64 mi3.11 mi17190-33111210-7811210-7818780(Top 66%)11731(Top 73%)11731(Top 712%)
20M20.00 mi1.36 mi17488-29811294-8411294-8420197(Top 71%)12229(Top 76%)12229(Top 742%)
21M21.00 mi1.00 mi17463+2511263+3111263+3117092(Top 60%)10737(Top 67%)10737(Top 652%)
35K21.75 mi0.75 mi17462+111242+2111242+2117782(Top 63%)10954(Top 68%)10954(Top 665%)
23M23.00 mi1.25 mi17380+8211173+6911173+6916404(Top 58%)10246(Top 64%)10246(Top 622%)
24M24.00 mi1.00 mi17300+8011116+5711116+5715736(Top 55%)9932(Top 62%)9932(Top 603%)
40K24.85 mi0.85 mi17175+12511041+7511041+7514462(Top 51%)9211(Top 57%)9211(Top 559%)
25.2M25.20 mi0.35 mi17113+6211001+4011001+4013335(Top 47%)8641(Top 54%)8641(Top 524%)
Finish26.22 mi1.02 mi16935+17810912+8910912+8911816(Top 42%)7954(Top 49%)7954(Top 483%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 61%
×21story building
+97ft-345ft

Overall

17197

Males

11300

M55-59

11300

5K→10K

3.1 - 6.2 mi

Top 58%
×5story building
+79ft-138ft

Overall

16335

Males

10964

M55-59

10964

10K→15K

6.2 - 9.3 mi

Top 61%
×3story building
+67ft-78ft

Overall

17197

Males

11300

M55-59

11300

15K→20K

9.3 - 12.4 mi

Top 57%
×5story building
+106ft-86ft

Overall

16281

Males

10863

M55-59

10863

20K→Half

12.4 - 13.1 mi

Top 60%
×2story building
+19ft-37ft

Overall

16983

Males

11174

M55-59

11174

Half→25K

13.1 - 15.5 mi

Top 66%
×4story building
+66ft-88ft

Overall

18627

Males

11803

M55-59

11803

25K→30K

15.5 - 18.6 mi

Top 66%
×9story building
+181ft-148ft

Overall

18780

Males

11731

M55-59

11731

30K→20M

18.6 - 20.0 mi

Top 71%
×5story building
+64ft-50ft

Overall

20197

Males

12229

M55-59

12229

20M→21M

20.0 - 21.0 mi

Top 60%
×8story building
+106ft-24ft

Overall

17092

Males

10737

M55-59

10737

21M→35K

21.0 - 21.8 mi

Top 63%
×7story building
+17ft-86ft

Overall

17782

Males

10954

M55-59

10954

35K→23M

21.8 - 23.0 mi

Top 58%
×5story building
+23ft-63ft

Overall

16404

Males

10246

M55-59

10246

23M→24M

23.0 - 24.0 mi

Top 55%
×6story building
+12ft-82ft

Overall

15736

Males

9932

M55-59

9932

24M→40K

24.0 - 24.9 mi

Top 51%
×1story
+6ft-20ft

Overall

14462

Males

9211

M55-59

9211

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13335

Males

8641

M55-59

8641

25.2M→Finish

25.2 - 26.2 mi

Top 42%
×2story building
+22ft-21ft

Overall

11816

Males

7954

M55-59

7954

Passing Analysis

Category:
Athletes Passed
1782
Passed By
2484
Net Change
-702
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16233
5K → 10K288301-13#16233#16246
10K → 15K107466-359#16246#16605
15K → 20K255152+103#16605#16502
20K → Half2156-35#16502#16537
Half → 25K80402-322#16537#16859
25K → 30K138469-331#16859#17190
30K → 20M46344-298#17190#17488
20M → 21M11287+25#17488#17463
21M → 35K7473+1#17463#17462
35K → 23M14563+82#17462#17380
23M → 24M12040+80#17380#17300
24M → 40K13813+125#17300#17175
40K → 25.2M7210+62#17175#17113
25.2M → Finish1868+178#17113#16935
TOTALS17822484-702
📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing