Boston Marathon logo
BOSTON MARATHON 2023

Nobu Shan

Bib: 19299•M

PA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M55-59)
#0 / 1422
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:57
Rank: #16505
Start → 5K
25:57 | 8:21/mi
10K· 6.21 mi
51:39
Rank: #16592 (-87)
5K → 10K
25:42 | 8:16/mi
15K· 9.32 mi
1:17:13
Rank: #16396 (+196)
10K → 15K
25:34 | 8:14/mi
20K· 12.43 mi
1:43:02
Rank: #16199 (+197)
15K → 20K
25:49 | 8:19/mi
Half· 13.11 mi
1:48:44
Rank: #16240 (-41)
20K → Half
5:42 | 8:21/mi
25K· 15.53 mi
2:09:49
Rank: #16451 (-211)
Half → 25K
21:05 | 8:42/mi
30K· 18.64 mi
2:37:41
Rank: #16513 (-62)
25K → 30K
27:52 | 8:58/mi
20M
2:49:45
Rank: #16442 (+71)
30K → 20M
12:04 | 8:53/mi
21M
2:59:16
Rank: #16404 (+38)
20M → 21M
9:31 | 9:31/mi
35K· 21.75 mi
3:05:54
Rank: #16439 (-35)
21M → 35K
6:38 | 8:52/mi
23M
3:17:22
Rank: #16461 (-22)
35K → 23M
11:28 | 9:09/mi
24M
3:25:58
Rank: #16386 (+75)
23M → 24M
8:36 | 8:36/mi
40K· 24.85 mi
3:33:26
Rank: #16298 (+88)
24M → 40K
7:28 | 8:44/mi
25.2M
3:36:42
Rank: #16277 (+21)
40K → 25.2M
3:16 | 9:28/mi
Finish· 26.22 mi
3:45:25
Rank: #16262 (+15)
25.2M → Finish
8:43 | 8:33/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
Time1:48:44
Pace8:18 /mi
2nd Half
Distance13.11 mi
Time1:56:41
Pace8:54 /mi
📊Positive Split: 7.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:2225:578:2125:57
8:21
-
10K
6.21 mi11:45:0451:398:1925:42
8:16
-0:05
15K
9.32 mi12:10:381:17:138:1725:34
8:14
-0:02
20K
12.43 mi12:36:271:43:028:1725:49
8:19
+0:05
Half
13.11 mi12:42:091:48:448:185:42
8:21
+0:02
25K
15.53 mi13:03:142:09:498:2121:05
8:42
+0:21
30K
18.64 mi13:31:062:37:418:2827:52
8:58
+0:16
20M
20.00 mi13:43:102:49:458:2912:04
8:53
-0:05
21M
21.00 mi13:52:412:59:168:329:31
9:31
+0:38
35K
21.75 mi13:59:193:05:548:336:38
8:52
-0:39
23M
23.00 mi14:10:473:17:228:3511:28
9:09
+0:17
24M
24.00 mi14:19:233:25:588:358:36
8:36
-0:33
40K
24.85 mi14:26:513:33:268:357:28
8:44
+0:08
25.2M
25.20 mi14:30:073:36:428:363:16
9:28
+0:44
Finish
26.22 mi14:38:503:45:258:368:43
8:33
-0:55

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

8:14 /mi

Average Pace

8:36 /mi

Slowest Pace

9:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:21:10

89% of race

Time at Steady Pace

24:15

11% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:36 /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 mi11:19:2225:578:2125:57
8:21
#16505
10K
6.21 mi11:45:0451:398:1925:42
8:16
#16592
15K
9.32 mi12:10:381:17:138:1725:34
8:14
#16396
20K
12.43 mi12:36:271:43:028:1725:49
8:19
#16199
Half
13.11 mi12:42:091:48:448:185:42
8:21
#16240
25K
15.53 mi13:03:142:09:498:2121:05
8:42
#16451
30K
18.64 mi13:31:062:37:418:2827:52
8:58
#16513
20M
20.00 mi13:43:102:49:458:2912:04
8:53
#16442
21M
21.00 mi13:52:412:59:168:329:31
9:31
#16404
35K
21.75 mi13:59:193:05:548:336:38
8:52
#16439
23M
23.00 mi14:10:473:17:228:3511:28
9:09
#16461
24M
24.00 mi14:19:233:25:588:358:36
8:36
#16386
40K
24.85 mi14:26:513:33:268:357:28
8:44
#16298
25.2M
25.20 mi14:30:073:36:428:363:16
9:28
#16277
Finish
26.22 mi14:38:503:45:258:368:43
8:33
#16262
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi16505108791087916058(Top 60%)10714(Top 71%)10714(Top 753%)
10K6.21 mi3.10 mi16592-8710935-5610935-5616725(Top 63%)11000(Top 72%)11000(Top 774%)
15K9.32 mi3.11 mi16396+19610850+8510850+8516058(Top 60%)10714(Top 71%)10714(Top 753%)
20K12.43 mi3.11 mi16199+19710758+9210758+9215655(Top 59%)10505(Top 69%)10505(Top 739%)
Half13.11 mi0.68 mi16240-4110770-1210770-1216782(Top 63%)10983(Top 72%)10983(Top 772%)
25K15.53 mi2.42 mi16451-21110821-5110821-5117341(Top 65%)11120(Top 73%)11120(Top 782%)
30K18.64 mi3.11 mi16513-6210802+1910802+1916995(Top 64%)10913(Top 72%)10913(Top 767%)
20M20.00 mi1.36 mi16442+7110752+5010752+5015881(Top 60%)10364(Top 68%)10364(Top 729%)
21M21.00 mi1.00 mi16404+3810732+2010732+2016014(Top 60%)10357(Top 68%)10357(Top 728%)
35K21.75 mi0.75 mi16439-3510737-510737-517253(Top 65%)10810(Top 71%)10810(Top 760%)
23M23.00 mi1.25 mi16461-2210732+510732+516829(Top 63%)10607(Top 70%)10607(Top 746%)
24M24.00 mi1.00 mi16386+7510685+4710685+4715045(Top 57%)9776(Top 64%)9776(Top 687%)
40K24.85 mi0.85 mi16298+8810624+6110624+6114700(Top 55%)9550(Top 63%)9550(Top 672%)
25.2M25.20 mi0.35 mi16277+2110612+1210612+1215022(Top 56%)9698(Top 64%)9698(Top 682%)
Finish26.22 mi1.02 mi16262+1510599+1310599+1315716(Top 59%)10045(Top 66%)10045(Top 706%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 60%
×21stories
+97ft-345ft

Overall

16058

Males

10714

M55-59

10714

5K→10K

3.1 - 6.2 mi

Top 63%
×5stories
+79ft-138ft

Overall

16725

Males

11000

M55-59

11000

10K→15K

6.2 - 9.3 mi

Top 60%
×3stories
+67ft-78ft

Overall

16058

Males

10714

M55-59

10714

15K→20K

9.3 - 12.4 mi

Top 59%
×5stories
+106ft-86ft

Overall

15655

Males

10505

M55-59

10505

20K→Half

12.4 - 13.1 mi

Top 63%
×2stories
+19ft-37ft

Overall

16782

Males

10983

M55-59

10983

Half→25K

13.1 - 15.5 mi

Top 65%
×4stories
+66ft-88ft

Overall

17341

Males

11120

M55-59

11120

25K→30K

15.5 - 18.6 mi

Top 64%
×9stories
+181ft-148ft

Overall

16995

Males

10913

M55-59

10913

30K→20M

18.6 - 20.0 mi

Top 60%
×5stories
+64ft-50ft

Overall

15881

Males

10364

M55-59

10364

20M→21M

20.0 - 21.0 mi

Top 60%
×8stories
+106ft-24ft

Overall

16014

Males

10357

M55-59

10357

21M→35K

21.0 - 21.8 mi

Top 65%
×7stories
+17ft-86ft

Overall

17253

Males

10810

M55-59

10810

35K→23M

21.8 - 23.0 mi

Top 63%
×5stories
+23ft-63ft

Overall

16829

Males

10607

M55-59

10607

23M→24M

23.0 - 24.0 mi

Top 57%
×6stories
+12ft-82ft

Overall

15045

Males

9776

M55-59

9776

24M→40K

24.0 - 24.9 mi

Top 55%
×1story
+6ft-20ft

Overall

14700

Males

9550

M55-59

9550

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

15022

Males

9698

M55-59

9698

25.2M→Finish

25.2 - 26.2 mi

Top 59%
×2stories
+22ft-21ft

Overall

15716

Males

10045

M55-59

10045

Passing Analysis

Category:
Athletes Passed
1763
Passed By
1520
Net Change
+243
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16505
5K → 10K262349-87#16505#16592
10K → 15K305109+196#16592#16396
15K → 20K27477+197#16396#16199
20K → Half2667-41#16199#16240
Half → 25K77288-211#16240#16451
25K → 30K171233-62#16451#16513
30K → 20M11039+71#16513#16442
20M → 21M9860+38#16442#16404
21M → 35K3469-35#16404#16439
35K → 23M81103-22#16439#16461
23M → 24M10328+75#16461#16386
24M → 40K11830+88#16386#16298
40K → 25.2M3918+21#16298#16277
25.2M → Finish6550+15#16277#16262
TOTALS17631520+243
📊

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