Boston Marathon logo
BOSTON MARATHON 2023

Marshall Shaw

Bib: 3598•M

OK

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 31%
Gender (Male)
#0 / 15176
Top 45%
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:46
Rank: #6286
Start → 5K
21:46 | 7:00/mi
10K· 6.21 mi
43:49
Rank: #6812 (-526)
5K → 10K
22:03 | 7:06/mi
15K· 9.32 mi
1:06:28
Rank: #7301 (-489)
10K → 15K
22:39 | 7:17/mi
20K· 12.43 mi
1:28:41
Rank: #7139 (+162)
15K → 20K
22:13 | 7:09/mi
Half· 13.11 mi
1:33:25
Rank: #7092 (+47)
20K → Half
4:44 | 6:56/mi
25K· 15.53 mi
1:50:33
Rank: #6869 (+223)
Half → 25K
17:08 | 7:04/mi
30K· 18.64 mi
2:13:14
Rank: #6669 (+200)
25K → 30K
22:41 | 7:18/mi
20M
2:23:09
Rank: #6561 (+108)
30K → 20M
9:55 | 7:18/mi
21M
2:31:33
Rank: #6684 (-123)
20M → 21M
8:24 | 8:24/mi
35K· 21.75 mi
2:37:13
Rank: #6722 (-38)
21M → 35K
5:40 | 7:34/mi
23M
2:48:04
Rank: #7044 (-322)
35K → 23M
10:51 | 8:40/mi
24M
2:56:07
Rank: #7210 (-166)
23M → 24M
8:03 | 8:03/mi
40K· 24.85 mi
3:04:19
Rank: #7660 (-450)
24M → 40K
8:12 | 9:35/mi
25.2M
3:07:39
Rank: #7821 (-161)
40K → 25.2M
3:20 | 9:40/mi
Finish· 26.22 mi
3:16:47
Rank: #8227 (-406)
25.2M → Finish
9:08 | 8:58/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
Time1:33:25
Pace7:08 /mi
2nd Half
Distance13.11 mi
Time1:43:22
Pace7:53 /mi
📊Positive Split: 10.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:47:1521:467:0021:46
7:00
-
10K
6.21 mi11:09:1843:497:0322:03
7:06
+0:06
15K
9.32 mi11:31:571:06:287:0822:39
7:17
+0:11
20K
12.43 mi11:54:101:28:417:0822:13
7:09
-0:08
Half
13.11 mi11:58:541:33:257:084:44
6:56
-0:13
25K
15.53 mi12:16:021:50:337:0717:08
7:04
+0:08
30K
18.64 mi12:38:432:13:147:0922:41
7:18
+0:14
20M
20.00 mi12:48:382:23:097:099:55
7:18
0:00
21M
21.00 mi12:57:022:31:337:138:24
8:24
+1:06
35K
21.75 mi13:02:422:37:137:145:40
7:34
-0:50
23M
23.00 mi13:13:332:48:047:1810:51
8:40
+1:06
24M
24.00 mi13:21:362:56:077:208:03
8:03
-0:37
40K
24.85 mi13:29:483:04:197:258:12
9:35
+1:32
25.2M
25.20 mi13:33:083:07:397:273:20
9:40
+0:05
Finish
26.22 mi13:42:163:16:477:319:08
8:58
-0:42

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

6:56 /mi

Average Pace

7:31 /mi

Slowest Pace

9:40 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

2:28:49

76% of race

Time at Slower Pace

47:58

24% of race

Average Pace: 7:30 /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 mi10:47:1521:467:0021:46
7:00
#6286
10K
6.21 mi11:09:1843:497:0322:03
7:06
#6812
15K
9.32 mi11:31:571:06:287:0822:39
7:17
#7301
20K
12.43 mi11:54:101:28:417:0822:13
7:09
#7139
Half
13.11 mi11:58:541:33:257:084:44
6:56
#7092
25K
15.53 mi12:16:021:50:337:0717:08
7:04
#6869
30K
18.64 mi12:38:432:13:147:0922:41
7:18
#6669
20M
20.00 mi12:48:382:23:097:099:55
7:18
#6561
21M
21.00 mi12:57:022:31:337:138:24
8:24
#6684
35K
21.75 mi13:02:422:37:137:145:40
7:34
#6722
23M
23.00 mi13:13:332:48:047:1810:51
8:40
#7044
24M
24.00 mi13:21:362:56:077:208:03
8:03
#7210
40K
24.85 mi13:29:483:04:197:258:12
9:35
#7660
25.2M
25.20 mi13:33:083:07:397:273:20
9:40
#7821
Finish
26.22 mi13:42:163:16:477:319:08
8:58
#8227
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi6286572757278470(Top 32%)7220(Top 48%)7220(Top 137%)
10K6.21 mi3.10 mi6812-5266125-3986125-3987421(Top 28%)6546(Top 43%)6546(Top 124%)
15K9.32 mi3.11 mi7301-4896478-3536478-3538470(Top 32%)7220(Top 48%)7220(Top 137%)
20K12.43 mi3.11 mi7139+1626350+1286350+1286816(Top 26%)6078(Top 40%)6078(Top 115%)
Half13.11 mi0.68 mi7092+476316+346316+346234(Top 23%)5677(Top 37%)5677(Top 107%)
25K15.53 mi2.42 mi6869+2236143+1736143+1735943(Top 22%)5408(Top 36%)5408(Top 102%)
30K18.64 mi3.11 mi6669+2005966+1775966+1776034(Top 23%)5390(Top 36%)5390(Top 102%)
20M20.00 mi1.36 mi6561+1085873+935873+935637(Top 21%)5030(Top 33%)5030(Top 95%)
21M21.00 mi1.00 mi6684-1235949-765949-769810(Top 37%)7496(Top 49%)7496(Top 142%)
35K21.75 mi0.75 mi6722-385976-275976-279043(Top 34%)7086(Top 47%)7086(Top 134%)
23M23.00 mi1.25 mi7044-3226181-2056181-20514131(Top 53%)9411(Top 62%)9411(Top 178%)
24M24.00 mi1.00 mi7210-1666275-946275-9411540(Top 43%)8163(Top 54%)8163(Top 154%)
40K24.85 mi0.85 mi7660-4506556-2816556-28118609(Top 70%)11299(Top 74%)11299(Top 214%)
25.2M25.20 mi0.35 mi7821-1616649-936649-9315872(Top 60%)10036(Top 66%)10036(Top 190%)
Finish26.22 mi1.02 mi8227-4066875-2266875-22617755(Top 67%)10939(Top 72%)10939(Top 207%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 32%
×21stories
+97ft-345ft

Overall

8470

Males

7220

M18-39

7220

5K→10K

3.1 - 6.2 mi

Top 28%
×5stories
+79ft-138ft

Overall

7421

Males

6546

M18-39

6546

10K→15K

6.2 - 9.3 mi

Top 32%
×3stories
+67ft-78ft

Overall

8470

Males

7220

M18-39

7220

15K→20K

9.3 - 12.4 mi

Top 26%
×5stories
+106ft-86ft

Overall

6816

Males

6078

M18-39

6078

20K→Half

12.4 - 13.1 mi

Top 23%
×2stories
+19ft-37ft

Overall

6234

Males

5677

M18-39

5677

Half→25K

13.1 - 15.5 mi

Top 22%
×4stories
+66ft-88ft

Overall

5943

Males

5408

M18-39

5408

25K→30K

15.5 - 18.6 mi

Top 23%
×9stories
+181ft-148ft

Overall

6034

Males

5390

M18-39

5390

30K→20M

18.6 - 20.0 mi

Top 21%
×5stories
+64ft-50ft

Overall

5637

Males

5030

M18-39

5030

20M→21M

20.0 - 21.0 mi

Top 37%
×8stories
+106ft-24ft

Overall

9810

Males

7496

M18-39

7496

21M→35K

21.0 - 21.8 mi

Top 34%
×7stories
+17ft-86ft

Overall

9043

Males

7086

M18-39

7086

35K→23M

21.8 - 23.0 mi

Top 53%
×5stories
+23ft-63ft

Overall

14131

Males

9411

M18-39

9411

23M→24M

23.0 - 24.0 mi

Top 43%
×6stories
+12ft-82ft

Overall

11540

Males

8163

M18-39

8163

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

18609

Males

11299

M18-39

11299

40K→25.2M

24.9 - 25.2 mi

Top 60%
×1story
+13ft-16ft

Overall

15872

Males

10036

M18-39

10036

25.2M→Finish

25.2 - 26.2 mi

Top 67%
×2stories
+22ft-21ft

Overall

17755

Males

10939

M18-39

10939

Passing Analysis

Category:
Athletes Passed
1008
Passed By
2949
Net Change
-1941
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6286
5K → 10K39565-526#6286#6812
10K → 15K21510-489#6812#7301
15K → 20K19735+162#7301#7139
20K → Half503+47#7139#7092
Half → 25K2318+223#7092#6869
25K → 30K22828+200#6869#6669
30K → 20M12113+108#6669#6561
20M → 21M28151-123#6561#6684
21M → 35K3068-38#6684#6722
35K → 23M24346-322#6722#7044
23M → 24M18184-166#7044#7210
24M → 40K10460-450#7210#7660
40K → 25.2M4165-161#7660#7821
25.2M → Finish7413-406#7821#8227
TOTALS10082949-1941
📊

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