Boston Marathon logo
BOSTON MARATHON 2023

Thom Clark

Bib: 14355•M

MO

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 36%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 40%
Division (M55-59)
#0 / 1422
Top 22%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:33
Rank: #10334
Start → 5K
23:33 | 7:35/mi
10K· 6.21 mi
47:03
Rank: #10650 (-316)
5K → 10K
23:30 | 7:34/mi
15K· 9.32 mi
1:10:33
Rank: #10650
10K → 15K
23:30 | 7:34/mi
20K· 12.43 mi
1:34:22
Rank: #10647 (+3)
15K → 20K
23:49 | 7:40/mi
Half· 13.11 mi
1:39:31
Rank: #10648 (-1)
20K → Half
5:09 | 7:33/mi
25K· 15.53 mi
1:58:10
Rank: #10536 (+112)
Half → 25K
18:39 | 7:42/mi
30K· 18.64 mi
2:22:35
Rank: #10354 (+182)
25K → 30K
24:25 | 7:52/mi
20M
2:33:18
Rank: #10273 (+81)
30K → 20M
10:43 | 7:53/mi
21M
2:41:33
Rank: #10155 (+118)
20M → 21M
8:15 | 8:15/mi
35K· 21.75 mi
2:47:16
Rank: #10124 (+31)
21M → 35K
5:43 | 7:38/mi
23M
2:57:15
Rank: #10052 (+72)
35K → 23M
9:59 | 7:58/mi
24M
3:04:55
Rank: #9984 (+68)
23M → 24M
7:40 | 7:40/mi
40K· 24.85 mi
3:11:34
Rank: #9891 (+93)
24M → 40K
6:39 | 7:47/mi
25.2M
3:14:22
Rank: #9823 (+68)
40K → 25.2M
2:48 | 8:07/mi
Finish· 26.22 mi
3:21:53
Rank: #9689 (+134)
25.2M → Finish
7:31 | 7:23/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
Time1:39:31
Pace7:35 /mi
2nd Half
Distance13.11 mi
Time1:42:22
Pace7:49 /mi
📊Positive Split: 2.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:4323:337:3523:33
7:35
-
10K
6.21 mi11:17:1347:037:3423:30
7:34
-0:01
15K
9.32 mi11:40:431:10:337:3423:30
7:34
0:00
20K
12.43 mi12:04:321:34:227:3623:49
7:40
+0:06
Half
13.11 mi12:09:411:39:317:355:09
7:33
-0:07
25K
15.53 mi12:28:201:58:107:3618:39
7:42
+0:09
30K
18.64 mi12:52:452:22:357:3924:25
7:52
+0:10
20M
20.00 mi13:03:282:33:187:4010:43
7:53
+0:01
21M
21.00 mi13:11:432:41:337:428:15
8:15
+0:22
35K
21.75 mi13:17:262:47:167:415:43
7:38
-0:37
23M
23.00 mi13:27:252:57:157:429:59
7:58
+0:20
24M
24.00 mi13:35:053:04:557:427:40
7:40
-0:18
40K
24.85 mi13:41:443:11:347:426:39
7:47
+0:07
25.2M
25.20 mi13:44:323:14:227:432:48
8:07
+0:20
Finish
26.22 mi13:52:033:21:537:427:31
7:23
-0:44

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

7:23 /mi

Average Pace

7:42 /mi

Slowest Pace

8:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:13:38

96% of race

Time at Steady Pace

8:15

4% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:42 /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

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:53:4323:337:3523:33
7:35
#10334
10K
6.21 mi11:17:1347:037:3423:30
7:34
#10650
15K
9.32 mi11:40:431:10:337:3423:30
7:34
#10650
20K
12.43 mi12:04:321:34:227:3623:49
7:40
#10647
Half
13.11 mi12:09:411:39:317:355:09
7:33
#10648
25K
15.53 mi12:28:201:58:107:3618:39
7:42
#10536
30K
18.64 mi12:52:452:22:357:3924:25
7:52
#10354
20M
20.00 mi13:03:282:33:187:4010:43
7:53
#10273
21M
21.00 mi13:11:432:41:337:428:15
8:15
#10155
35K
21.75 mi13:17:262:47:167:415:43
7:38
#10124
23M
23.00 mi13:27:252:57:157:429:59
7:58
#10052
24M
24.00 mi13:35:053:04:557:427:40
7:40
#9984
40K
24.85 mi13:41:443:11:347:426:39
7:47
#9891
25.2M
25.20 mi13:44:323:14:227:432:48
8:07
#9823
Finish
26.22 mi13:52:033:21:537:427:31
7:23
#9689
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi103348311831110685(Top 40%)8493(Top 56%)8493(Top 597%)
10K6.21 mi3.10 mi10650-3168491-1808491-18010971(Top 41%)8660(Top 57%)8660(Top 609%)
15K9.32 mi3.11 mi106508497-68497-610685(Top 40%)8493(Top 56%)8493(Top 597%)
20K12.43 mi3.11 mi10647+38480+178480+1710621(Top 40%)8389(Top 55%)8389(Top 590%)
Half13.11 mi0.68 mi10648-18480848010542(Top 40%)8364(Top 55%)8364(Top 588%)
25K15.53 mi2.42 mi10536+1128411+698411+6910221(Top 38%)8110(Top 53%)8110(Top 570%)
30K18.64 mi3.11 mi10354+1828262+1498262+1499808(Top 37%)7724(Top 51%)7724(Top 543%)
20M20.00 mi1.36 mi10273+818202+608202+609453(Top 36%)7444(Top 49%)7444(Top 523%)
21M21.00 mi1.00 mi10155+1188122+808122+808894(Top 33%)7008(Top 46%)7008(Top 493%)
35K21.75 mi0.75 mi10124+318088+348088+349527(Top 36%)7364(Top 49%)7364(Top 518%)
23M23.00 mi1.25 mi10052+728019+698019+699555(Top 36%)7259(Top 48%)7259(Top 510%)
24M24.00 mi1.00 mi9984+687942+777942+778841(Top 33%)6810(Top 45%)6810(Top 479%)
40K24.85 mi0.85 mi9891+937866+767866+768510(Top 32%)6562(Top 43%)6562(Top 461%)
25.2M25.20 mi0.35 mi9823+687820+467820+467211(Top 27%)5725(Top 38%)5725(Top 403%)
Finish26.22 mi1.02 mi9689+1347715+1057715+1057616(Top 29%)5945(Top 39%)5945(Top 418%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 40%
×21stories
+97ft-345ft

Overall

10685

Males

8493

M55-59

8493

5K→10K

3.1 - 6.2 mi

Top 41%
×5stories
+79ft-138ft

Overall

10971

Males

8660

M55-59

8660

10K→15K

6.2 - 9.3 mi

Top 40%
×3stories
+67ft-78ft

Overall

10685

Males

8493

M55-59

8493

15K→20K

9.3 - 12.4 mi

Top 40%
×5stories
+106ft-86ft

Overall

10621

Males

8389

M55-59

8389

20K→Half

12.4 - 13.1 mi

Top 40%
×2stories
+19ft-37ft

Overall

10542

Males

8364

M55-59

8364

Half→25K

13.1 - 15.5 mi

Top 38%
×4stories
+66ft-88ft

Overall

10221

Males

8110

M55-59

8110

25K→30K

15.5 - 18.6 mi

Top 37%
×9stories
+181ft-148ft

Overall

9808

Males

7724

M55-59

7724

30K→20M

18.6 - 20.0 mi

Top 36%
×5stories
+64ft-50ft

Overall

9453

Males

7444

M55-59

7444

20M→21M

20.0 - 21.0 mi

Top 33%
×8stories
+106ft-24ft

Overall

8894

Males

7008

M55-59

7008

21M→35K

21.0 - 21.8 mi

Top 36%
×7stories
+17ft-86ft

Overall

9527

Males

7364

M55-59

7364

35K→23M

21.8 - 23.0 mi

Top 36%
×5stories
+23ft-63ft

Overall

9555

Males

7259

M55-59

7259

23M→24M

23.0 - 24.0 mi

Top 33%
×6stories
+12ft-82ft

Overall

8841

Males

6810

M55-59

6810

24M→40K

24.0 - 24.9 mi

Top 32%
×1story
+6ft-20ft

Overall

8510

Males

6562

M55-59

6562

40K→25.2M

24.9 - 25.2 mi

Top 27%
×1story
+13ft-16ft

Overall

7211

Males

5725

M55-59

5725

25.2M→Finish

25.2 - 26.2 mi

Top 29%
×2stories
+22ft-21ft

Overall

7616

Males

5945

M55-59

5945

Passing Analysis

Category:
Athletes Passed
1857*
Passed By
1212
Net Change
+645
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10334
5K → 10K163479-316#10334#10650
10K → 15K1861860#10650#10650
15K → 20K161158+3#10650#10647
20K → Half3031-1#10647#10648
Half → 25K17462+112#10648#10536
25K → 30K25472+182#10536#10354
30K → 20M121*40+81#10354#10273
20M → 21M14628+118#10273#10155
21M → 35K5524+31#10155#10124
35K → 23M11644+72#10124#10052
23M → 24M11042+68#10052#9984
24M → 40K12128+93#9984#9891
40K → 25.2M702+68#9891#9823
25.2M → Finish150*16+134#9823#9689
TOTALS1857*1212+645

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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