Boston Marathon logo
BOSTON MARATHON 2023

Bill Clark

Bib: 12459•M

KY

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 39%
Division (M50-54)
#0 / 2052
Top 37%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:45
Rank: #10947
Start → 5K
23:45 | 7:39/mi
10K· 6.21 mi
46:42
Rank: #10179 (+768)
5K → 10K
22:57 | 7:23/mi
15K· 9.32 mi
1:09:27
Rank: #9621 (+558)
10K → 15K
22:45 | 7:19/mi
20K· 12.43 mi
1:32:19
Rank: #9216 (+405)
15K → 20K
22:52 | 7:22/mi
Half· 13.11 mi
1:37:16
Rank: #9166 (+50)
20K → Half
4:57 | 7:15/mi
25K· 15.53 mi
1:55:40
Rank: #9184 (-18)
Half → 25K
18:24 | 7:35/mi
30K· 18.64 mi
2:20:47
Rank: #9605 (-421)
25K → 30K
25:07 | 8:05/mi
20M
2:31:28
Rank: #9548 (+57)
30K → 20M
10:41 | 7:52/mi
21M
2:39:59
Rank: #9570 (-22)
20M → 21M
8:31 | 8:31/mi
35K· 21.75 mi
2:45:51
Rank: #9610 (-40)
21M → 35K
5:52 | 7:51/mi
23M
2:55:57
Rank: #9611 (-1)
35K → 23M
10:06 | 8:04/mi
24M
3:03:57
Rank: #9649 (-38)
23M → 24M
8:00 | 8:00/mi
40K· 24.85 mi
3:10:47
Rank: #9634 (+15)
24M → 40K
6:50 | 8:00/mi
25.2M
3:13:46
Rank: #9625 (+9)
40K → 25.2M
2:59 | 8:39/mi
Finish· 26.22 mi
3:21:24
Rank: #9553 (+72)
25.2M → Finish
7:38 | 7:29/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
Time1:37:16
Pace7:25 /mi
2nd Half
Distance13.11 mi
Time1:44:08
Pace7:57 /mi
📊Positive Split: 7.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:4023:457:3923:45
7:39
-
10K
6.21 mi11:14:3746:427:3122:57
7:23
-0:16
15K
9.32 mi11:37:221:09:277:2722:45
7:19
-0:04
20K
12.43 mi12:00:141:32:197:2622:52
7:22
+0:03
Half
13.11 mi12:05:111:37:167:254:57
7:15
-0:07
25K
15.53 mi12:23:351:55:407:2718:24
7:35
+0:20
30K
18.64 mi12:48:422:20:477:3325:07
8:05
+0:30
20M
20.00 mi12:59:232:31:287:3410:41
7:52
-0:13
21M
21.00 mi13:07:542:39:597:378:31
8:31
+0:39
35K
21.75 mi13:13:462:45:517:385:52
7:51
-0:40
23M
23.00 mi13:23:522:55:577:3910:06
8:04
+0:13
24M
24.00 mi13:31:523:03:577:408:00
8:00
-0:04
40K
24.85 mi13:38:423:10:477:416:50
8:00
0:00
25.2M
25.20 mi13:41:413:13:467:412:59
8:39
+0:39
Finish
26.22 mi13:49:193:21:247:417:38
7:29
-1:10

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

7:15 /mi

Average Pace

7:41 /mi

Slowest Pace

8:39 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:19:51

69% of race

Time at Steady Pace

58:34

29% of race

Time at Slower Pace

2:59

1% of race

Average Pace: 7:41 /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 mi10:51:4023:457:3923:45
7:39
#10947
10K
6.21 mi11:14:3746:427:3122:57
7:23
#10179
15K
9.32 mi11:37:221:09:277:2722:45
7:19
#9621
20K
12.43 mi12:00:141:32:197:2622:52
7:22
#9216
Half
13.11 mi12:05:111:37:167:254:57
7:15
#9166
25K
15.53 mi12:23:351:55:407:2718:24
7:35
#9184
30K
18.64 mi12:48:422:20:477:3325:07
8:05
#9605
20M
20.00 mi12:59:232:31:287:3410:41
7:52
#9548
21M
21.00 mi13:07:542:39:597:378:31
8:31
#9570
35K
21.75 mi13:13:462:45:517:385:52
7:51
#9610
23M
23.00 mi13:23:522:55:577:3910:06
8:04
#9611
24M
24.00 mi13:31:523:03:577:408:00
8:00
#9649
40K
24.85 mi13:38:423:10:477:416:50
8:00
#9634
25.2M
25.20 mi13:41:413:13:467:412:59
8:39
#9625
Finish
26.22 mi13:49:193:21:247:417:38
7:29
#9553
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi10947862886288738(Top 33%)7387(Top 49%)7387(Top 360%)
10K6.21 mi3.10 mi10179+7688247+3818247+3819488(Top 36%)7860(Top 52%)7860(Top 383%)
15K9.32 mi3.11 mi9621+5587939+3087939+3088738(Top 33%)7387(Top 49%)7387(Top 360%)
20K12.43 mi3.11 mi9216+4057683+2567683+2568214(Top 31%)7027(Top 46%)7027(Top 342%)
Half13.11 mi0.68 mi9166+507652+317652+318252(Top 31%)7066(Top 47%)7066(Top 344%)
25K15.53 mi2.42 mi9184-187656-47656-49452(Top 36%)7684(Top 51%)7684(Top 374%)
30K18.64 mi3.11 mi9605-4217874-2187874-21811534(Top 43%)8598(Top 57%)8598(Top 419%)
20M20.00 mi1.36 mi9548+577809+657809+659296(Top 35%)7356(Top 48%)7356(Top 358%)
21M21.00 mi1.00 mi9570-227801+87801+810548(Top 40%)7881(Top 52%)7881(Top 384%)
35K21.75 mi0.75 mi9610-407810-97810-910910(Top 41%)8059(Top 53%)8059(Top 393%)
23M23.00 mi1.25 mi9611-17771+397771+3910216(Top 38%)7597(Top 50%)7597(Top 370%)
24M24.00 mi1.00 mi9649-387774-37774-311206(Top 42%)7990(Top 53%)7990(Top 389%)
40K24.85 mi0.85 mi9634+157741+337741+339966(Top 37%)7317(Top 48%)7317(Top 357%)
25.2M25.20 mi0.35 mi9625+97713+287713+2810388(Top 39%)7486(Top 49%)7486(Top 365%)
Finish26.22 mi1.02 mi9553+727650+637650+638471(Top 32%)6447(Top 42%)6447(Top 314%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 33%
×21stories
+97ft-345ft

Overall

8738

Males

7387

M50-54

7387

5K→10K

3.1 - 6.2 mi

Top 36%
×5stories
+79ft-138ft

Overall

9488

Males

7860

M50-54

7860

10K→15K

6.2 - 9.3 mi

Top 33%
×3stories
+67ft-78ft

Overall

8738

Males

7387

M50-54

7387

15K→20K

9.3 - 12.4 mi

Top 31%
×5stories
+106ft-86ft

Overall

8214

Males

7027

M50-54

7027

20K→Half

12.4 - 13.1 mi

Top 31%
×2stories
+19ft-37ft

Overall

8252

Males

7066

M50-54

7066

Half→25K

13.1 - 15.5 mi

Top 36%
×4stories
+66ft-88ft

Overall

9452

Males

7684

M50-54

7684

25K→30K

15.5 - 18.6 mi

Top 43%
×9stories
+181ft-148ft

Overall

11534

Males

8598

M50-54

8598

30K→20M

18.6 - 20.0 mi

Top 35%
×5stories
+64ft-50ft

Overall

9296

Males

7356

M50-54

7356

20M→21M

20.0 - 21.0 mi

Top 40%
×8stories
+106ft-24ft

Overall

10548

Males

7881

M50-54

7881

21M→35K

21.0 - 21.8 mi

Top 41%
×7stories
+17ft-86ft

Overall

10910

Males

8059

M50-54

8059

35K→23M

21.8 - 23.0 mi

Top 38%
×5stories
+23ft-63ft

Overall

10216

Males

7597

M50-54

7597

23M→24M

23.0 - 24.0 mi

Top 42%
×6stories
+12ft-82ft

Overall

11206

Males

7990

M50-54

7990

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

9966

Males

7317

M50-54

7317

40K→25.2M

24.9 - 25.2 mi

Top 39%
×1story
+13ft-16ft

Overall

10388

Males

7486

M50-54

7486

25.2M→Finish

25.2 - 26.2 mi

Top 32%
×2stories
+22ft-21ft

Overall

8471

Males

6447

M50-54

6447

Passing Analysis

Category:
Athletes Passed
2630*
Passed By
1236
Net Change
+1394
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10947
5K → 10K826*58+768#10947#10179
10K → 15K581*23+558#10179#9621
15K → 20K41914+405#9621#9216
20K → Half533+50#9216#9166
Half → 25K112130-18#9166#9184
25K → 30K72493-421#9184#9605
30K → 20M11053+57#9605#9548
20M → 21M7092-22#9548#9570
21M → 35K3171-40#9570#9610
35K → 23M9899-1#9610#9611
23M → 24M4886-38#9611#9649
24M → 40K66*51+15#9649#9634
40K → 25.2M4536+9#9634#9625
25.2M → Finish9927+72#9625#9553
TOTALS2630*1236+1394

* 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