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BOSTON MARATHON 2026

Brian Claflin

Bib: 27580•M

MA

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0:00
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Overall
#0 / 29021
Top 45%
Gender (Male)
#0 / 16340
Age Group (M18-39)
#0 / 5723
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
22:32
3.11 mi
Rank: #10642
Start → 5K
22:32 | 7:16/mi
10K
44:44
6.21 mi
Rank: #10187 (+455)
5K → 10K
22:12 | 7:09/mi
15K
1:07:05
9.32 mi
Rank: #10120 (+67)
10K → 15K
22:21 | 7:12/mi
20K
1:29:57
12.43 mi
Rank: #10246 (-126)
15K → 20K
22:52 | 7:22/mi
HALF
1:34:58
13.11 mi
Rank: #10314 (-68)
20K → HALF
5:01 | 7:22/mi
25K
1:55:14
15.53 mi
Rank: #11711 (-1397)
HALF → 25K
20:16 | 8:22/mi
30K
2:19:09
18.64 mi
Rank: #11589 (+122)
25K → 30K
23:55 | 7:42/mi
20M
2:29:55
20.00 mi
Rank: #11612 (-23)
30K → 20M
10:46 | 7:56/mi
21M
2:38:35
21.00 mi
Rank: #11754 (-142)
20M → 21M
8:40 | 8:40/mi
35K
2:44:37
21.75 mi
Rank: #11862 (-108)
21M → 35K
6:02 | 8:04/mi
23M
2:55:36
23.00 mi
Rank: #12236 (-374)
35K → 23M
10:59 | 8:47/mi
24M
3:03:52
24.00 mi
Rank: #12368 (-132)
23M → 24M
8:16 | 8:16/mi
40K
3:11:33
24.85 mi
Rank: #12618 (-250)
24M → 40K
7:41 | 9:00/mi
25.2M
3:15:02
25.20 mi
Rank: #12748 (-130)
40K → 25.2M
3:29 | 10:07/mi
FINISH
3:23:35
26.22 mi
Rank: #12934 (-186)
25.2M → FINISH
8:33 | 8:24/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:34:58
Pace7:15 /mi
2nd Half
Distance13.11 mi
Time1:48:37
Pace8:18 /mi
📊Positive Split: 14.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:0122:327:1622:32
7:16
-
10K
6.21 mi12:08:1344:447:1222:12
7:09
-0:07
15K
9.32 mi12:30:341:07:057:1222:21
7:12
+0:03
20K
12.43 mi12:53:261:29:577:1522:52
7:22
+0:10
HALF
13.11 mi12:58:271:34:587:155:01
7:22
0:00
25K
15.53 mi13:18:431:55:147:2620:16
8:22
+1:00
30K
18.64 mi13:42:382:19:097:2823:55
7:42
-0:40
20M
20.00 mi13:53:242:29:557:3010:46
7:56
+0:14
21M
21.00 mi14:02:042:38:357:348:40
8:40
+0:44
35K
21.75 mi14:08:062:44:377:356:02
8:04
-0:36
23M
23.00 mi14:19:052:55:367:3910:59
8:47
+0:43
24M
24.00 mi14:27:213:03:527:408:16
8:16
-0:31
40K
24.85 mi14:35:023:11:337:437:41
9:00
+0:44
25.2M
25.20 mi14:38:313:15:027:453:29
10:07
+1:07
FINISH
26.22 mi14:47:043:23:357:478:33
8:24
-1:43

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

7:09 /mi

Average Pace

7:46 /mi

Slowest Pace

10:07 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

1:34:58

47% of race

Time at Steady Pace

1:17:48

38% of race

Time at Slower Pace

30:49

15% of race

Average Pace: 7:46 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:46:0122:327:1622:32
7:16
#10642
10K
6.21 mi12:08:1344:447:1222:12
7:09
#10187
15K
9.32 mi12:30:341:07:057:1222:21
7:12
#10120
20K
12.43 mi12:53:261:29:577:1522:52
7:22
#10246
HALF
13.11 mi12:58:271:34:587:155:01
7:22
#10314
25K
15.53 mi13:18:431:55:147:2620:16
8:22
#11711
30K
18.64 mi13:42:382:19:097:2823:55
7:42
#11589
20M
20.00 mi13:53:242:29:557:3010:46
7:56
#11612
21M
21.00 mi14:02:042:38:357:348:40
8:40
#11754
35K
21.75 mi14:08:062:44:377:356:02
8:04
#11862
23M
23.00 mi14:19:052:55:367:3910:59
8:47
#12236
24M
24.00 mi14:27:213:03:527:408:16
8:16
#12368
40K
24.85 mi14:35:023:11:337:437:41
9:00
#12618
25.2M
25.20 mi14:38:313:15:027:453:29
10:07
#12748
FINISH
26.22 mi14:47:043:23:357:478:33
8:24
#12934
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi106428404840410065(Top 35%)8057(Top 49%)8057(Top 141%)
10K6.21 mi3.10 mi10187+4558169+2358169+2359757(Top 34%)7943(Top 49%)7943(Top 139%)
15K9.32 mi3.11 mi10120+678122+478122+4710065(Top 35%)8057(Top 49%)8057(Top 141%)
20K12.43 mi3.11 mi10246-1268141-198141-1910741(Top 37%)8279(Top 51%)8279(Top 145%)
HALF13.11 mi0.68 mi10314-688169-288169-2811691(Top 40%)8811(Top 54%)8811(Top 154%)
25K15.53 mi2.42 mi11711-13978794-6258794-62517703(Top 61%)11231(Top 69%)11231(Top 196%)
30K18.64 mi3.11 mi11589+1228695+998695+9911211(Top 39%)8299(Top 51%)8299(Top 145%)
20M20.00 mi1.36 mi11612-238695869512287(Top 42%)8696(Top 53%)8696(Top 152%)
21M21.00 mi1.00 mi11754-1428730-358730-3514148(Top 49%)9429(Top 58%)9429(Top 165%)
35K21.75 mi0.75 mi11862-1088765-358765-3514876(Top 51%)9690(Top 59%)9690(Top 169%)
23M23.00 mi1.25 mi12236-3748889-1248889-12417302(Top 60%)10649(Top 65%)10649(Top 186%)
24M24.00 mi1.00 mi12368-1328919-308919-3015450(Top 53%)9809(Top 60%)9809(Top 171%)
40K24.85 mi0.85 mi12618-2509013-949013-9418294(Top 63%)11020(Top 67%)11020(Top 193%)
25.2M25.20 mi0.35 mi12748-1309059-469059-4619686(Top 68%)11684(Top 72%)11684(Top 204%)
FINISH26.22 mi1.02 mi12934-1869108-499108-4917530(Top 60%)10660(Top 65%)10660(Top 186%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 35%
×21
+97ft-345ft

Overall

10065

Males

8057

M18-39

8057

5K→10K

3.1 - 6.2 mi

Top 34%
×5
+79ft-138ft

Overall

9757

Males

7943

M18-39

7943

10K→15K

6.2 - 9.3 mi

Top 35%
×3
+67ft-78ft

Overall

10065

Males

8057

M18-39

8057

15K→20K

9.3 - 12.4 mi

Top 37%
×5
+106ft-86ft

Overall

10741

Males

8279

M18-39

8279

20K→HALF

12.4 - 13.1 mi

Top 40%
×2
+19ft-37ft

Overall

11691

Males

8811

M18-39

8811

HALF→25K

13.1 - 15.5 mi

Top 61%
×4
+66ft-88ft

Overall

17703

Males

11231

M18-39

11231

25K→30K

15.5 - 18.6 mi

Top 39%
×9
+181ft-148ft

Overall

11211

Males

8299

M18-39

8299

30K→20M

18.6 - 20.0 mi

Top 42%
×5
+64ft-50ft

Overall

12287

Males

8696

M18-39

8696

20M→21M

20.0 - 21.0 mi

Top 49%
×8
+106ft-24ft

Overall

14148

Males

9429

M18-39

9429

21M→35K

21.0 - 21.8 mi

Top 51%
×7
+17ft-86ft

Overall

14876

Males

9690

M18-39

9690

35K→23M

21.8 - 23.0 mi

Top 60%
×5
+23ft-63ft

Overall

17302

Males

10649

M18-39

10649

23M→24M

23.0 - 24.0 mi

Top 53%
×6
+12ft-82ft

Overall

15450

Males

9809

M18-39

9809

24M→40K

24.0 - 24.9 mi

Top 63%
×1
+6ft-20ft

Overall

18294

Males

11020

M18-39

11020

40K→25.2M

24.9 - 25.2 mi

Top 68%
×1
+13ft-16ft

Overall

19686

Males

11684

M18-39

11684

25.2M→FINISH

25.2 - 26.2 mi

Top 60%
×2
+22ft-21ft

Overall

17530

Males

10660

M18-39

10660

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
1444
Passed By
3735
Net Change
-2292
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10642
5K → 10K52367+455#10642#10187
10K → 15K205138+67#10187#10120
15K → 20K125251-126#10120#10246
20K → HALF1078-68#10246#10314
HALF → 25K131410-1397#10314#11711
25K → 30K253131+122#11711#11589
30K → 20M81104-23#11589#11612
20M → 21M45187-142#11612#11754
21M → 35K35143-108#11754#11862
35K → 23M39413-374#11862#12236
23M → 24M46178-132#12236#12368
24M → 40K22272-250#12368#12618
40K → 25.2M8138-130#12618#12748
25.2M → FINISH39225-186#12748#12934
TOTALS14443735-2292
📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Qualifying & Age Grade

See how your performance stacks up against qualifying standards

OTQ

Olympic Trials Qualifying analysis available

Activity Data

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Export & Support

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing