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BOSTON MARATHON 2025

Brian Kosmac

Bib: 7957•M

OH

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 49%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M40-44)
#0 / 2247
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:51
Rank: #13746
Start → 5K
23:51 | 7:41/mi
10K· 6.21 mi
47:45
Rank: #13786 (-40)
5K → 10K
23:54 | 7:42/mi
15K· 9.32 mi
1:12:19
Rank: #14278 (-492)
10K → 15K
24:34 | 7:54/mi
20K· 12.43 mi
1:37:26
Rank: #14580 (-302)
15K → 20K
25:07 | 8:05/mi
Half· 13.11 mi
1:42:45
Rank: #14556 (+24)
20K → Half
5:19 | 7:48/mi
25K· 15.53 mi
2:02:19
Rank: #14503 (+53)
Half → 25K
19:34 | 8:04/mi
30K· 18.64 mi
2:28:08
Rank: #14248 (+255)
25K → 30K
25:49 | 8:19/mi
20M
2:39:38
Rank: #14164 (+84)
30K → 20M
11:30 | 8:28/mi
21M
2:48:50
Rank: #14176 (-12)
20M → 21M
9:12 | 9:12/mi
35K· 21.75 mi
2:54:49
Rank: #14075 (+101)
21M → 35K
5:59 | 8:00/mi
23M
3:05:35
Rank: #14094 (-19)
35K → 23M
10:46 | 8:36/mi
24M
3:13:54
Rank: #14052 (+42)
23M → 24M
8:19 | 8:19/mi
40K· 24.85 mi
3:21:17
Rank: #14033 (+19)
24M → 40K
7:23 | 8:38/mi
25.2M
3:24:32
Rank: #14019 (+14)
40K → 25.2M
3:15 | 9:25/mi
Finish· 26.22 mi
3:32:41
Rank: #13941 (+78)
25.2M → Finish
8:09 | 8:00/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:42:45
Pace7:50 /mi
2nd Half
Distance13.11 mi
Time1:49:56
Pace8:23 /mi
📊Positive Split: 7.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:32:4623:517:4123:51
7:41
-
10K
6.21 mi10:56:4047:457:4123:54
7:42
+0:01
15K
9.32 mi11:21:141:12:197:4624:34
7:54
+0:12
20K
12.43 mi11:46:211:37:267:5025:07
8:05
+0:11
Half
13.11 mi11:51:401:42:457:505:19
7:48
-0:17
25K
15.53 mi12:11:142:02:197:5219:34
8:04
+0:16
30K
18.64 mi12:37:032:28:087:5725:49
8:19
+0:15
20M
20.00 mi12:48:332:39:387:5911:30
8:28
+0:09
21M
21.00 mi12:57:452:48:508:029:12
9:12
+0:44
35K
21.75 mi13:03:442:54:498:025:59
8:00
-1:12
23M
23.00 mi13:14:303:05:358:0410:46
8:36
+0:36
24M
24.00 mi13:22:493:13:548:058:19
8:19
-0:17
40K
24.85 mi13:30:123:21:178:067:23
8:38
+0:19
25.2M
25.20 mi13:33:273:24:328:073:15
9:25
+0:47
Finish
26.22 mi13:41:363:32:418:078:09
8:00
-1:25

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

7:41 /mi

Average Pace

8:07 /mi

Slowest Pace

9:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

53:04

25% of race

Time at Steady Pace

1:57:31

55% of race

Time at Slower Pace

42:06

20% of race

Average Pace: 8:07 /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 mi10:32:4623:517:4123:51
7:41
#13746
10K
6.21 mi10:56:4047:457:4123:54
7:42
#13786
15K
9.32 mi11:21:141:12:197:4624:34
7:54
#14278
20K
12.43 mi11:46:211:37:267:5025:07
8:05
#14580
Half
13.11 mi11:51:401:42:457:505:19
7:48
#14556
25K
15.53 mi12:11:142:02:197:5219:34
8:04
#14503
30K
18.64 mi12:37:032:28:087:5725:49
8:19
#14248
20M
20.00 mi12:48:332:39:387:5911:30
8:28
#14164
21M
21.00 mi12:57:452:48:508:029:12
9:12
#14176
35K
21.75 mi13:03:442:54:498:025:59
8:00
#14075
23M
23.00 mi13:14:303:05:358:0410:46
8:36
#14094
24M
24.00 mi13:22:493:13:548:058:19
8:19
#14052
40K
24.85 mi13:30:123:21:178:067:23
8:38
#14033
25.2M
25.20 mi13:33:273:24:328:073:15
9:25
#14019
Finish
26.22 mi13:41:363:32:418:078:09
8:00
#13941
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi137469968996815278(Top 54%)10492(Top 65%)10492(Top 467%)
10K6.21 mi3.10 mi13786-409929+399929+3913816(Top 49%)9928(Top 62%)9928(Top 442%)
15K9.32 mi3.11 mi14278-49210109-18010109-18015278(Top 54%)10492(Top 65%)10492(Top 467%)
20K12.43 mi3.11 mi14580-30210204-9510204-9515513(Top 55%)10548(Top 65%)10548(Top 469%)
Half13.11 mi0.68 mi14556+2410194+1010194+1014161(Top 50%)9973(Top 62%)9973(Top 444%)
25K15.53 mi2.42 mi14503+5310120+7410120+7414411(Top 51%)9934(Top 62%)9934(Top 442%)
30K18.64 mi3.11 mi14248+2559958+1629958+16213564(Top 48%)9402(Top 58%)9402(Top 418%)
20M20.00 mi1.36 mi14164+849899+599899+5913529(Top 48%)9231(Top 57%)9231(Top 411%)
21M21.00 mi1.00 mi14176-129874+259874+2514603(Top 51%)9614(Top 60%)9614(Top 428%)
35K21.75 mi0.75 mi14075+1019806+689806+6812242(Top 43%)8447(Top 52%)8447(Top 376%)
23M23.00 mi1.25 mi14094-199774+329774+3213905(Top 49%)9120(Top 57%)9120(Top 406%)
24M24.00 mi1.00 mi14052+429718+569718+5613346(Top 47%)8823(Top 55%)8823(Top 393%)
40K24.85 mi0.85 mi14033+199699+199699+1914245(Top 50%)9110(Top 57%)9110(Top 405%)
25.2M25.20 mi0.35 mi14019+149682+179682+1714098(Top 50%)8983(Top 56%)8983(Top 400%)
Finish26.22 mi1.02 mi13941+789616+669616+6612850(Top 45%)8463(Top 53%)8463(Top 377%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 54%
×21stories
+97ft-345ft

Overall

15278

Males

10492

M40-44

10492

5K→10K

3.1 - 6.2 mi

Top 49%
×5stories
+79ft-138ft

Overall

13816

Males

9928

M40-44

9928

10K→15K

6.2 - 9.3 mi

Top 54%
×3stories
+67ft-78ft

Overall

15278

Males

10492

M40-44

10492

15K→20K

9.3 - 12.4 mi

Top 55%
×5stories
+106ft-86ft

Overall

15513

Males

10548

M40-44

10548

20K→Half

12.4 - 13.1 mi

Top 50%
×2stories
+19ft-37ft

Overall

14161

Males

9973

M40-44

9973

Half→25K

13.1 - 15.5 mi

Top 51%
×4stories
+66ft-88ft

Overall

14411

Males

9934

M40-44

9934

25K→30K

15.5 - 18.6 mi

Top 48%
×9stories
+181ft-148ft

Overall

13564

Males

9402

M40-44

9402

30K→20M

18.6 - 20.0 mi

Top 48%
×5stories
+64ft-50ft

Overall

13529

Males

9231

M40-44

9231

20M→21M

20.0 - 21.0 mi

Top 51%
×8stories
+106ft-24ft

Overall

14603

Males

9614

M40-44

9614

21M→35K

21.0 - 21.8 mi

Top 43%
×7stories
+17ft-86ft

Overall

12242

Males

8447

M40-44

8447

35K→23M

21.8 - 23.0 mi

Top 49%
×5stories
+23ft-63ft

Overall

13905

Males

9120

M40-44

9120

23M→24M

23.0 - 24.0 mi

Top 47%
×6stories
+12ft-82ft

Overall

13346

Males

8823

M40-44

8823

24M→40K

24.0 - 24.9 mi

Top 50%
×1story
+6ft-20ft

Overall

14245

Males

9110

M40-44

9110

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

14098

Males

8983

M40-44

8983

25.2M→Finish

25.2 - 26.2 mi

Top 45%
×2stories
+22ft-21ft

Overall

12850

Males

8463

M40-44

8463

Passing Analysis

Category:
Athletes Passed
1923
Passed By
2118
Net Change
-195
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13746
5K → 10K268308-40#13746#13786
10K → 15K71563-492#13786#14278
15K → 20K123425-302#14278#14580
20K → Half4925+24#14580#14556
Half → 25K201148+53#14556#14503
25K → 30K377122+255#14503#14248
30K → 20M14864+84#14248#14164
20M → 21M114126-12#14164#14176
21M → 35K11918+101#14176#14075
35K → 23M107126-19#14075#14094
23M → 24M10866+42#14094#14052
24M → 40K7960+19#14052#14033
40K → 25.2M4228+14#14033#14019
25.2M → Finish11739+78#14019#13941
TOTALS19232118-195
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing