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BOSTON MARATHON 2025

David Lam

Bib: 6435•M

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 22%
Gender (Male)
#0 / 16105
Top 34%
Masters (Masters Men)
#0 / 10463
Top 20%
Division (M40-44)
#0 / 2247
Top 46%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:53
Rank: #5635
Start → 5K
20:53 | 6:43/mi
10K· 6.21 mi
41:55
Rank: #5790 (-155)
5K → 10K
21:02 | 6:46/mi
15K· 9.32 mi
1:03:05
Rank: #5900 (-110)
10K → 15K
21:10 | 6:49/mi
20K· 12.43 mi
1:24:17
Rank: #5786 (+114)
15K → 20K
21:12 | 6:49/mi
Half· 13.11 mi
1:28:53
Rank: #5771 (+15)
20K → Half
4:36 | 6:45/mi
25K· 15.53 mi
1:45:37
Rank: #5706 (+65)
Half → 25K
16:44 | 6:54/mi
30K· 18.64 mi
2:08:16
Rank: #5822 (-116)
25K → 30K
22:39 | 7:17/mi
20M
2:19:06
Rank: #6096 (-274)
30K → 20M
10:50 | 7:58/mi
21M
2:27:14
Rank: #6155 (-59)
20M → 21M
8:08 | 8:08/mi
35K· 21.75 mi
2:32:53
Rank: #6202 (-47)
21M → 35K
5:39 | 7:33/mi
23M
2:42:36
Rank: #6236 (-34)
35K → 23M
9:43 | 7:46/mi
24M
2:50:03
Rank: #6223 (+13)
23M → 24M
7:27 | 7:27/mi
40K· 24.85 mi
2:56:38
Rank: #6229 (-6)
24M → 40K
6:35 | 7:42/mi
25.2M
2:59:51
Rank: #6317 (-88)
40K → 25.2M
3:13 | 9:20/mi
Finish· 26.22 mi
3:06:36
Rank: #6151 (+166)
25.2M → Finish
6:45 | 6:37/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:28:53
Pace6:47 /mi
2nd Half
Distance13.11 mi
Time1:37:43
Pace7:27 /mi
📊Positive Split: 9.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:26:3220:536:4320:53
6:43
-
10K
6.21 mi10:47:3441:556:4521:02
6:46
+0:03
15K
9.32 mi11:08:441:03:056:4621:10
6:49
+0:03
20K
12.43 mi11:29:561:24:176:4721:12
6:49
0:00
Half
13.11 mi11:34:321:28:536:474:36
6:45
-0:04
25K
15.53 mi11:51:161:45:376:4816:44
6:54
+0:09
30K
18.64 mi12:13:552:08:166:5322:39
7:17
+0:23
20M
20.00 mi12:24:452:19:066:5710:50
7:58
+0:41
21M
21.00 mi12:32:532:27:147:018:08
8:08
+0:10
35K
21.75 mi12:38:322:32:537:025:39
7:33
-0:35
23M
23.00 mi12:48:152:42:367:049:43
7:46
+0:13
24M
24.00 mi12:55:422:50:037:057:27
7:27
-0:19
40K
24.85 mi13:02:172:56:387:066:35
7:42
+0:15
25.2M
25.20 mi13:05:302:59:517:083:13
9:20
+1:38
Finish
26.22 mi13:12:153:06:367:076:45
6:37
-2:43

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

6:37 /mi

Average Pace

7:07 /mi

Slowest Pace

9:20 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:52:22

60% of race

Time at Steady Pace

35:45

19% of race

Time at Slower Pace

38:29

21% of race

Average Pace: 7:07 /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 mi10:26:3220:536:4320:53
6:43
#5635
10K
6.21 mi10:47:3441:556:4521:02
6:46
#5790
15K
9.32 mi11:08:441:03:056:4621:10
6:49
#5900
20K
12.43 mi11:29:561:24:176:4721:12
6:49
#5786
Half
13.11 mi11:34:321:28:536:474:36
6:45
#5771
25K
15.53 mi11:51:161:45:376:4816:44
6:54
#5706
30K
18.64 mi12:13:552:08:166:5322:39
7:17
#5822
20M
20.00 mi12:24:452:19:066:5710:50
7:58
#6096
21M
21.00 mi12:32:532:27:147:018:08
8:08
#6155
35K
21.75 mi12:38:322:32:537:025:39
7:33
#6202
23M
23.00 mi12:48:152:42:367:049:43
7:46
#6236
24M
24.00 mi12:55:422:50:037:057:27
7:27
#6223
40K
24.85 mi13:02:172:56:387:066:35
7:42
#6229
25.2M
25.20 mi13:05:302:59:517:083:13
9:20
#6317
Finish
26.22 mi13:12:153:06:367:076:45
6:37
#6151
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi5635521152116195(Top 22%)5616(Top 35%)5616(Top 250%)
10K6.21 mi3.10 mi5790-1555336-1255336-1256041(Top 21%)5518(Top 34%)5518(Top 246%)
15K9.32 mi3.11 mi5900-1105412-765412-766195(Top 22%)5616(Top 35%)5616(Top 250%)
20K12.43 mi3.11 mi5786+1145310+1025310+1025528(Top 19%)5045(Top 31%)5045(Top 225%)
Half13.11 mi0.68 mi5771+155295+155295+155606(Top 20%)5126(Top 32%)5126(Top 228%)
25K15.53 mi2.42 mi5706+655227+685227+685678(Top 20%)5140(Top 32%)5140(Top 229%)
30K18.64 mi3.11 mi5822-1165297-705297-706387(Top 22%)5578(Top 35%)5578(Top 248%)
20M20.00 mi1.36 mi6096-2745495-1985495-19810222(Top 36%)7640(Top 47%)7640(Top 340%)
21M21.00 mi1.00 mi6155-595528-335528-338119(Top 29%)6312(Top 39%)6312(Top 281%)
35K21.75 mi0.75 mi6202-475557-295557-298937(Top 31%)6799(Top 42%)6799(Top 303%)
23M23.00 mi1.25 mi6236-345556+15556+18271(Top 29%)6306(Top 39%)6306(Top 281%)
24M24.00 mi1.00 mi6223+135533+235533+237325(Top 26%)5712(Top 35%)5712(Top 254%)
40K24.85 mi0.85 mi6229-65512+215512+218034(Top 28%)5996(Top 37%)5996(Top 267%)
25.2M25.20 mi0.35 mi6317-885561-495561-4913493(Top 48%)8663(Top 54%)8663(Top 386%)
Finish26.22 mi1.02 mi6151+1665426+1355426+1353461(Top 12%)3030(Top 19%)3030(Top 135%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 22%
×21stories
+97ft-345ft

Overall

6195

Males

5616

M40-44

5616

5K→10K

3.1 - 6.2 mi

Top 21%
×5stories
+79ft-138ft

Overall

6041

Males

5518

M40-44

5518

10K→15K

6.2 - 9.3 mi

Top 22%
×3stories
+67ft-78ft

Overall

6195

Males

5616

M40-44

5616

15K→20K

9.3 - 12.4 mi

Top 19%
×5stories
+106ft-86ft

Overall

5528

Males

5045

M40-44

5045

20K→Half

12.4 - 13.1 mi

Top 20%
×2stories
+19ft-37ft

Overall

5606

Males

5126

M40-44

5126

Half→25K

13.1 - 15.5 mi

Top 20%
×4stories
+66ft-88ft

Overall

5678

Males

5140

M40-44

5140

25K→30K

15.5 - 18.6 mi

Top 22%
×9stories
+181ft-148ft

Overall

6387

Males

5578

M40-44

5578

30K→20M

18.6 - 20.0 mi

Top 36%
×5stories
+64ft-50ft

Overall

10222

Males

7640

M40-44

7640

20M→21M

20.0 - 21.0 mi

Top 29%
×8stories
+106ft-24ft

Overall

8119

Males

6312

M40-44

6312

21M→35K

21.0 - 21.8 mi

Top 31%
×7stories
+17ft-86ft

Overall

8937

Males

6799

M40-44

6799

35K→23M

21.8 - 23.0 mi

Top 29%
×5stories
+23ft-63ft

Overall

8271

Males

6306

M40-44

6306

23M→24M

23.0 - 24.0 mi

Top 26%
×6stories
+12ft-82ft

Overall

7325

Males

5712

M40-44

5712

24M→40K

24.0 - 24.9 mi

Top 28%
×1story
+6ft-20ft

Overall

8034

Males

5996

M40-44

5996

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

13493

Males

8663

M40-44

8663

25.2M→Finish

25.2 - 26.2 mi

Top 12%
×2stories
+22ft-21ft

Overall

3461

Males

3030

M40-44

3030

Passing Analysis

Category:
Athletes Passed
1184
Passed By
1700
Net Change
-516
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5635
5K → 10K114269-155#5635#5790
10K → 15K93203-110#5790#5900
15K → 20K18369+114#5900#5786
20K → Half3015+15#5786#5771
Half → 25K14782+65#5771#5706
25K → 30K152268-116#5706#5822
30K → 20M17291-274#5822#6096
20M → 21M53112-59#6096#6155
21M → 35K2875-47#6155#6202
35K → 23M67101-34#6202#6236
23M → 24M6653+13#6236#6223
24M → 40K5561-6#6223#6229
40K → 25.2M997-88#6229#6317
25.2M → Finish1704+166#6317#6151
TOTALS11841700-516
📊

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