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BOSTON MARATHON 2025

Dongchen Li

Bib: 7366•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 27%
Gender (Male)
#0 / 16105
Top 40%
Masters (Masters Men)
#0 / 10463
Top 27%
Division (M45-49)
#0 / 2386
Top 39%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:26
Rank: #2183
Start → 5K
19:26 | 6:15/mi
10K· 6.21 mi
40:23
Rank: #3775 (-1592)
5K → 10K
20:57 | 6:45/mi
15K· 9.32 mi
1:01:16
Rank: #4203 (-428)
10K → 15K
20:53 | 6:43/mi
20K· 12.43 mi
1:23:31
Rank: #5172 (-969)
15K → 20K
22:15 | 7:10/mi
Half· 13.11 mi
1:28:19
Rank: #5344 (-172)
20K → Half
4:48 | 7:02/mi
25K· 15.53 mi
1:46:27
Rank: #6186 (-842)
Half → 25K
18:08 | 7:29/mi
30K· 18.64 mi
2:10:42
Rank: #6742 (-556)
25K → 30K
24:15 | 7:48/mi
20M
2:21:30
Rank: #6870 (-128)
30K → 20M
10:48 | 7:57/mi
21M
2:30:11
Rank: #7070 (-200)
20M → 21M
8:41 | 8:41/mi
35K· 21.75 mi
2:36:09
Rank: #7191 (-121)
21M → 35K
5:58 | 7:59/mi
23M
2:46:12
Rank: #7291 (-100)
35K → 23M
10:03 | 8:02/mi
24M
2:54:01
Rank: #7361 (-70)
23M → 24M
7:49 | 7:49/mi
40K· 24.85 mi
3:00:54
Rank: #7418 (-57)
24M → 40K
6:53 | 8:03/mi
25.2M
3:04:03
Rank: #7495 (-77)
40K → 25.2M
3:09 | 9:08/mi
Finish· 26.22 mi
3:12:24
Rank: #7719 (-224)
25.2M → Finish
8:21 | 8:12/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:28:19
Pace6:44 /mi
2nd Half
Distance13.11 mi
Time1:44:05
Pace7:56 /mi
📊Positive Split: 17.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:25:1519:266:1519:26
6:15
-
10K
6.21 mi10:46:1240:236:3020:57
6:45
+0:30
15K
9.32 mi11:07:051:01:166:3420:53
6:43
-0:02
20K
12.43 mi11:29:201:23:316:4322:15
7:10
+0:27
Half
13.11 mi11:34:081:28:196:444:48
7:02
-0:08
25K
15.53 mi11:52:161:46:276:5118:08
7:29
+0:27
30K
18.64 mi12:16:312:10:427:0124:15
7:48
+0:19
20M
20.00 mi12:27:192:21:307:0410:48
7:57
+0:09
21M
21.00 mi12:36:002:30:117:098:41
8:41
+0:44
35K
21.75 mi12:41:582:36:097:115:58
7:59
-0:42
23M
23.00 mi12:52:012:46:127:1410:03
8:02
+0:03
24M
24.00 mi12:59:502:54:017:157:49
7:49
-0:13
40K
24.85 mi13:06:433:00:547:176:53
8:03
+0:14
25.2M
25.20 mi13:09:523:04:037:183:09
9:08
+1:05
Finish
26.22 mi13:18:133:12:247:218:21
8:12
-0:56

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

6:15 /mi

Average Pace

7:21 /mi

Slowest Pace

9:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:28:19

46% of race

Time at Steady Pace

1:23:54

44% of race

Time at Slower Pace

20:11

10% of race

Average Pace: 7:20 /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 mi10:25:1519:266:1519:26
6:15
#2183
10K
6.21 mi10:46:1240:236:3020:57
6:45
#3775
15K
9.32 mi11:07:051:01:166:3420:53
6:43
#4203
20K
12.43 mi11:29:201:23:316:4322:15
7:10
#5172
Half
13.11 mi11:34:081:28:196:444:48
7:02
#5344
25K
15.53 mi11:52:161:46:276:5118:08
7:29
#6186
30K
18.64 mi12:16:312:10:427:0124:15
7:48
#6742
20M
20.00 mi12:27:192:21:307:0410:48
7:57
#6870
21M
21.00 mi12:36:002:30:117:098:41
8:41
#7070
35K
21.75 mi12:41:582:36:097:115:58
7:59
#7191
23M
23.00 mi12:52:012:46:127:1410:03
8:02
#7291
24M
24.00 mi12:59:502:54:017:157:49
7:49
#7361
40K
24.85 mi13:06:433:00:547:176:53
8:03
#7418
25.2M
25.20 mi13:09:523:04:037:183:09
9:08
#7495
Finish
26.22 mi13:18:133:12:247:218:21
8:12
#7719
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi2183208420845300(Top 19%)4899(Top 30%)4899(Top 205%)
10K6.21 mi3.10 mi3775-15923575-14913575-14915778(Top 20%)5294(Top 33%)5294(Top 222%)
15K9.32 mi3.11 mi4203-4283958-3833958-3835300(Top 19%)4899(Top 30%)4899(Top 205%)
20K12.43 mi3.11 mi5172-9694796-8384796-8387898(Top 28%)6805(Top 42%)6805(Top 285%)
Half13.11 mi0.68 mi5344-1724944-1484944-1487799(Top 27%)6761(Top 42%)6761(Top 283%)
25K15.53 mi2.42 mi6186-8425605-6615605-6619764(Top 34%)7729(Top 48%)7729(Top 324%)
30K18.64 mi3.11 mi6742-5566014-4096014-4099962(Top 35%)7663(Top 48%)7663(Top 321%)
20M20.00 mi1.36 mi6870-1286087-736087-7310059(Top 35%)7569(Top 47%)7569(Top 317%)
21M21.00 mi1.00 mi7070-2006204-1176204-11711533(Top 41%)8126(Top 50%)8126(Top 341%)
35K21.75 mi0.75 mi7191-1216264-606264-6012051(Top 42%)8331(Top 52%)8331(Top 349%)
23M23.00 mi1.25 mi7291-1006284-206284-2010187(Top 36%)7320(Top 45%)7320(Top 307%)
24M24.00 mi1.00 mi7361-706298-146298-149890(Top 35%)7099(Top 44%)7099(Top 298%)
40K24.85 mi0.85 mi7418-576304-66304-610516(Top 37%)7301(Top 45%)7301(Top 306%)
25.2M25.20 mi0.35 mi7495-776335-316335-3112462(Top 44%)8191(Top 51%)8191(Top 343%)
Finish26.22 mi1.02 mi7719-2246456-1216456-12114186(Top 50%)9096(Top 56%)9096(Top 381%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 19%
×21stories
+97ft-345ft

Overall

5300

Males

4899

M45-49

4899

5K→10K

3.1 - 6.2 mi

Top 20%
×5stories
+79ft-138ft

Overall

5778

Males

5294

M45-49

5294

10K→15K

6.2 - 9.3 mi

Top 19%
×3stories
+67ft-78ft

Overall

5300

Males

4899

M45-49

4899

15K→20K

9.3 - 12.4 mi

Top 28%
×5stories
+106ft-86ft

Overall

7898

Males

6805

M45-49

6805

20K→Half

12.4 - 13.1 mi

Top 27%
×2stories
+19ft-37ft

Overall

7799

Males

6761

M45-49

6761

Half→25K

13.1 - 15.5 mi

Top 34%
×4stories
+66ft-88ft

Overall

9764

Males

7729

M45-49

7729

25K→30K

15.5 - 18.6 mi

Top 35%
×9stories
+181ft-148ft

Overall

9962

Males

7663

M45-49

7663

30K→20M

18.6 - 20.0 mi

Top 35%
×5stories
+64ft-50ft

Overall

10059

Males

7569

M45-49

7569

20M→21M

20.0 - 21.0 mi

Top 41%
×8stories
+106ft-24ft

Overall

11533

Males

8126

M45-49

8126

21M→35K

21.0 - 21.8 mi

Top 42%
×7stories
+17ft-86ft

Overall

12051

Males

8331

M45-49

8331

35K→23M

21.8 - 23.0 mi

Top 36%
×5stories
+23ft-63ft

Overall

10187

Males

7320

M45-49

7320

23M→24M

23.0 - 24.0 mi

Top 35%
×6stories
+12ft-82ft

Overall

9890

Males

7099

M45-49

7099

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

10516

Males

7301

M45-49

7301

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

12462

Males

8191

M45-49

8191

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2stories
+22ft-21ft

Overall

14186

Males

9096

M45-49

9096

Passing Analysis

Category:
Athletes Passed
443
Passed By
5979
Net Change
-5536
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2183
5K → 10K11593-1592#2183#3775
10K → 15K19447-428#3775#4203
15K → 20K13982-969#4203#5172
20K → Half5177-172#5172#5344
Half → 25K20862-842#5344#6186
25K → 30K64620-556#6186#6742
30K → 20M56184-128#6742#6870
20M → 21M47247-200#6870#7070
21M → 35K22143-121#7070#7191
35K → 23M59159-100#7191#7291
23M → 24M50120-70#7291#7361
24M → 40K58115-57#7361#7418
40K → 25.2M1289-77#7418#7495
25.2M → Finish17241-224#7495#7719
TOTALS4435979-5536
📊

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