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BOSTON MARATHON 2025

Yanlai Chen

Bib: 9650•M

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 38%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Top 40%
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:39
Rank: #10258
Start → 5K
22:39 | 7:17/mi
10K· 6.21 mi
44:34
Rank: #9211 (+1047)
5K → 10K
21:55 | 7:03/mi
15K· 9.32 mi
1:07:06
Rank: #9330 (-119)
10K → 15K
22:32 | 7:15/mi
20K· 12.43 mi
1:30:41
Rank: #9851 (-521)
15K → 20K
23:35 | 7:35/mi
Half· 13.11 mi
1:35:42
Rank: #9875 (-24)
20K → Half
5:01 | 7:21/mi
25K· 15.53 mi
1:54:17
Rank: #10069 (-194)
Half → 25K
18:35 | 7:40/mi
30K· 18.64 mi
2:18:42
Rank: #10057 (+12)
25K → 30K
24:25 | 7:52/mi
20M
2:29:43
Rank: #10108 (-51)
30K → 20M
11:01 | 8:06/mi
21M
2:38:43
Rank: #10304 (-196)
20M → 21M
9:00 | 9:00/mi
35K· 21.75 mi
2:44:21
Rank: #10237 (+67)
21M → 35K
5:38 | 7:32/mi
23M
2:54:37
Rank: #10284 (-47)
35K → 23M
10:16 | 8:12/mi
24M
3:02:52
Rank: #10396 (-112)
23M → 24M
8:15 | 8:15/mi
40K· 24.85 mi
3:10:23
Rank: #10557 (-161)
24M → 40K
7:31 | 8:47/mi
25.2M
3:13:35
Rank: #10586 (-29)
40K → 25.2M
3:12 | 9:17/mi
Finish· 26.22 mi
3:22:00
Rank: #10724 (-138)
25.2M → Finish
8:25 | 8:16/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:35:42
Pace7:18 /mi
2nd Half
Distance13.11 mi
Time1:46:18
Pace8:07 /mi
📊Positive Split: 11.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:0722:397:1722:39
7:17
-
10K
6.21 mi11:11:0244:347:1021:55
7:03
-0:14
15K
9.32 mi11:33:341:07:067:1222:32
7:15
+0:12
20K
12.43 mi11:57:091:30:417:1823:35
7:35
+0:20
Half
13.11 mi12:02:101:35:427:185:01
7:21
-0:14
25K
15.53 mi12:20:451:54:177:2118:35
7:40
+0:19
30K
18.64 mi12:45:102:18:427:2624:25
7:52
+0:12
20M
20.00 mi12:56:112:29:437:2911:01
8:06
+0:14
21M
21.00 mi13:05:112:38:437:339:00
9:00
+0:54
35K
21.75 mi13:10:492:44:217:335:38
7:32
-1:28
23M
23.00 mi13:21:052:54:377:3610:16
8:12
+0:40
24M
24.00 mi13:29:203:02:527:378:15
8:15
+0:03
40K
24.85 mi13:36:513:10:237:407:31
8:47
+0:32
25.2M
25.20 mi13:40:033:13:357:413:12
9:17
+0:30
Finish
26.22 mi13:48:283:22:007:438:25
8:16
-1:01

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

7:03 /mi

Average Pace

7:43 /mi

Slowest Pace

9:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:17:45

38% of race

Time at Steady Pace

1:17:36

38% of race

Time at Slower Pace

46:39

23% of race

Average Pace: 7:42 /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 mi10:49:0722:397:1722:39
7:17
#10258
10K
6.21 mi11:11:0244:347:1021:55
7:03
#9211
15K
9.32 mi11:33:341:07:067:1222:32
7:15
#9330
20K
12.43 mi11:57:091:30:417:1823:35
7:35
#9851
Half
13.11 mi12:02:101:35:427:185:01
7:21
#9875
25K
15.53 mi12:20:451:54:177:2118:35
7:40
#10069
30K
18.64 mi12:45:102:18:427:2624:25
7:52
#10057
20M
20.00 mi12:56:112:29:437:2911:01
8:06
#10108
21M
21.00 mi13:05:112:38:437:339:00
9:00
#10304
35K
21.75 mi13:10:492:44:217:335:38
7:32
#10237
23M
23.00 mi13:21:052:54:377:3610:16
8:12
#10284
24M
24.00 mi13:29:203:02:527:378:15
8:15
#10396
40K
24.85 mi13:36:513:10:237:407:31
8:47
#10557
25.2M
25.20 mi13:40:033:13:357:413:12
9:17
#10586
Finish
26.22 mi13:48:283:22:007:438:25
8:16
#10724
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi10258830583059573(Top 34%)7860(Top 49%)7860(Top 329%)
10K6.21 mi3.10 mi9211+10477727+5787727+5788326(Top 29%)7189(Top 45%)7189(Top 301%)
15K9.32 mi3.11 mi9330-1197771-447771-449573(Top 34%)7860(Top 49%)7860(Top 329%)
20K12.43 mi3.11 mi9851-5218027-2568027-25611502(Top 40%)8732(Top 54%)8732(Top 366%)
Half13.11 mi0.68 mi9875-248040-138040-1310449(Top 37%)8262(Top 51%)8262(Top 346%)
25K15.53 mi2.42 mi10069-1948098-588098-5811246(Top 40%)8501(Top 53%)8501(Top 356%)
30K18.64 mi3.11 mi10057+128049+498049+4910340(Top 36%)7858(Top 49%)7858(Top 329%)
20M20.00 mi1.36 mi10108-518042+78042+711131(Top 39%)8093(Top 50%)8093(Top 339%)
21M21.00 mi1.00 mi10304-1968085-438085-4313464(Top 47%)9078(Top 56%)9078(Top 380%)
35K21.75 mi0.75 mi10237+678035+508035+508840(Top 31%)6771(Top 42%)6771(Top 284%)
23M23.00 mi1.25 mi10284-478001+348001+3411344(Top 40%)7911(Top 49%)7911(Top 332%)
24M24.00 mi1.00 mi10396-1128038-378038-3712883(Top 45%)8587(Top 53%)8587(Top 360%)
40K24.85 mi0.85 mi10557-1618087-498087-4915102(Top 53%)9478(Top 59%)9478(Top 397%)
25.2M25.20 mi0.35 mi10586-298080+78080+713279(Top 47%)8585(Top 53%)8585(Top 360%)
Finish26.22 mi1.02 mi10724-1388108-288108-2814639(Top 52%)9311(Top 58%)9311(Top 390%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 34%
×21stories
+97ft-345ft

Overall

9573

Males

7860

M45-49

7860

5K→10K

3.1 - 6.2 mi

Top 29%
×5stories
+79ft-138ft

Overall

8326

Males

7189

M45-49

7189

10K→15K

6.2 - 9.3 mi

Top 34%
×3stories
+67ft-78ft

Overall

9573

Males

7860

M45-49

7860

15K→20K

9.3 - 12.4 mi

Top 40%
×5stories
+106ft-86ft

Overall

11502

Males

8732

M45-49

8732

20K→Half

12.4 - 13.1 mi

Top 37%
×2stories
+19ft-37ft

Overall

10449

Males

8262

M45-49

8262

Half→25K

13.1 - 15.5 mi

Top 40%
×4stories
+66ft-88ft

Overall

11246

Males

8501

M45-49

8501

25K→30K

15.5 - 18.6 mi

Top 36%
×9stories
+181ft-148ft

Overall

10340

Males

7858

M45-49

7858

30K→20M

18.6 - 20.0 mi

Top 39%
×5stories
+64ft-50ft

Overall

11131

Males

8093

M45-49

8093

20M→21M

20.0 - 21.0 mi

Top 47%
×8stories
+106ft-24ft

Overall

13464

Males

9078

M45-49

9078

21M→35K

21.0 - 21.8 mi

Top 31%
×7stories
+17ft-86ft

Overall

8840

Males

6771

M45-49

6771

35K→23M

21.8 - 23.0 mi

Top 40%
×5stories
+23ft-63ft

Overall

11344

Males

7911

M45-49

7911

23M→24M

23.0 - 24.0 mi

Top 45%
×6stories
+12ft-82ft

Overall

12883

Males

8587

M45-49

8587

24M→40K

24.0 - 24.9 mi

Top 53%
×1story
+6ft-20ft

Overall

15102

Males

9478

M45-49

9478

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13279

Males

8585

M45-49

8585

25.2M→Finish

25.2 - 26.2 mi

Top 52%
×2stories
+22ft-21ft

Overall

14639

Males

9311

M45-49

9311

Passing Analysis

Category:
Athletes Passed
2120*
Passed By
2581
Net Change
-466
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10258
5K → 10K1066*19+1047#10258#9211
10K → 15K116235-119#9211#9330
15K → 20K79600-521#9330#9851
20K → Half2347-24#9851#9875
Half → 25K100292-194#9875#10069
25K → 30K240227+12#10069#10057
30K → 20M111161-51#10057#10108
20M → 21M50245-196#10108#10304
21M → 35K9023+67#10304#10237
35K → 23M100147-47#10237#10284
23M → 24M46158-112#10284#10396
24M → 40K31192-161#10396#10557
40K → 25.2M3564-29#10557#10586
25.2M → Finish33171-138#10586#10724
TOTALS2120*2581-466

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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