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BOSTON MARATHON 2025

Shengqing Dai

Bib: 17906•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M55-59)
#0 / 1648
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:52/mi
24:26
↑ 97↓ 3451.5%
10K· 6.21 mi
8:09/mi
49:44
↑ 79↓ 1380.4%
15K· 9.32 mi
8:10/mi
1:15:05
↑ 67↓ 78
20K· 12.43 mi
8:11/mi
1:40:29
↑ 106↓ 860.1%
Half· 13.11 mi
8:21/mi
1:46:11
↑ 19↓ 370.5%
25K· 15.53 mi
8:30/mi
2:06:48
↑ 66↓ 880.2%
30K· 18.64 mi
8:39/mi
2:33:39
↑ 181↓ 1480.2%
20M
8:26/mi
2:45:06
↑ 64↓ 500.2%
21M
9:04/mi
2:54:10
↑ 106↓ 241.6%
35K· 21.75 mi
9:51/mi
3:01:32
↑ 17↓ 861.7%
23M
9:53/mi
3:13:55
↑ 23↓ 630.6%
24M
10:24/mi
3:24:19
↓ 821.3%
40K· 24.85 mi
9:46/mi
3:32:40
↓ 200.3%
25.2M
10:23/mi
3:36:15
↑ 13↓ 160.2%
Finish· 26.22 mi
8:21/mi
3:44:46
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:11
Pace8:06 /mi
2nd Half
Distance13.11 mi
Time1:58:35
Pace9:03 /mi
📊Positive Split: 11.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:3024:267:5224:26
7:52
-
10K
6.21 mi11:39:4849:448:0025:18
8:09
+0:17
15K
9.32 mi12:05:091:15:058:0325:21
8:10
+0:01
20K
12.43 mi12:30:331:40:298:0525:24
8:11
+0:01
Half
13.11 mi12:36:151:46:118:065:42
8:21
+0:10
25K
15.53 mi12:56:522:06:488:1020:37
8:30
+0:09
30K
18.64 mi13:23:432:33:398:1526:51
8:39
+0:09
20M
20.00 mi13:35:102:45:068:1511:27
8:26
-0:13
21M
21.00 mi13:44:142:54:108:189:04
9:04
+0:38
35K
21.75 mi13:51:363:01:328:217:22
9:51
+0:47
23M
23.00 mi14:03:593:13:558:2612:23
9:53
+0:02
24M
24.00 mi14:14:233:24:198:3110:24
10:24
+0:31
40K
24.85 mi14:22:443:32:408:338:21
9:46
-0:38
25.2M
25.20 mi14:26:193:36:158:353:35
10:23
+0:37
Finish
26.22 mi14:34:503:44:468:358:31
8:21
-2:02

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

7:52 /mi

Average Pace

8:35 /mi

Slowest Pace

10:24 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

24:26

11% of race

Time at Steady Pace

2:29:11

66% of race

Time at Slower Pace

51:09

23% of race

Average Pace: 8:34 /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 mi11:14:3024:267:5224:26
7:52
#15354
10K
6.21 mi11:39:4849:448:0025:18
8:09
#16539
15K
9.32 mi12:05:091:15:058:0325:21
8:10
#16740
20K
12.43 mi12:30:331:40:298:0525:24
8:11
#16565
Half
13.11 mi12:36:151:46:118:065:42
8:21
#16672
25K
15.53 mi12:56:522:06:488:1020:37
8:30
#16721
30K
18.64 mi13:23:432:33:398:1526:51
8:39
#16468
20M
20.00 mi13:35:102:45:068:1511:27
8:26
#16223
21M
21.00 mi13:44:142:54:108:189:04
9:04
#16038
35K
21.75 mi13:51:363:01:328:217:22
9:51
#16270
23M
23.00 mi14:03:593:13:558:2612:23
9:53
#16539
24M
24.00 mi14:14:233:24:198:3110:24
10:24
#16972
40K
24.85 mi14:22:443:32:408:338:21
9:46
#17118
25.2M
25.20 mi14:26:193:36:158:353:35
10:23
#17149
Finish
26.22 mi14:34:503:44:468:358:31
8:21
#17067
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi15354105521055217122(Top 60%)11264(Top 70%)11264(Top 683%)
10K6.21 mi3.10 mi16539-118511029-47711029-47717477(Top 62%)11437(Top 71%)11437(Top 694%)
15K9.32 mi3.11 mi16740-20111117-8811117-8817122(Top 60%)11264(Top 70%)11264(Top 683%)
20K12.43 mi3.11 mi16565+17511038+7911038+7916131(Top 57%)10791(Top 67%)10791(Top 655%)
Half13.11 mi0.68 mi16672-10711079-4111079-4118217(Top 64%)11699(Top 73%)11699(Top 710%)
25K15.53 mi2.42 mi16721-4911075+411075+417205(Top 61%)11178(Top 69%)11178(Top 678%)
30K18.64 mi3.11 mi16468+25310910+16510910+16515619(Top 55%)10332(Top 64%)10332(Top 627%)
20M20.00 mi1.36 mi16223+24510781+12910781+12913283(Top 47%)9106(Top 57%)9106(Top 553%)
21M21.00 mi1.00 mi16038+18510670+11110670+11113860(Top 49%)9259(Top 57%)9259(Top 562%)
35K21.75 mi0.75 mi16270-23210749-7910749-7921434(Top 75%)12631(Top 78%)12631(Top 766%)
23M23.00 mi1.25 mi16539-26910837-8810837-8820101(Top 71%)11940(Top 74%)11940(Top 725%)
24M24.00 mi1.00 mi16972-43310987-15010987-15022509(Top 79%)13051(Top 81%)13051(Top 792%)
40K24.85 mi0.85 mi17118-14611017-3011017-3019665(Top 69%)11630(Top 72%)11630(Top 706%)
25.2M25.20 mi0.35 mi17149-3111021-411021-418531(Top 65%)11064(Top 69%)11064(Top 671%)
Finish26.22 mi1.02 mi17067+8210965+5610965+5615245(Top 54%)9576(Top 59%)9576(Top 581%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 60%
×21story building
+97ft-345ft

Overall

17122

Males

11264

M55-59

11264

5K→10K

3.1 - 6.2 mi

Top 62%
×5story building
+79ft-138ft

Overall

17477

Males

11437

M55-59

11437

10K→15K

6.2 - 9.3 mi

Top 60%
×3story building
+67ft-78ft

Overall

17122

Males

11264

M55-59

11264

15K→20K

9.3 - 12.4 mi

Top 57%
×5story building
+106ft-86ft

Overall

16131

Males

10791

M55-59

10791

20K→Half

12.4 - 13.1 mi

Top 64%
×2story building
+19ft-37ft

Overall

18217

Males

11699

M55-59

11699

Half→25K

13.1 - 15.5 mi

Top 61%
×4story building
+66ft-88ft

Overall

17205

Males

11178

M55-59

11178

25K→30K

15.5 - 18.6 mi

Top 55%
×9story building
+181ft-148ft

Overall

15619

Males

10332

M55-59

10332

30K→20M

18.6 - 20.0 mi

Top 47%
×5story building
+64ft-50ft

Overall

13283

Males

9106

M55-59

9106

20M→21M

20.0 - 21.0 mi

Top 49%
×8story building
+106ft-24ft

Overall

13860

Males

9259

M55-59

9259

21M→35K

21.0 - 21.8 mi

Top 75%
×7story building
+17ft-86ft

Overall

21434

Males

12631

M55-59

12631

35K→23M

21.8 - 23.0 mi

Top 71%
×5story building
+23ft-63ft

Overall

20101

Males

11940

M55-59

11940

23M→24M

23.0 - 24.0 mi

Top 79%
×6story building
+12ft-82ft

Overall

22509

Males

13051

M55-59

13051

24M→40K

24.0 - 24.9 mi

Top 69%
×1story
+6ft-20ft

Overall

19665

Males

11630

M55-59

11630

40K→25.2M

24.9 - 25.2 mi

Top 65%
×1story
+13ft-16ft

Overall

18531

Males

11064

M55-59

11064

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2story building
+22ft-21ft

Overall

15245

Males

9576

M55-59

9576

Passing Analysis

Category:
Athletes Passed
1720
Passed By
3433
Net Change
-1713
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15354
5K → 10K541239-1185#15354#16539
10K → 15K146347-201#16539#16740
15K → 20K293118+175#16740#16565
20K → Half13120-107#16565#16672
Half → 25K143192-49#16672#16721
25K → 30K354101+253#16721#16468
30K → 20M2527+245#16468#16223
20M → 21M21126+185#16223#16038
21M → 35K21253-232#16038#16270
35K → 23M47316-269#16270#16539
23M → 24M16449-433#16539#16972
24M → 40K35181-146#16972#17118
40K → 25.2M2253-31#17118#17149
25.2M → Finish11331+82#17149#17067
TOTALS17203433-1713
📊

Passing Visuals

Category:
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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