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BOSTON MARATHON 2025

Shengtai Lee

Bib: 18602•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

Start
0:00:00
Race begins
5K· 3.11 mi
25:01
Rank: #17006
Start → 5K
25:01 | 8:03/mi
10K· 6.21 mi
49:56
Rank: #16796 (+210)
5K → 10K
24:55 | 8:01/mi
15K· 9.32 mi
1:16:22
Rank: #17716 (-920)
10K → 15K
26:26 | 8:30/mi
20K· 12.43 mi
1:41:50
Rank: #17307 (+409)
15K → 20K
25:28 | 8:12/mi
Half· 13.11 mi
1:47:28
Rank: #17307
20K → Half
5:38 | 8:15/mi
25K· 15.53 mi
2:08:24
Rank: #17379 (-72)
Half → 25K
20:56 | 8:38/mi
30K· 18.64 mi
2:36:45
Rank: #17526 (-147)
25K → 30K
28:21 | 9:07/mi
20M
2:49:21
Rank: #17566 (-40)
30K → 20M
12:36 | 9:16/mi
21M
2:59:25
Rank: #17646 (-80)
20M → 21M
10:04 | 10:04/mi
35K· 21.75 mi
3:06:08
Rank: #17655 (-9)
21M → 35K
6:43 | 8:59/mi
23M
3:18:09
Rank: #17753 (-98)
35K → 23M
12:01 | 9:36/mi
24M
3:27:22
Rank: #17772 (-19)
23M → 24M
9:13 | 9:13/mi
40K· 24.85 mi
3:35:27
Rank: #17812 (-40)
24M → 40K
8:05 | 9:27/mi
25.2M
3:38:59
Rank: #17814 (-2)
40K → 25.2M
3:32 | 10:15/mi
Finish· 26.22 mi
3:47:59
Rank: #17831 (-17)
25.2M → Finish
9:00 | 8:50/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:28
Pace8:12 /mi
2nd Half
Distance13.11 mi
Time2:00:31
Pace9:12 /mi
📊Positive Split: 12.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:1425:018:0325:01
8:03
-
10K
6.21 mi11:41:0949:568:0224:55
8:01
-0:02
15K
9.32 mi12:07:351:16:228:1226:26
8:30
+0:29
20K
12.43 mi12:33:031:41:508:1225:28
8:12
-0:18
Half
13.11 mi12:38:411:47:288:125:38
8:15
+0:03
25K
15.53 mi12:59:372:08:248:1620:56
8:38
+0:23
30K
18.64 mi13:27:582:36:458:2528:21
9:07
+0:29
20M
20.00 mi13:40:342:49:218:2812:36
9:16
+0:09
21M
21.00 mi13:50:382:59:258:3310:04
10:04
+0:48
35K
21.75 mi13:57:213:06:088:346:43
8:59
-1:05
23M
23.00 mi14:09:223:18:098:3712:01
9:36
+0:37
24M
24.00 mi14:18:353:27:228:389:13
9:13
-0:23
40K
24.85 mi14:26:403:35:278:408:05
9:27
+0:14
25.2M
25.20 mi14:30:123:38:598:413:32
10:15
+0:48
Finish
26.22 mi14:39:123:47:598:429:00
8:50
-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

8:01 /mi

Average Pace

8:42 /mi

Slowest Pace

10:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:08:24

56% of race

Time at Steady Pace

1:05:53

29% of race

Time at Slower Pace

33:42

15% of race

Average Pace: 8:42 /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 mi11:16:1425:018:0325:01
8:03
#17006
10K
6.21 mi11:41:0949:568:0224:55
8:01
#16796
15K
9.32 mi12:07:351:16:228:1226:26
8:30
#17716
20K
12.43 mi12:33:031:41:508:1225:28
8:12
#17307
Half
13.11 mi12:38:411:47:288:125:38
8:15
#17307
25K
15.53 mi12:59:372:08:248:1620:56
8:38
#17379
30K
18.64 mi13:27:582:36:458:2528:21
9:07
#17526
20M
20.00 mi13:40:342:49:218:2812:36
9:16
#17566
21M
21.00 mi13:50:382:59:258:3310:04
10:04
#17646
35K
21.75 mi13:57:213:06:088:346:43
8:59
#17655
23M
23.00 mi14:09:223:18:098:3712:01
9:36
#17753
24M
24.00 mi14:18:353:27:228:389:13
9:13
#17772
40K
24.85 mi14:26:403:35:278:408:05
9:27
#17812
25.2M
25.20 mi14:30:123:38:598:413:32
10:15
#17814
Finish
26.22 mi14:39:123:47:598:429:00
8:50
#17831
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi17006112151121519366(Top 68%)12208(Top 76%)12208(Top 741%)
10K6.21 mi3.10 mi16796+21011134+8111134+8116632(Top 59%)11083(Top 69%)11083(Top 673%)
15K9.32 mi3.11 mi17716-92011511-37711511-37719366(Top 68%)12208(Top 76%)12208(Top 741%)
20K12.43 mi3.11 mi17307+40911335+17611335+17616284(Top 57%)10866(Top 67%)10866(Top 659%)
Half13.11 mi0.68 mi1730711328+711328+717611(Top 62%)11453(Top 71%)11453(Top 695%)
25K15.53 mi2.42 mi17379-7211344-1611344-1617994(Top 63%)11518(Top 72%)11518(Top 699%)
30K18.64 mi3.11 mi17526-14711340+411340+418278(Top 64%)11495(Top 71%)11495(Top 698%)
20M20.00 mi1.36 mi17566-4011333+711333+718141(Top 64%)11296(Top 70%)11296(Top 685%)
21M21.00 mi1.00 mi17646-8011354-2111354-2118548(Top 65%)11411(Top 71%)11411(Top 692%)
35K21.75 mi0.75 mi17655-911337+1711337+1718110(Top 64%)11100(Top 69%)11100(Top 674%)
23M23.00 mi1.25 mi17753-9811343-611343-619061(Top 67%)11467(Top 71%)11467(Top 696%)
24M24.00 mi1.00 mi17772-1911312+3111312+3118406(Top 65%)11107(Top 69%)11107(Top 674%)
40K24.85 mi0.85 mi17812-4011320-811320-818503(Top 65%)11070(Top 69%)11070(Top 672%)
25.2M25.20 mi0.35 mi17814-211311+911311+918034(Top 63%)10834(Top 67%)10834(Top 657%)
Finish26.22 mi1.02 mi17831-1711302+911302+918196(Top 64%)10969(Top 68%)10969(Top 666%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 68%
×21stories
+97ft-345ft

Overall

19366

Males

12208

M55-59

12208

5K→10K

3.1 - 6.2 mi

Top 59%
×5stories
+79ft-138ft

Overall

16632

Males

11083

M55-59

11083

10K→15K

6.2 - 9.3 mi

Top 68%
×3stories
+67ft-78ft

Overall

19366

Males

12208

M55-59

12208

15K→20K

9.3 - 12.4 mi

Top 57%
×5stories
+106ft-86ft

Overall

16284

Males

10866

M55-59

10866

20K→Half

12.4 - 13.1 mi

Top 62%
×2stories
+19ft-37ft

Overall

17611

Males

11453

M55-59

11453

Half→25K

13.1 - 15.5 mi

Top 63%
×4stories
+66ft-88ft

Overall

17994

Males

11518

M55-59

11518

25K→30K

15.5 - 18.6 mi

Top 64%
×9stories
+181ft-148ft

Overall

18278

Males

11495

M55-59

11495

30K→20M

18.6 - 20.0 mi

Top 64%
×5stories
+64ft-50ft

Overall

18141

Males

11296

M55-59

11296

20M→21M

20.0 - 21.0 mi

Top 65%
×8stories
+106ft-24ft

Overall

18548

Males

11411

M55-59

11411

21M→35K

21.0 - 21.8 mi

Top 64%
×7stories
+17ft-86ft

Overall

18110

Males

11100

M55-59

11100

35K→23M

21.8 - 23.0 mi

Top 67%
×5stories
+23ft-63ft

Overall

19061

Males

11467

M55-59

11467

23M→24M

23.0 - 24.0 mi

Top 65%
×6stories
+12ft-82ft

Overall

18406

Males

11107

M55-59

11107

24M→40K

24.0 - 24.9 mi

Top 65%
×1story
+6ft-20ft

Overall

18503

Males

11070

M55-59

11070

40K→25.2M

24.9 - 25.2 mi

Top 63%
×1story
+13ft-16ft

Overall

18034

Males

10834

M55-59

10834

25.2M→Finish

25.2 - 26.2 mi

Top 64%
×2stories
+22ft-21ft

Overall

18196

Males

10969

M55-59

10969

Passing Analysis

Category:
Athletes Passed
1786
Passed By
2611
Net Change
-825
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17006
5K → 10K410200+210#17006#16796
10K → 15K38958-920#16796#17716
15K → 20K43324+409#17716#17307
20K → Half34340#17307#17307
Half → 25K146218-72#17307#17379
25K → 30K175322-147#17379#17526
30K → 20M103143-40#17526#17566
20M → 21M84164-80#17566#17646
21M → 35K5968-9#17646#17655
35K → 23M87185-98#17655#17753
23M → 24M7493-19#17753#17772
24M → 40K4383-40#17772#17812
40K → 25.2M3335-2#17812#17814
25.2M → Finish6784-17#17814#17831
TOTALS17862611-825
📊

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