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BOSTON MARATHON 2025

Bo-Kuai Lai

Bib: 15015•M

OH

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M50-54)
#0 / 1996
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
7:32/mi
23:25
↑ 97↓ 3451.5%
10K· 6.21 mi
7:33/mi
46:52
↑ 79↓ 1380.4%
15K· 9.32 mi
7:50/mi
1:11:12
↑ 67↓ 78
20K· 12.43 mi
8:07/mi
1:36:24
↑ 106↓ 860.1%
Half· 13.11 mi
8:18/mi
1:42:04
↑ 19↓ 370.5%
25K· 15.53 mi
8:44/mi
2:03:14
↑ 66↓ 880.2%
30K· 18.64 mi
9:02/mi
2:31:18
↑ 181↓ 1480.2%
20M
9:43/mi
2:44:30
↑ 64↓ 500.2%
21M
9:52/mi
2:54:22
↑ 106↓ 241.6%
35K· 21.75 mi
9:47/mi
3:01:41
↑ 17↓ 861.7%
23M
10:05/mi
3:14:18
↑ 23↓ 630.6%
24M
10:39/mi
3:24:57
↓ 821.3%
40K· 24.85 mi
11:01/mi
3:34:22
↓ 200.3%
25.2M
11:27/mi
3:38:19
↑ 13↓ 160.2%
Finish· 26.22 mi
10:28/mi
3:48:59
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:42:04
Pace7:47 /mi
2nd Half
Distance13.11 mi
Time2:06:55
Pace9:41 /mi
📊Positive Split: 24.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:4323:257:3223:25
7:32
-
10K
6.21 mi11:19:1046:527:3323:27
7:33
+0:01
15K
9.32 mi11:43:301:11:127:3824:20
7:50
+0:17
20K
12.43 mi12:08:421:36:247:4525:12
8:07
+0:17
Half
13.11 mi12:14:221:42:047:475:40
8:18
+0:11
25K
15.53 mi12:35:322:03:147:5621:10
8:44
+0:26
30K
18.64 mi13:03:362:31:188:0728:04
9:02
+0:18
20M
20.00 mi13:16:482:44:308:1313:12
9:43
+0:41
21M
21.00 mi13:26:402:54:228:189:52
9:52
+0:09
35K
21.75 mi13:33:593:01:418:217:19
9:47
-0:05
23M
23.00 mi13:46:363:14:188:2712:37
10:05
+0:18
24M
24.00 mi13:57:153:24:578:3210:39
10:39
+0:34
40K
24.85 mi14:06:403:34:228:379:25
11:01
+0:22
25.2M
25.20 mi14:10:373:38:198:403:57
11:27
+0:26
Finish
26.22 mi14:21:173:48:598:4410:40
10:28
-0:59

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

7:32 /mi

Average Pace

8:44 /mi

Slowest Pace

11:27 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:31:18

66% of race

Time at Steady Pace

43:00

19% of race

Time at Slower Pace

34:41

15% of race

Average Pace: 8:44 /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 mi10:55:4323:257:3223:25
7:32
#12575
10K
6.21 mi11:19:1046:527:3323:27
7:33
#12502
15K
9.32 mi11:43:301:11:127:3824:20
7:50
#13216
20K
12.43 mi12:08:421:36:247:4525:12
8:07
#13877
Half
13.11 mi12:14:221:42:047:475:40
8:18
#14129
25K
15.53 mi12:35:322:03:147:5621:10
8:44
#15022
30K
18.64 mi13:03:362:31:188:0728:04
9:02
#15633
20M
20.00 mi13:16:482:44:308:1313:12
9:43
#16042
21M
21.00 mi13:26:402:54:228:189:52
9:52
#16098
35K
21.75 mi13:33:593:01:418:217:19
9:47
#16310
23M
23.00 mi13:46:363:14:188:2712:37
10:05
#16669
24M
24.00 mi13:57:153:24:578:3210:39
10:39
#17157
40K
24.85 mi14:06:403:34:228:379:25
11:01
#17545
25.2M
25.20 mi14:10:373:38:198:403:57
11:27
#17645
Finish
26.22 mi14:21:173:48:598:4410:40
10:28
#18079
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi125759444944414647(Top 52%)10222(Top 63%)10222(Top 512%)
10K6.21 mi3.10 mi12502+739396+489396+4812536(Top 44%)9396(Top 58%)9396(Top 471%)
15K9.32 mi3.11 mi13216-7149656-2609656-26014647(Top 52%)10222(Top 63%)10222(Top 512%)
20K12.43 mi3.11 mi13877-6619897-2419897-24115710(Top 55%)10627(Top 66%)10627(Top 532%)
Half13.11 mi0.68 mi14129-25210010-11310010-11317932(Top 63%)11602(Top 72%)11602(Top 581%)
25K15.53 mi2.42 mi15022-89310351-34110351-34118556(Top 65%)11767(Top 73%)11767(Top 590%)
30K18.64 mi3.11 mi15633-61110579-22810579-22817843(Top 63%)11296(Top 70%)11296(Top 566%)
20M20.00 mi1.36 mi16042-40910708-12910708-12919974(Top 70%)12143(Top 75%)12143(Top 608%)
21M21.00 mi1.00 mi16098-5610699+910699+917755(Top 63%)11041(Top 69%)11041(Top 553%)
35K21.75 mi0.75 mi16310-21210770-7110770-7121247(Top 75%)12545(Top 78%)12545(Top 629%)
23M23.00 mi1.25 mi16669-35910889-11910889-11920717(Top 73%)12250(Top 76%)12250(Top 614%)
24M24.00 mi1.00 mi17157-48811062-17311062-17323183(Top 82%)13393(Top 83%)13393(Top 671%)
40K24.85 mi0.85 mi17545-38811195-13311195-13323172(Top 82%)13319(Top 83%)13319(Top 667%)
25.2M25.20 mi0.35 mi17645-10011231-3611231-3621895(Top 77%)12726(Top 79%)12726(Top 638%)
Finish26.22 mi1.02 mi18079-43411421-19011421-19024195(Top 85%)13863(Top 86%)13863(Top 695%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 52%
×21story building
+97ft-345ft

Overall

14647

Males

10222

M50-54

10222

5K→10K

3.1 - 6.2 mi

Top 44%
×5story building
+79ft-138ft

Overall

12536

Males

9396

M50-54

9396

10K→15K

6.2 - 9.3 mi

Top 52%
×3story building
+67ft-78ft

Overall

14647

Males

10222

M50-54

10222

15K→20K

9.3 - 12.4 mi

Top 55%
×5story building
+106ft-86ft

Overall

15710

Males

10627

M50-54

10627

20K→Half

12.4 - 13.1 mi

Top 63%
×2story building
+19ft-37ft

Overall

17932

Males

11602

M50-54

11602

Half→25K

13.1 - 15.5 mi

Top 65%
×4story building
+66ft-88ft

Overall

18556

Males

11767

M50-54

11767

25K→30K

15.5 - 18.6 mi

Top 63%
×9story building
+181ft-148ft

Overall

17843

Males

11296

M50-54

11296

30K→20M

18.6 - 20.0 mi

Top 70%
×5story building
+64ft-50ft

Overall

19974

Males

12143

M50-54

12143

20M→21M

20.0 - 21.0 mi

Top 63%
×8story building
+106ft-24ft

Overall

17755

Males

11041

M50-54

11041

21M→35K

21.0 - 21.8 mi

Top 75%
×7story building
+17ft-86ft

Overall

21247

Males

12545

M50-54

12545

35K→23M

21.8 - 23.0 mi

Top 73%
×5story building
+23ft-63ft

Overall

20717

Males

12250

M50-54

12250

23M→24M

23.0 - 24.0 mi

Top 82%
×6story building
+12ft-82ft

Overall

23183

Males

13393

M50-54

13393

24M→40K

24.0 - 24.9 mi

Top 82%
×1story
+6ft-20ft

Overall

23172

Males

13319

M50-54

13319

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

21895

Males

12726

M50-54

12726

25.2M→Finish

25.2 - 26.2 mi

Top 85%
×2story building
+22ft-21ft

Overall

24195

Males

13863

M50-54

13863

Passing Analysis

Category:
Athletes Passed
820
Passed By
6324
Net Change
-5504
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12575
5K → 10K324251+73#12575#12502
10K → 15K49763-714#12502#13216
15K → 20K77738-661#13216#13877
20K → Half2254-252#13877#14129
Half → 25K33926-893#14129#15022
25K → 30K104715-611#15022#15633
30K → 20M38447-409#15633#16042
20M → 21M87143-56#16042#16098
21M → 35K24236-212#16098#16310
35K → 23M37396-359#16310#16669
23M → 24M15503-488#16669#17157
24M → 40K12400-388#17157#17545
40K → 25.2M9109-100#17545#17645
25.2M → Finish9443-434#17645#18079
TOTALS8206324-5504
📊

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