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BOSTON MARATHON 2025

Kun Sig Chai

Bib: 15018•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M60-64)
#0 / 1259
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
9:03/mi
28:07
↑ 97↓ 3451.5%
10K· 6.21 mi
9:09/mi
56:32
↑ 79↓ 1380.4%
15K· 9.32 mi
9:28/mi
1:25:58
↑ 67↓ 78
20K· 12.43 mi
10:10/mi
1:57:34
↑ 106↓ 860.1%
Half· 13.11 mi
12:10/mi
2:05:52
↑ 19↓ 370.5%
25K· 15.53 mi
10:15/mi
2:30:43
↑ 66↓ 880.2%
30K· 18.64 mi
10:53/mi
3:04:31
↑ 181↓ 1480.2%
20M
10:57/mi
3:19:24
↑ 64↓ 500.2%
21M
13:01/mi
3:32:25
↑ 106↓ 241.6%
35K· 21.75 mi
11:03/mi
3:40:41
↑ 17↓ 861.7%
23M
11:52/mi
3:55:33
↑ 23↓ 630.6%
24M
11:25/mi
4:06:58
↓ 821.3%
40K· 24.85 mi
11:43/mi
4:16:59
↓ 200.3%
25.2M
14:18/mi
4:21:55
↑ 13↓ 160.2%
Finish· 26.22 mi
11:12/mi
4:33:20
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:05:52
Pace9:36 /mi
2nd Half
Distance13.11 mi
Time2:27:28
Pace11:15 /mi
📊Positive Split: 17.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:2328:079:0328:07
9:03
-
10K
6.21 mi11:47:4856:329:0628:25
9:09
+0:06
15K
9.32 mi12:17:141:25:589:1329:26
9:28
+0:19
20K
12.43 mi12:48:501:57:349:2831:36
10:10
+0:42
Half
13.11 mi12:57:082:05:529:368:18
12:10
+2:00
25K
15.53 mi13:21:592:30:439:4224:51
10:15
-1:55
30K
18.64 mi13:55:473:04:319:5433:48
10:53
+0:38
20M
20.00 mi14:10:403:19:249:5814:53
10:57
+0:04
21M
21.00 mi14:23:413:32:2510:0713:01
13:01
+2:04
35K
21.75 mi14:31:573:40:4110:098:16
11:03
-1:58
23M
23.00 mi14:46:493:55:3310:1414:52
11:52
+0:49
24M
24.00 mi14:58:144:06:5810:1711:25
11:25
-0:27
40K
24.85 mi15:08:154:16:5910:2010:01
11:43
+0:18
25.2M
25.20 mi15:13:114:21:5510:244:56
14:18
+2:35
Finish
26.22 mi15:24:364:33:2010:2611:25
11:12
-3:06

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

9:03 /mi

Average Pace

10:26 /mi

Slowest Pace

14:18 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:22:25

52% of race

Time at Steady Pace

1:29:48

33% of race

Time at Slower Pace

41:07

15% of race

Average Pace: 10:25 /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 mi11:19:2328:079:0328:07
9:03
#22630
10K
6.21 mi11:47:4856:329:0628:25
9:09
#22803
15K
9.32 mi12:17:141:25:589:1329:26
9:28
#23191
20K
12.43 mi12:48:501:57:349:2831:36
10:10
#23638
Half
13.11 mi12:57:082:05:529:368:18
12:10
#24009
25K
15.53 mi13:21:592:30:439:4224:51
10:15
#23982
30K
18.64 mi13:55:473:04:319:5433:48
10:53
#23960
20M
20.00 mi14:10:403:19:249:5814:53
10:57
#23921
21M
21.00 mi14:23:413:32:2510:0713:01
13:01
#24036
35K
21.75 mi14:31:573:40:4110:098:16
11:03
#24050
23M
23.00 mi14:46:493:55:3310:1414:52
11:52
#24101
24M
24.00 mi14:58:144:06:5810:1711:25
11:25
#24152
40K
24.85 mi15:08:154:16:5910:2010:01
11:43
#24182
25.2M
25.20 mi15:13:114:21:5510:244:56
14:18
#24245
Finish
26.22 mi15:24:364:33:2010:2611:25
11:12
#24308
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM60-64Seg. OverallSeg. MalesSeg. M60-64
5K3.11 mi3.11 mi22630135921359223665(Top 83%)14133(Top 88%)14133(Top 1123%)
10K6.21 mi3.10 mi22803-17313696-10413696-10422980(Top 81%)13796(Top 86%)13796(Top 1096%)
15K9.32 mi3.11 mi23191-38813894-19813894-19823665(Top 83%)14133(Top 88%)14133(Top 1123%)
20K12.43 mi3.11 mi23638-44714098-20414098-20424580(Top 87%)14480(Top 90%)14480(Top 1150%)
Half13.11 mi0.68 mi24009-37114247-14914247-14927565(Top 97%)15744(Top 98%)15744(Top 1251%)
25K15.53 mi2.42 mi23982+2714231+1614231+1623824(Top 84%)14115(Top 88%)14115(Top 1121%)
30K18.64 mi3.11 mi23960+2214192+3914192+3923763(Top 84%)13968(Top 87%)13968(Top 1109%)
20M20.00 mi1.36 mi23921+3914155+3714155+3723496(Top 83%)13758(Top 85%)13758(Top 1093%)
21M21.00 mi1.00 mi24036-11514187-3214187-3225060(Top 88%)14397(Top 89%)14397(Top 1144%)
35K21.75 mi0.75 mi24050-1414181+614181+624309(Top 86%)14022(Top 87%)14022(Top 1114%)
23M23.00 mi1.25 mi24101-5114192-1114192-1124920(Top 88%)14295(Top 89%)14295(Top 1135%)
24M24.00 mi1.00 mi24152-5114194-214194-224749(Top 87%)14169(Top 88%)14169(Top 1125%)
40K24.85 mi0.85 mi24182-3014200-614200-624503(Top 86%)14020(Top 87%)14020(Top 1114%)
25.2M25.20 mi0.35 mi24245-6314229-2914229-2926574(Top 94%)15046(Top 93%)15046(Top 1195%)
Finish26.22 mi1.02 mi24308-6314248-1914248-1925701(Top 90%)14633(Top 91%)14633(Top 1162%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 83%
×21story building
+97ft-345ft

Overall

23665

Males

14133

M60-64

14133

5K→10K

3.1 - 6.2 mi

Top 81%
×5story building
+79ft-138ft

Overall

22980

Males

13796

M60-64

13796

10K→15K

6.2 - 9.3 mi

Top 83%
×3story building
+67ft-78ft

Overall

23665

Males

14133

M60-64

14133

15K→20K

9.3 - 12.4 mi

Top 87%
×5story building
+106ft-86ft

Overall

24580

Males

14480

M60-64

14480

20K→Half

12.4 - 13.1 mi

Top 97%
×2story building
+19ft-37ft

Overall

27565

Males

15744

M60-64

15744

Half→25K

13.1 - 15.5 mi

Top 84%
×4story building
+66ft-88ft

Overall

23824

Males

14115

M60-64

14115

25K→30K

15.5 - 18.6 mi

Top 84%
×9story building
+181ft-148ft

Overall

23763

Males

13968

M60-64

13968

30K→20M

18.6 - 20.0 mi

Top 83%
×5story building
+64ft-50ft

Overall

23496

Males

13758

M60-64

13758

20M→21M

20.0 - 21.0 mi

Top 88%
×8story building
+106ft-24ft

Overall

25060

Males

14397

M60-64

14397

21M→35K

21.0 - 21.8 mi

Top 86%
×7story building
+17ft-86ft

Overall

24309

Males

14022

M60-64

14022

35K→23M

21.8 - 23.0 mi

Top 88%
×5story building
+23ft-63ft

Overall

24920

Males

14295

M60-64

14295

23M→24M

23.0 - 24.0 mi

Top 87%
×6story building
+12ft-82ft

Overall

24749

Males

14169

M60-64

14169

24M→40K

24.0 - 24.9 mi

Top 86%
×1story
+6ft-20ft

Overall

24503

Males

14020

M60-64

14020

40K→25.2M

24.9 - 25.2 mi

Top 94%
×1story
+13ft-16ft

Overall

26574

Males

15046

M60-64

15046

25.2M→Finish

25.2 - 26.2 mi

Top 90%
×2story building
+22ft-21ft

Overall

25701

Males

14633

M60-64

14633

Passing Analysis

Category:
Athletes Passed
891
Passed By
2569
Net Change
-1678
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22630
5K → 10K177350-173#22630#22803
10K → 15K71459-388#22803#23191
15K → 20K56503-447#23191#23638
20K → Half0371-371#23638#24009
Half → 25K133106+27#24009#23982
25K → 30K157135+22#23982#23960
30K → 20M9758+39#23960#23921
20M → 21M29144-115#23921#24036
21M → 35K3347-14#24036#24050
35K → 23M51102-51#24050#24101
23M → 24M2778-51#24101#24152
24M → 40K3565-30#24152#24182
40K → 25.2M568-63#24182#24245
25.2M → Finish2083-63#24245#24308
TOTALS8912569-1678
📊

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