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BOSTON MARATHON 2025

Kwan Lai

Bib: 17892•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
8:09/mi
25:20
↑ 97↓ 3451.5%
10K· 6.21 mi
8:10/mi
50:43
↑ 79↓ 1380.4%
15K· 9.32 mi
8:21/mi
1:16:38
↑ 67↓ 78
20K· 12.43 mi
8:59/mi
1:44:32
↑ 106↓ 860.1%
Half· 13.11 mi
8:24/mi
1:50:16
↑ 19↓ 370.5%
25K· 15.53 mi
8:39/mi
2:11:15
↑ 66↓ 880.2%
30K· 18.64 mi
9:07/mi
2:39:33
↑ 181↓ 1480.2%
20M
9:06/mi
2:51:55
↑ 64↓ 500.2%
21M
9:40/mi
3:01:35
↑ 106↓ 241.6%
35K· 21.75 mi
9:05/mi
3:08:23
↑ 17↓ 861.7%
23M
9:02/mi
3:19:41
↑ 23↓ 630.6%
24M
8:57/mi
3:28:38
↓ 821.3%
40K· 24.85 mi
8:57/mi
3:36:17
↓ 200.3%
25.2M
10:00/mi
3:39:44
↑ 13↓ 160.2%
Finish· 26.22 mi
8:53/mi
3:48:47
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:50:16
Pace8:25 /mi
2nd Half
Distance13.11 mi
Time1:58:31
Pace9:02 /mi
📊Positive Split: 7.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:5125:208:0925:20
8:09
-
10K
6.21 mi11:41:1450:438:1025:23
8:10
+0:01
15K
9.32 mi12:07:091:16:388:1325:55
8:21
+0:11
20K
12.43 mi12:35:031:44:328:2527:54
8:59
+0:38
Half
13.11 mi12:40:471:50:168:255:44
8:24
-0:35
25K
15.53 mi13:01:462:11:158:2720:59
8:39
+0:15
30K
18.64 mi13:30:042:39:338:3428:18
9:07
+0:28
20M
20.00 mi13:42:262:51:558:3612:22
9:06
-0:01
21M
21.00 mi13:52:063:01:358:399:40
9:40
+0:34
35K
21.75 mi13:58:543:08:238:406:48
9:05
-0:35
23M
23.00 mi14:10:123:19:418:4111:18
9:02
-0:03
24M
24.00 mi14:19:093:28:388:428:57
8:57
-0:05
40K
24.85 mi14:26:483:36:178:427:39
8:57
0:00
25.2M
25.20 mi14:30:153:39:448:433:27
10:00
+1:03
Finish
26.22 mi14:39:183:48:478:449:03
8:53
-1:07

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

8:09 /mi

Average Pace

8:44 /mi

Slowest Pace

10:00 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:43:21

45% of race

Time at Steady Pace

1:52:19

49% of race

Time at Slower Pace

13:07

6% 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 mi11:15:5125:208:0925:20
8:09
#17761
10K
6.21 mi11:41:1450:438:1025:23
8:10
#17699
15K
9.32 mi12:07:091:16:388:1325:55
8:21
#17900
20K
12.43 mi12:35:031:44:328:2527:54
8:59
#18724
Half
13.11 mi12:40:471:50:168:255:44
8:24
#18714
25K
15.53 mi13:01:462:11:158:2720:59
8:39
#18584
30K
18.64 mi13:30:042:39:338:3428:18
9:07
#18501
20M
20.00 mi13:42:262:51:558:3612:22
9:06
#18408
21M
21.00 mi13:52:063:01:358:399:40
9:40
#18284
35K
21.75 mi13:58:543:08:238:406:48
9:05
#18291
23M
23.00 mi14:10:123:19:418:4111:18
9:02
#18178
24M
24.00 mi14:19:093:28:388:428:57
8:57
#18110
40K
24.85 mi14:26:483:36:178:427:39
8:57
#18028
25.2M
25.20 mi14:30:153:39:448:433:27
10:00
#18011
Finish
26.22 mi14:39:183:48:478:449:03
8:53
#18041
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi17761115131151318324(Top 65%)11769(Top 73%)11769(Top 714%)
10K6.21 mi3.10 mi17699+6211501+1211501+1217685(Top 62%)11527(Top 72%)11527(Top 699%)
15K9.32 mi3.11 mi17900-20111581-8011581-8018324(Top 65%)11769(Top 73%)11769(Top 714%)
20K12.43 mi3.11 mi18724-82411923-34211923-34220847(Top 73%)12818(Top 80%)12818(Top 778%)
Half13.11 mi0.68 mi18714+1011919+411919+418579(Top 65%)11852(Top 74%)11852(Top 719%)
25K15.53 mi2.42 mi18584+13011846+7311846+7318103(Top 64%)11571(Top 72%)11571(Top 702%)
30K18.64 mi3.11 mi18501+8311788+5811788+5818218(Top 64%)11469(Top 71%)11469(Top 696%)
20M20.00 mi1.36 mi18408+9311710+7811710+7817304(Top 61%)10949(Top 68%)10949(Top 664%)
21M21.00 mi1.00 mi18284+12411633+7711633+7716857(Top 59%)10631(Top 66%)10631(Top 645%)
35K21.75 mi0.75 mi18291-711619+1411619+1418635(Top 66%)11313(Top 70%)11313(Top 686%)
23M23.00 mi1.25 mi18178+11311538+8111538+8116407(Top 58%)10249(Top 64%)10249(Top 622%)
24M24.00 mi1.00 mi18110+6811482+5611482+5617099(Top 60%)10507(Top 65%)10507(Top 638%)
40K24.85 mi0.85 mi18028+8211420+6211420+6215996(Top 56%)9922(Top 62%)9922(Top 602%)
25.2M25.20 mi0.35 mi18011+1711402+1811402+1817015(Top 60%)10380(Top 64%)10380(Top 630%)
Finish26.22 mi1.02 mi18041-3011399+311399+318434(Top 65%)11083(Top 69%)11083(Top 673%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 65%
×21story building
+97ft-345ft

Overall

18324

Males

11769

M55-59

11769

5K→10K

3.1 - 6.2 mi

Top 62%
×5story building
+79ft-138ft

Overall

17685

Males

11527

M55-59

11527

10K→15K

6.2 - 9.3 mi

Top 65%
×3story building
+67ft-78ft

Overall

18324

Males

11769

M55-59

11769

15K→20K

9.3 - 12.4 mi

Top 73%
×5story building
+106ft-86ft

Overall

20847

Males

12818

M55-59

12818

20K→Half

12.4 - 13.1 mi

Top 65%
×2story building
+19ft-37ft

Overall

18579

Males

11852

M55-59

11852

Half→25K

13.1 - 15.5 mi

Top 64%
×4story building
+66ft-88ft

Overall

18103

Males

11571

M55-59

11571

25K→30K

15.5 - 18.6 mi

Top 64%
×9story building
+181ft-148ft

Overall

18218

Males

11469

M55-59

11469

30K→20M

18.6 - 20.0 mi

Top 61%
×5story building
+64ft-50ft

Overall

17304

Males

10949

M55-59

10949

20M→21M

20.0 - 21.0 mi

Top 59%
×8story building
+106ft-24ft

Overall

16857

Males

10631

M55-59

10631

21M→35K

21.0 - 21.8 mi

Top 66%
×7story building
+17ft-86ft

Overall

18635

Males

11313

M55-59

11313

35K→23M

21.8 - 23.0 mi

Top 58%
×5story building
+23ft-63ft

Overall

16407

Males

10249

M55-59

10249

23M→24M

23.0 - 24.0 mi

Top 60%
×6story building
+12ft-82ft

Overall

17099

Males

10507

M55-59

10507

24M→40K

24.0 - 24.9 mi

Top 56%
×1story
+6ft-20ft

Overall

15996

Males

9922

M55-59

9922

40K→25.2M

24.9 - 25.2 mi

Top 60%
×1story
+13ft-16ft

Overall

17015

Males

10380

M55-59

10380

25.2M→Finish

25.2 - 26.2 mi

Top 65%
×2story building
+22ft-21ft

Overall

18434

Males

11083

M55-59

11083

Passing Analysis

Category:
Athletes Passed
1880
Passed By
2160
Net Change
-280
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17761
5K → 10K314252+62#17761#17699
10K → 15K129330-201#17699#17900
15K → 20K44868-824#17900#18724
20K → Half4939+10#18724#18714
Half → 25K21888+130#18714#18584
25K → 30K281198+83#18584#18501
30K → 20M15259+93#18501#18408
20M → 21M16440+124#18408#18284
21M → 35K5865-7#18284#18291
35K → 23M16148+113#18291#18178
23M → 24M10739+68#18178#18110
24M → 40K10826+82#18110#18028
40K → 25.2M3821+17#18028#18011
25.2M → Finish5787-30#18011#18041
TOTALS18802160-280
📊

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