Boston Marathon logo
BOSTON MARATHON 2025

Clarence Chan

Bib: 21332•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
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
8:55/mi
27:43
↑ 97↓ 3451.5%
10K· 6.21 mi
8:57/mi
55:31
↑ 79↓ 1380.4%
15K· 9.32 mi
9:04/mi
1:23:41
↑ 67↓ 78
20K· 12.43 mi
9:07/mi
1:52:01
↑ 106↓ 860.1%
Half· 13.11 mi
9:01/mi
1:58:10
↑ 19↓ 370.5%
25K· 15.53 mi
9:46/mi
2:21:51
↑ 66↓ 880.2%
30K· 18.64 mi
10:35/mi
2:54:44
↑ 181↓ 1480.2%
20M
10:31/mi
3:09:02
↑ 64↓ 500.2%
21M
10:38/mi
3:19:40
↑ 106↓ 241.6%
35K· 21.75 mi
10:30/mi
3:27:31
↑ 17↓ 861.7%
23M
10:25/mi
3:40:34
↑ 23↓ 630.6%
24M
10:09/mi
3:50:43
↓ 821.3%
40K· 24.85 mi
10:07/mi
3:59:22
↓ 200.3%
25.2M
11:42/mi
4:03:24
↑ 13↓ 160.2%
Finish· 26.22 mi
10:06/mi
4:13:42
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:58:10
Pace9:01 /mi
2nd Half
Distance13.11 mi
Time2:15:32
Pace10:20 /mi
📊Positive Split: 14.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:4127:438:5527:43
8:55
-
10K
6.21 mi11:49:2955:318:5627:48
8:57
+0:02
15K
9.32 mi12:17:391:23:418:5928:10
9:04
+0:07
20K
12.43 mi12:45:591:52:019:0128:20
9:07
+0:03
Half
13.11 mi12:52:081:58:109:016:09
9:01
-0:06
25K
15.53 mi13:15:492:21:519:0823:41
9:46
+0:45
30K
18.64 mi13:48:422:54:449:2232:53
10:35
+0:49
20M
20.00 mi14:03:003:09:029:2714:18
10:31
-0:04
21M
21.00 mi14:13:383:19:409:3010:38
10:38
+0:07
35K
21.75 mi14:21:293:27:319:337:51
10:30
-0:08
23M
23.00 mi14:34:323:40:349:3513:03
10:25
-0:05
24M
24.00 mi14:44:413:50:439:3710:09
10:09
-0:16
40K
24.85 mi14:53:203:59:229:388:39
10:07
-0:02
25.2M
25.20 mi14:57:224:03:249:404:02
11:42
+1:35
Finish
26.22 mi15:07:404:13:429:4110:18
10:06
-1:36

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

8:55 /mi

Average Pace

9:41 /mi

Slowest Pace

11:42 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:58:10

47% of race

Time at Steady Pace

1:13:41

29% of race

Time at Slower Pace

1:01:51

24% of race

Average Pace: 9:41 /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 mi11:21:4127:438:5527:43
8:55
#22090
10K
6.21 mi11:49:2955:318:5627:48
8:57
#22128
15K
9.32 mi12:17:391:23:418:5928:10
9:04
#22189
20K
12.43 mi12:45:591:52:019:0128:20
9:07
#21994
Half
13.11 mi12:52:081:58:109:016:09
9:01
#21990
25K
15.53 mi13:15:492:21:519:0823:41
9:46
#22161
30K
18.64 mi13:48:422:54:449:2232:53
10:35
#22404
20M
20.00 mi14:03:003:09:029:2714:18
10:31
#22408
21M
21.00 mi14:13:383:19:409:3010:38
10:38
#22277
35K
21.75 mi14:21:293:27:319:337:51
10:30
#22314
23M
23.00 mi14:34:323:40:349:3513:03
10:25
#22248
24M
24.00 mi14:44:413:50:439:3710:09
10:09
#22221
40K
24.85 mi14:53:203:59:229:388:39
10:07
#22177
25.2M
25.20 mi14:57:224:03:249:404:02
11:42
#22186
Finish
26.22 mi15:07:404:13:429:4110:18
10:06
#22197
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM60-64Seg. OverallSeg. MalesSeg. M60-64
5K3.11 mi3.11 mi22090133521335222314(Top 79%)13520(Top 84%)13520(Top 1074%)
10K6.21 mi3.10 mi22128-3813383-3113383-3122140(Top 78%)13402(Top 83%)13402(Top 1064%)
15K9.32 mi3.11 mi22189-6113434-5113434-5122314(Top 79%)13520(Top 84%)13520(Top 1074%)
20K12.43 mi3.11 mi21994+19513338+9613338+9621539(Top 76%)13146(Top 82%)13146(Top 1044%)
Half13.11 mi0.68 mi21990+413339-113339-121870(Top 77%)13294(Top 83%)13294(Top 1056%)
25K15.53 mi2.42 mi22161-17113412-7313412-7322685(Top 80%)13598(Top 84%)13598(Top 1080%)
30K18.64 mi3.11 mi22404-24313491-7913491-7923130(Top 81%)13672(Top 85%)13672(Top 1086%)
20M20.00 mi1.36 mi22408-413471+2013471+2022488(Top 79%)13278(Top 82%)13278(Top 1055%)
21M21.00 mi1.00 mi22277+13113397+7413397+7420399(Top 72%)12217(Top 76%)12217(Top 970%)
35K21.75 mi0.75 mi22314-3713395+213395+223137(Top 81%)13453(Top 84%)13453(Top 1069%)
23M23.00 mi1.25 mi22248+6613331+6413331+6421799(Top 77%)12780(Top 79%)12780(Top 1015%)
24M24.00 mi1.00 mi22221+2713291+4013291+4021796(Top 77%)12711(Top 79%)12711(Top 1010%)
40K24.85 mi0.85 mi22177+4413265+2613265+2620830(Top 73%)12206(Top 76%)12206(Top 969%)
25.2M25.20 mi0.35 mi22186-913263+213263+222532(Top 79%)13047(Top 81%)13047(Top 1036%)
Finish26.22 mi1.02 mi22197-1113247+1613247+1623230(Top 82%)13389(Top 83%)13389(Top 1063%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 79%
×21story building
+97ft-345ft

Overall

22314

Males

13520

M60-64

13520

5K→10K

3.1 - 6.2 mi

Top 78%
×5story building
+79ft-138ft

Overall

22140

Males

13402

M60-64

13402

10K→15K

6.2 - 9.3 mi

Top 79%
×3story building
+67ft-78ft

Overall

22314

Males

13520

M60-64

13520

15K→20K

9.3 - 12.4 mi

Top 76%
×5story building
+106ft-86ft

Overall

21539

Males

13146

M60-64

13146

20K→Half

12.4 - 13.1 mi

Top 77%
×2story building
+19ft-37ft

Overall

21870

Males

13294

M60-64

13294

Half→25K

13.1 - 15.5 mi

Top 80%
×4story building
+66ft-88ft

Overall

22685

Males

13598

M60-64

13598

25K→30K

15.5 - 18.6 mi

Top 81%
×9story building
+181ft-148ft

Overall

23130

Males

13672

M60-64

13672

30K→20M

18.6 - 20.0 mi

Top 79%
×5story building
+64ft-50ft

Overall

22488

Males

13278

M60-64

13278

20M→21M

20.0 - 21.0 mi

Top 72%
×8story building
+106ft-24ft

Overall

20399

Males

12217

M60-64

12217

21M→35K

21.0 - 21.8 mi

Top 81%
×7story building
+17ft-86ft

Overall

23137

Males

13453

M60-64

13453

35K→23M

21.8 - 23.0 mi

Top 77%
×5story building
+23ft-63ft

Overall

21799

Males

12780

M60-64

12780

23M→24M

23.0 - 24.0 mi

Top 77%
×6story building
+12ft-82ft

Overall

21796

Males

12711

M60-64

12711

24M→40K

24.0 - 24.9 mi

Top 73%
×1story
+6ft-20ft

Overall

20830

Males

12206

M60-64

12206

40K→25.2M

24.9 - 25.2 mi

Top 79%
×1story
+13ft-16ft

Overall

22532

Males

13047

M60-64

13047

25.2M→Finish

25.2 - 26.2 mi

Top 82%
×2story building
+22ft-21ft

Overall

23230

Males

13389

M60-64

13389

Passing Analysis

Category:
Athletes Passed
1485
Passed By
1592
Net Change
-107
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22090
5K → 10K243281-38#22090#22128
10K → 15K165226-61#22128#22189
15K → 20K27782+195#22189#21994
20K → Half3531+4#21994#21990
Half → 25K92263-171#21990#22161
25K → 30K124367-243#22161#22404
30K → 20M7377-4#22404#22408
20M → 21M15120+131#22408#22277
21M → 35K2764-37#22277#22314
35K → 23M10842+66#22314#22248
23M → 24M6538+27#22248#22221
24M → 40K6420+44#22221#22177
40K → 25.2M2332-9#22177#22186
25.2M → Finish3849-11#22186#22197
TOTALS14851592-107
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing