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BOSTON MARATHON 2025

Samuyen Do

Bib: 32545•M

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M40-44)
#0 / 2247
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
31:18
Rank: #25764
Start → 5K
10:04/mi
31:18 split
10K· 6.21 mi
1:02:10
Rank: #25450 (+314)
5K → 10K
9:56/mi
30:52 split
15K· 9.32 mi
1:33:05
Rank: #25253 (+197)
10K → 15K
9:57/mi
30:55 split
20K· 12.43 mi
2:04:13
Rank: #25009 (+244)
15K → 20K
10:01/mi
31:08 split
Half· 13.11 mi
2:11:07
Rank: #25001 (+8)
20K → Half
10:07/mi
6:54 split
25K· 15.53 mi
2:36:31
Rank: #24891 (+110)
Half → 25K
10:29/mi
25:24 split
30K· 18.64 mi
3:16:29
Rank: #25320 (-429)
25K → 30K
12:52/mi
39:58 split
20M
3:35:55
Rank: #25573 (-253)
30K → 20M
14:18/mi
19:26 split
21M
3:47:00
Rank: #25421 (+152)
20M → 21M
11:05/mi
11:05 split
35K· 21.75 mi
3:54:59
Rank: #25346 (+75)
21M → 35K
10:40/mi
7:59 split
23M
4:11:26
Rank: #25443 (-97)
35K → 23M
13:08/mi
16:27 split
24M
4:27:51
Rank: #25797 (-354)
23M → 24M
16:25/mi
16:25 split
40K· 24.85 mi
4:39:03
Rank: #25841 (-44)
24M → 40K
13:06/mi
11:12 split
25.2M
4:43:48
Rank: #25858 (-17)
40K → 25.2M
13:46/mi
4:45 split
Finish· 26.22 mi
4:54:47
Rank: #25833 (+25)
25.2M → Finish
10:47/mi
10:59 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:11:07
Pace10:00 /mi
2nd Half
Distance13.11 mi
Time2:43:40
Pace12:29 /mi
📊Positive Split: 24.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:41:1931:1810:0431:18
10:04
-
10K
6.21 mi11:12:111:02:1010:0030:52
9:56
-0:08
15K
9.32 mi11:43:061:33:059:5930:55
9:57
+0:01
20K
12.43 mi12:14:142:04:1310:0031:08
10:01
+0:04
Half
13.11 mi12:21:082:11:0710:006:54
10:07
+0:06
25K
15.53 mi12:46:322:36:3110:0525:24
10:29
+0:22
30K
18.64 mi13:26:303:16:2910:3239:58
12:52
+2:23
20M
20.00 mi13:45:563:35:5510:4819:26
14:18
+1:26
21M
21.00 mi13:57:013:47:0010:4911:05
11:05
-3:13
35K
21.75 mi14:05:003:54:5910:487:59
10:40
-0:25
23M
23.00 mi14:21:274:11:2610:5616:27
13:08
+2:28
24M
24.00 mi14:37:524:27:5111:1016:25
16:25
+3:17
40K
24.85 mi14:49:044:39:0311:1411:12
13:06
-3:19
25.2M
25.20 mi14:53:494:43:4811:164:45
13:46
+0:40
Finish
26.22 mi15:04:484:54:4711:1510:59
10:47
-2:59

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

9:56 /mi

Average Pace

11:15 /mi

Slowest Pace

16:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

3:06:34

63% of race

Time at Slower Pace

1:48:13

37% of race

Average Pace: 11:15 /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 mi10:41:1931:1810:0431:18
10:04
#25764
10K
6.21 mi11:12:111:02:1010:0030:52
9:56
#25450
15K
9.32 mi11:43:061:33:059:5930:55
9:57
#25253
20K
12.43 mi12:14:142:04:1310:0031:08
10:01
#25009
Half
13.11 mi12:21:082:11:0710:006:54
10:07
#25001
25K
15.53 mi12:46:322:36:3110:0525:24
10:29
#24891
30K
18.64 mi13:26:303:16:2910:3239:58
12:52
#25320
20M
20.00 mi13:45:563:35:5510:4819:26
14:18
#25573
21M
21.00 mi13:57:013:47:0010:4911:05
11:05
#25421
35K
21.75 mi14:05:003:54:5910:487:59
10:40
#25346
23M
23.00 mi14:21:274:11:2610:5616:27
13:08
#25443
24M
24.00 mi14:37:524:27:5111:1016:25
16:25
#25797
40K
24.85 mi14:49:044:39:0311:1411:12
13:06
#25841
25.2M
25.20 mi14:53:494:43:4811:164:45
13:46
#25858
Finish
26.22 mi15:04:484:54:4711:1510:59
10:47
#25833
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi25764150741507424908(Top 88%)14678(Top 91%)14678(Top 653%)
10K6.21 mi3.10 mi25450+31414912+16214912+16225175(Top 89%)14786(Top 92%)14786(Top 658%)
15K9.32 mi3.11 mi25253+19714826+8614826+8624908(Top 88%)14678(Top 91%)14678(Top 653%)
20K12.43 mi3.11 mi25009+24414710+11614710+11624263(Top 85%)14342(Top 89%)14342(Top 638%)
Half13.11 mi0.68 mi25001+814697+1314697+1325069(Top 88%)14709(Top 91%)14709(Top 655%)
25K15.53 mi2.42 mi24891+11014631+6614631+6624339(Top 86%)14350(Top 89%)14350(Top 639%)
30K18.64 mi3.11 mi25320-42914796-16514796-16526543(Top 93%)15230(Top 95%)15230(Top 678%)
20M20.00 mi1.36 mi25573-25314897-10114897-10127505(Top 97%)15612(Top 97%)15612(Top 695%)
21M21.00 mi1.00 mi25421+15214810+8714810+8721634(Top 76%)12801(Top 79%)12801(Top 570%)
35K21.75 mi0.75 mi25346+7514766+4414766+4423529(Top 83%)13657(Top 85%)13657(Top 608%)
23M23.00 mi1.25 mi25443-9714800-3414800-3426549(Top 93%)15110(Top 94%)15110(Top 672%)
24M24.00 mi1.00 mi25797-35414958-15814958-15828266(Top 100%)16007(Top 99%)16007(Top 712%)
40K24.85 mi0.85 mi25841-4414974-1614974-1626393(Top 93%)14993(Top 93%)14993(Top 667%)
25.2M25.20 mi0.35 mi25858-1714978-414978-426029(Top 92%)14763(Top 92%)14763(Top 657%)
Finish26.22 mi1.02 mi25833+2514954+2414954+2424909(Top 88%)14234(Top 88%)14234(Top 633%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 88%
×21story building
+97ft-345ft

Overall

24908

Males

14678

M40-44

14678

5K→10K

3.1 - 6.2 mi

Top 89%
×5story building
+79ft-138ft

Overall

25175

Males

14786

M40-44

14786

10K→15K

6.2 - 9.3 mi

Top 88%
×3story building
+67ft-78ft

Overall

24908

Males

14678

M40-44

14678

15K→20K

9.3 - 12.4 mi

Top 85%
×5story building
+106ft-86ft

Overall

24263

Males

14342

M40-44

14342

20K→Half

12.4 - 13.1 mi

Top 88%
×2story building
+19ft-37ft

Overall

25069

Males

14709

M40-44

14709

Half→25K

13.1 - 15.5 mi

Top 86%
×4story building
+66ft-88ft

Overall

24339

Males

14350

M40-44

14350

25K→30K

15.5 - 18.6 mi

Top 93%
×9story building
+181ft-148ft

Overall

26543

Males

15230

M40-44

15230

30K→20M

18.6 - 20.0 mi

Top 97%
×5story building
+64ft-50ft

Overall

27505

Males

15612

M40-44

15612

20M→21M

20.0 - 21.0 mi

Top 76%
×8story building
+106ft-24ft

Overall

21634

Males

12801

M40-44

12801

21M→35K

21.0 - 21.8 mi

Top 83%
×7story building
+17ft-86ft

Overall

23529

Males

13657

M40-44

13657

35K→23M

21.8 - 23.0 mi

Top 93%
×5story building
+23ft-63ft

Overall

26549

Males

15110

M40-44

15110

23M→24M

23.0 - 24.0 mi

Top 100%
×6story building
+12ft-82ft

Overall

28266

Males

16007

M40-44

16007

24M→40K

24.0 - 24.9 mi

Top 93%
×1story
+6ft-20ft

Overall

26393

Males

14993

M40-44

14993

40K→25.2M

24.9 - 25.2 mi

Top 92%
×1story
+13ft-16ft

Overall

26029

Males

14763

M40-44

14763

25.2M→Finish

25.2 - 26.2 mi

Top 88%
×2story building
+22ft-21ft

Overall

24909

Males

14234

M40-44

14234

Passing Analysis

Category:
Athletes Passed
1450
Passed By
1519
Net Change
-69
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#25764
5K → 10K37864+314#25764#25450
10K → 15K24952+197#25450#25253
15K → 20K27733+244#25253#25009
20K → Half3628+8#25009#25001
Half → 25K15545+110#25001#24891
25K → 30K34463-429#24891#25320
30K → 20M8261-253#25320#25573
20M → 21M1542+152#25573#25421
21M → 35K772+75#25421#25346
35K → 23M18115-97#25346#25443
23M → 24M5359-354#25443#25797
24M → 40K1256-44#25797#25841
40K → 25.2M1229-17#25841#25858
25.2M → Finish3510+25#25858#25833
TOTALS14501519-69
📊

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