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BOSTON MARATHON 2025

Amos Xiao

Bib: 10423•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 (M45-49)
#0 / 2386
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
8:18/mi
25:48
↑ 97↓ 3451.5%
10K· 6.21 mi
8:32/mi
52:20
↑ 79↓ 1380.4%
15K· 9.32 mi
8:52/mi
1:19:54
↑ 67↓ 78
20K· 12.43 mi
9:12/mi
1:48:29
↑ 106↓ 860.1%
Half· 13.11 mi
9:14/mi
1:54:47
↑ 19↓ 370.5%
25K· 15.53 mi
13:46/mi
2:28:09
↑ 66↓ 880.2%
30K· 18.64 mi
10:50/mi
3:01:48
↑ 181↓ 1480.2%
20M
12:44/mi
3:19:06
↑ 64↓ 500.2%
21M
11:49/mi
3:30:55
↑ 106↓ 241.6%
35K· 21.75 mi
10:39/mi
3:38:53
↑ 17↓ 861.7%
23M
12:01/mi
3:53:56
↑ 23↓ 630.6%
24M
10:26/mi
4:04:22
↓ 821.3%
40K· 24.85 mi
12:40/mi
4:15:12
↓ 200.3%
25.2M
11:36/mi
4:19:12
↑ 13↓ 160.2%
Finish· 26.22 mi
9:13/mi
4:28:36
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:47
Pace8:45 /mi
2nd Half
Distance13.11 mi
Time2:33:49
Pace11:44 /mi
📊Positive Split: 34.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:24:2525:488:1825:48
8:18
-
10K
6.21 mi11:50:5752:208:2526:32
8:32
+0:14
15K
9.32 mi12:18:311:19:548:3427:34
8:52
+0:20
20K
12.43 mi12:47:061:48:298:4428:35
9:12
+0:20
Half
13.11 mi12:53:241:54:478:456:18
9:14
+0:02
25K
15.53 mi13:26:462:28:099:3233:22
13:46
+4:32
30K
18.64 mi14:00:253:01:489:4533:39
10:50
-2:56
20M
20.00 mi14:17:433:19:069:5717:18
12:44
+1:54
21M
21.00 mi14:29:323:30:5510:0311:49
11:49
-0:55
35K
21.75 mi14:37:303:38:5310:047:58
10:39
-1:10
23M
23.00 mi14:52:333:53:5610:1015:03
12:01
+1:22
24M
24.00 mi15:02:594:04:2210:1110:26
10:26
-1:35
40K
24.85 mi15:13:494:15:1210:1610:50
12:40
+2:14
25.2M
25.20 mi15:17:494:19:1210:174:00
11:36
-1:04
Finish
26.22 mi15:27:134:28:3610:159:24
9:13
-2:23

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

8:18 /mi

Average Pace

10:15 /mi

Slowest Pace

13:46 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:04:11

46% of race

Time at Steady Pace

52:03

19% of race

Time at Slower Pace

1:32:22

34% of race

Average Pace: 10:15 /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 mi11:24:2525:488:1825:48
8:18
#18739
10K
6.21 mi11:50:5752:208:2526:32
8:32
#19378
15K
9.32 mi12:18:311:19:548:3427:34
8:52
#20091
20K
12.43 mi12:47:061:48:298:4428:35
9:12
#20578
Half
13.11 mi12:53:241:54:478:456:18
9:14
#20699
25K
15.53 mi13:26:462:28:099:3233:22
13:46
#23527
30K
18.64 mi14:00:253:01:489:4533:39
10:50
#23536
20M
20.00 mi14:17:433:19:069:5717:18
12:44
#23891
21M
21.00 mi14:29:323:30:5510:0311:49
11:49
#23841
35K
21.75 mi14:37:303:38:5310:047:58
10:39
#23814
23M
23.00 mi14:52:333:53:5610:1015:03
12:01
#23920
24M
24.00 mi15:02:594:04:2210:1110:26
10:26
#23865
40K
24.85 mi15:13:494:15:1210:1610:50
12:40
#24000
25.2M
25.20 mi15:17:494:19:1210:174:00
11:36
#23984
Finish
26.22 mi15:27:134:28:3610:159:24
9:13
#23872
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi18739119261192621411(Top 75%)13132(Top 82%)13132(Top 550%)
10K6.21 mi3.10 mi19378-63912216-29012216-29020036(Top 71%)12499(Top 78%)12499(Top 524%)
15K9.32 mi3.11 mi20091-71312512-29612512-29621411(Top 75%)13132(Top 82%)13132(Top 550%)
20K12.43 mi3.11 mi20578-48712720-20812720-20821893(Top 77%)13306(Top 83%)13306(Top 558%)
Half13.11 mi0.68 mi20699-12112770-5012770-5022729(Top 80%)13676(Top 85%)13676(Top 573%)
25K15.53 mi2.42 mi23527-282814030-126014030-126027765(Top 98%)15824(Top 98%)15824(Top 663%)
30K18.64 mi3.11 mi23536-913999+3113999+3123677(Top 83%)13926(Top 86%)13926(Top 584%)
20M20.00 mi1.36 mi23891-35514141-14214141-14226172(Top 92%)15002(Top 93%)15002(Top 629%)
21M21.00 mi1.00 mi23841+5014103+3814103+3823246(Top 82%)13563(Top 84%)13563(Top 568%)
35K21.75 mi0.75 mi23814+2714077+2614077+2623466(Top 83%)13618(Top 85%)13618(Top 571%)
23M23.00 mi1.25 mi23920-10614098-2114098-2125146(Top 89%)14405(Top 89%)14405(Top 604%)
24M24.00 mi1.00 mi23865+5514066+3214066+3222631(Top 80%)13130(Top 82%)13130(Top 550%)
40K24.85 mi0.85 mi24000-13514110-4414110-4425891(Top 91%)14734(Top 91%)14734(Top 618%)
25.2M25.20 mi0.35 mi23984+1614104+614104+622296(Top 78%)12946(Top 80%)12946(Top 543%)
Finish26.22 mi1.02 mi23872+11214041+6314041+6320055(Top 71%)11834(Top 73%)11834(Top 496%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 75%
×21story building
+97ft-345ft

Overall

21411

Males

13132

M45-49

13132

5K→10K

3.1 - 6.2 mi

Top 71%
×5story building
+79ft-138ft

Overall

20036

Males

12499

M45-49

12499

10K→15K

6.2 - 9.3 mi

Top 75%
×3story building
+67ft-78ft

Overall

21411

Males

13132

M45-49

13132

15K→20K

9.3 - 12.4 mi

Top 77%
×5story building
+106ft-86ft

Overall

21893

Males

13306

M45-49

13306

20K→Half

12.4 - 13.1 mi

Top 80%
×2story building
+19ft-37ft

Overall

22729

Males

13676

M45-49

13676

Half→25K

13.1 - 15.5 mi

Top 98%
×4story building
+66ft-88ft

Overall

27765

Males

15824

M45-49

15824

25K→30K

15.5 - 18.6 mi

Top 83%
×9story building
+181ft-148ft

Overall

23677

Males

13926

M45-49

13926

30K→20M

18.6 - 20.0 mi

Top 92%
×5story building
+64ft-50ft

Overall

26172

Males

15002

M45-49

15002

20M→21M

20.0 - 21.0 mi

Top 82%
×8story building
+106ft-24ft

Overall

23246

Males

13563

M45-49

13563

21M→35K

21.0 - 21.8 mi

Top 83%
×7story building
+17ft-86ft

Overall

23466

Males

13618

M45-49

13618

35K→23M

21.8 - 23.0 mi

Top 89%
×5story building
+23ft-63ft

Overall

25146

Males

14405

M45-49

14405

23M→24M

23.0 - 24.0 mi

Top 80%
×6story building
+12ft-82ft

Overall

22631

Males

13130

M45-49

13130

24M→40K

24.0 - 24.9 mi

Top 91%
×1story
+6ft-20ft

Overall

25891

Males

14734

M45-49

14734

40K→25.2M

24.9 - 25.2 mi

Top 78%
×1story
+13ft-16ft

Overall

22296

Males

12946

M45-49

12946

25.2M→Finish

25.2 - 26.2 mi

Top 71%
×2story building
+22ft-21ft

Overall

20055

Males

11834

M45-49

11834

Passing Analysis

Category:
Athletes Passed
788
Passed By
5921
Net Change
-5133
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18739
5K → 10K84723-639#18739#19378
10K → 15K52765-713#19378#20091
15K → 20K72559-487#20091#20578
20K → Half11132-121#20578#20699
Half → 25K12829-2828#20699#23527
25K → 30K151160-9#23527#23536
30K → 20M18373-355#23536#23891
20M → 21M8434+50#23891#23841
21M → 35K5124+27#23841#23814
35K → 23M38144-106#23814#23920
23M → 24M7015+55#23920#23865
24M → 40K14149-135#23865#24000
40K → 25.2M248+16#24000#23984
25.2M → Finish1186+112#23984#23872
TOTALS7885921-5133
📊

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