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BOSTON MARATHON 2025

Wai Keung Jason Tso

Bib: 13742•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M50-54)
#0 / 1996
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
7:27/mi
23:10
↑ 97↓ 3451.5%
10K· 6.21 mi
7:34/mi
46:39
↑ 79↓ 1380.4%
15K· 9.32 mi
7:56/mi
1:11:18
↑ 67↓ 78
20K· 12.43 mi
8:11/mi
1:36:42
↑ 106↓ 860.1%
Half· 13.11 mi
8:11/mi
1:42:17
↑ 19↓ 370.5%
25K· 15.53 mi
8:46/mi
2:03:33
↑ 66↓ 880.2%
30K· 18.64 mi
9:26/mi
2:32:52
↑ 181↓ 1480.2%
20M
10:45/mi
2:47:28
↑ 64↓ 500.2%
21M
10:20/mi
2:57:48
↑ 106↓ 241.6%
35K· 21.75 mi
10:20/mi
3:05:32
↑ 17↓ 861.7%
23M
11:08/mi
3:19:28
↑ 23↓ 630.6%
24M
9:50/mi
3:29:18
↓ 821.3%
40K· 24.85 mi
9:27/mi
3:37:23
↓ 200.3%
25.2M
9:46/mi
3:40:45
↑ 13↓ 160.2%
Finish· 26.22 mi
8:19/mi
3:49:14
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:42:17
Pace7:48 /mi
2nd Half
Distance13.11 mi
Time2:06:57
Pace9:41 /mi
📊Positive Split: 24.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:3323:107:2723:10
7:27
-
10K
6.21 mi11:16:0246:397:3023:29
7:34
+0:07
15K
9.32 mi11:40:411:11:187:3924:39
7:56
+0:22
20K
12.43 mi12:06:051:36:427:4725:24
8:11
+0:15
Half
13.11 mi12:11:401:42:177:485:35
8:11
0:00
25K
15.53 mi12:32:562:03:337:5721:16
8:46
+0:35
30K
18.64 mi13:02:152:32:528:1229:19
9:26
+0:40
20M
20.00 mi13:16:512:47:288:2214:36
10:45
+1:19
21M
21.00 mi13:27:112:57:488:2810:20
10:20
-0:25
35K
21.75 mi13:34:553:05:328:327:44
10:20
0:00
23M
23.00 mi13:48:513:19:288:4013:56
11:08
+0:48
24M
24.00 mi13:58:413:29:188:439:50
9:50
-1:18
40K
24.85 mi14:06:463:37:238:458:05
9:27
-0:23
25.2M
25.20 mi14:10:083:40:458:463:22
9:46
+0:19
Finish
26.22 mi14:18:373:49:148:458:29
8:19
-1:27

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

7:27 /mi

Average Pace

8:45 /mi

Slowest Pace

11:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:12:02

58% of race

Time at Steady Pace

50:36

22% of race

Time at Slower Pace

46:36

20% of race

Average Pace: 8:45 /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 mi10:52:3323:107:2723:10
7:27
#11852
10K
6.21 mi11:16:0246:397:3023:29
7:34
#12196
15K
9.32 mi11:40:411:11:187:3924:39
7:56
#13311
20K
12.43 mi12:06:051:36:427:4725:24
8:11
#14092
Half
13.11 mi12:11:401:42:177:485:35
8:11
#14264
25K
15.53 mi12:32:562:03:337:5721:16
8:46
#15184
30K
18.64 mi13:02:152:32:528:1229:19
9:26
#16217
20M
20.00 mi13:16:512:47:288:2214:36
10:45
#16970
21M
21.00 mi13:27:112:57:488:2810:20
10:20
#17137
35K
21.75 mi13:34:553:05:328:327:44
10:20
#17481
23M
23.00 mi13:48:513:19:288:4013:56
11:08
#18116
24M
24.00 mi13:58:413:29:188:439:50
9:50
#18264
40K
24.85 mi14:06:463:37:238:458:05
9:27
#18291
25.2M
25.20 mi14:10:083:40:458:463:22
9:46
#18258
Finish
26.22 mi14:18:373:49:148:458:29
8:19
#18139
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi118529113911315514(Top 55%)10605(Top 66%)10605(Top 531%)
10K6.21 mi3.10 mi12196-3449256-1439256-14312639(Top 44%)9440(Top 59%)9440(Top 473%)
15K9.32 mi3.11 mi13311-11159694-4389694-43815514(Top 55%)10605(Top 66%)10605(Top 531%)
20K12.43 mi3.11 mi14092-7819997-3039997-30316142(Top 57%)10801(Top 67%)10801(Top 541%)
Half13.11 mi0.68 mi14264-17210063-6610063-6617153(Top 60%)11254(Top 70%)11254(Top 564%)
25K15.53 mi2.42 mi15184-92010427-36410427-36418776(Top 66%)11868(Top 74%)11868(Top 595%)
30K18.64 mi3.11 mi16217-103310819-39210819-39219681(Top 69%)12141(Top 75%)12141(Top 608%)
20M20.00 mi1.36 mi16970-75311099-28011099-28023045(Top 81%)13540(Top 84%)13540(Top 678%)
21M21.00 mi1.00 mi17137-16711131-3211131-3219472(Top 69%)11816(Top 73%)11816(Top 592%)
35K21.75 mi0.75 mi17481-34411253-12211253-12222774(Top 80%)13285(Top 82%)13285(Top 666%)
23M23.00 mi1.25 mi18116-63511503-25011503-25023506(Top 83%)13595(Top 84%)13595(Top 681%)
24M24.00 mi1.00 mi18264-14811550-4711550-4720819(Top 73%)12250(Top 76%)12250(Top 614%)
40K24.85 mi0.85 mi18291-2711531+1911531+1918505(Top 65%)11072(Top 69%)11072(Top 555%)
25.2M25.20 mi0.35 mi18258+3311509+2211509+2215891(Top 56%)9828(Top 61%)9828(Top 492%)
Finish26.22 mi1.02 mi18139+11911444+6511444+6515067(Top 53%)9517(Top 59%)9517(Top 477%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 55%
×21story building
+97ft-345ft

Overall

15514

Males

10605

M50-54

10605

5K→10K

3.1 - 6.2 mi

Top 44%
×5story building
+79ft-138ft

Overall

12639

Males

9440

M50-54

9440

10K→15K

6.2 - 9.3 mi

Top 55%
×3story building
+67ft-78ft

Overall

15514

Males

10605

M50-54

10605

15K→20K

9.3 - 12.4 mi

Top 57%
×5story building
+106ft-86ft

Overall

16142

Males

10801

M50-54

10801

20K→Half

12.4 - 13.1 mi

Top 60%
×2story building
+19ft-37ft

Overall

17153

Males

11254

M50-54

11254

Half→25K

13.1 - 15.5 mi

Top 66%
×4story building
+66ft-88ft

Overall

18776

Males

11868

M50-54

11868

25K→30K

15.5 - 18.6 mi

Top 69%
×9story building
+181ft-148ft

Overall

19681

Males

12141

M50-54

12141

30K→20M

18.6 - 20.0 mi

Top 81%
×5story building
+64ft-50ft

Overall

23045

Males

13540

M50-54

13540

20M→21M

20.0 - 21.0 mi

Top 69%
×8story building
+106ft-24ft

Overall

19472

Males

11816

M50-54

11816

21M→35K

21.0 - 21.8 mi

Top 80%
×7story building
+17ft-86ft

Overall

22774

Males

13285

M50-54

13285

35K→23M

21.8 - 23.0 mi

Top 83%
×5story building
+23ft-63ft

Overall

23506

Males

13595

M50-54

13595

23M→24M

23.0 - 24.0 mi

Top 73%
×6story building
+12ft-82ft

Overall

20819

Males

12250

M50-54

12250

24M→40K

24.0 - 24.9 mi

Top 65%
×1story
+6ft-20ft

Overall

18505

Males

11072

M50-54

11072

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

15891

Males

9828

M50-54

9828

25.2M→Finish

25.2 - 26.2 mi

Top 53%
×2story building
+22ft-21ft

Overall

15067

Males

9517

M50-54

9517

Passing Analysis

Category:
Athletes Passed
720
Passed By
7007
Net Change
-6287
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11852
5K → 10K128472-344#11852#12196
10K → 15K281143-1115#12196#13311
15K → 20K68849-781#13311#14092
20K → Half0172-172#14092#14264
Half → 25K36956-920#14264#15184
25K → 30K491082-1033#15184#16217
30K → 20M14767-753#16217#16970
20M → 21M74241-167#16970#17137
21M → 35K20364-344#17137#17481
35K → 23M20655-635#17481#18116
23M → 24M45193-148#18116#18264
24M → 40K5683-27#18264#18291
40K → 25.2M4411+33#18291#18258
25.2M → Finish13819+119#18258#18139
TOTALS7207007-6287
📊

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