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BOSTON MARATHON 2025

Yu Cheng Tsai

Bib: 12343•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 30%
Gender (Male)
#0 / 16105
Top 43%
Masters (Masters Men)
#0 / 10463
Top 31%
Division (M45-49)
#0 / 2386
Top 44%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:10
Rank: #11832
Start → 5K
7:27/mi
23:10 split
10K· 6.21 mi
45:29
Rank: #10491 (+1341)
5K → 10K
7:11/mi
22:19 split
15K· 9.32 mi
1:07:44
Rank: #9909 (+582)
10K → 15K
7:10/mi
22:15 split
20K· 12.43 mi
1:30:20
Rank: #9583 (+326)
15K → 20K
7:16/mi
22:36 split
Half· 13.11 mi
1:35:12
Rank: #9519 (+64)
20K → Half
7:08/mi
4:52 split
25K· 15.53 mi
1:52:58
Rank: #9327 (+192)
Half → 25K
7:20/mi
17:46 split
30K· 18.64 mi
2:16:43
Rank: #9142 (+185)
25K → 30K
7:39/mi
23:45 split
20M
2:27:08
Rank: #9016 (+126)
30K → 20M
7:40/mi
10:25 split
21M
2:35:19
Rank: #8956 (+60)
20M → 21M
8:11/mi
8:11 split
35K· 21.75 mi
2:40:49
Rank: #8855 (+101)
21M → 35K
7:21/mi
5:30 split
23M
2:50:24
Rank: #8725 (+130)
35K → 23M
7:39/mi
9:35 split
24M
2:57:49
Rank: #8600 (+125)
23M → 24M
7:25/mi
7:25 split
40K· 24.85 mi
3:04:17
Rank: #8486 (+114)
24M → 40K
7:34/mi
6:28 split
25.2M
3:07:10
Rank: #8466 (+20)
40K → 25.2M
8:22/mi
2:53 split
Finish· 26.22 mi
3:14:50
Rank: #8495 (-29)
25.2M → Finish
7:31/mi
7:40 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:35:12
Pace7:16 /mi
2nd Half
Distance13.11 mi
Time1:39:38
Pace7:36 /mi
📊Positive Split: 4.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:0423:107:2723:10
7:27
-
10K
6.21 mi11:13:2345:297:1922:19
7:11
-0:16
15K
9.32 mi11:35:381:07:447:1622:15
7:10
-0:01
20K
12.43 mi11:58:141:30:207:1622:36
7:16
+0:06
Half
13.11 mi12:03:061:35:127:164:52
7:08
-0:08
25K
15.53 mi12:20:521:52:587:1617:46
7:20
+0:12
30K
18.64 mi12:44:372:16:437:2023:45
7:39
+0:19
20M
20.00 mi12:55:022:27:087:2110:25
7:40
+0:01
21M
21.00 mi13:03:132:35:197:248:11
8:11
+0:31
35K
21.75 mi13:08:432:40:497:245:30
7:21
-0:50
23M
23.00 mi13:18:182:50:247:259:35
7:39
+0:18
24M
24.00 mi13:25:432:57:497:257:25
7:25
-0:14
40K
24.85 mi13:32:113:04:177:256:28
7:34
+0:09
25.2M
25.20 mi13:35:043:07:107:262:53
8:22
+0:48
Finish
26.22 mi13:42:443:14:507:267:40
7:31
-0:51

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

7:08 /mi

Average Pace

7:26 /mi

Slowest Pace

8:22 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:03:46

94% of race

Time at Steady Pace

11:04

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:26 /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 mi10:51:0423:107:2723:10
7:27
#11832
10K
6.21 mi11:13:2345:297:1922:19
7:11
#10491
15K
9.32 mi11:35:381:07:447:1622:15
7:10
#9909
20K
12.43 mi11:58:141:30:207:1622:36
7:16
#9583
Half
13.11 mi12:03:061:35:127:164:52
7:08
#9519
25K
15.53 mi12:20:521:52:587:1617:46
7:20
#9327
30K
18.64 mi12:44:372:16:437:2023:45
7:39
#9142
20M
20.00 mi12:55:022:27:087:2110:25
7:40
#9016
21M
21.00 mi13:03:132:35:197:248:11
8:11
#8956
35K
21.75 mi13:08:432:40:497:245:30
7:21
#8855
23M
23.00 mi13:18:182:50:247:259:35
7:39
#8725
24M
24.00 mi13:25:432:57:497:257:25
7:25
#8600
40K
24.85 mi13:32:113:04:177:256:28
7:34
#8486
25.2M
25.20 mi13:35:043:07:107:262:53
8:22
#8466
Finish
26.22 mi13:42:443:14:507:267:40
7:31
#8495
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi11832909390938783(Top 31%)7423(Top 46%)7423(Top 311%)
10K6.21 mi3.10 mi10491+13418417+6768417+6769328(Top 33%)7782(Top 48%)7782(Top 326%)
15K9.32 mi3.11 mi9909+5828081+3368081+3368783(Top 31%)7423(Top 46%)7423(Top 311%)
20K12.43 mi3.11 mi9583+3267874+2077874+2078818(Top 31%)7345(Top 46%)7345(Top 308%)
Half13.11 mi0.68 mi9519+647838+367838+368515(Top 30%)7198(Top 45%)7198(Top 302%)
25K15.53 mi2.42 mi9327+1927706+1327706+1328571(Top 30%)7093(Top 44%)7093(Top 297%)
30K18.64 mi3.11 mi9142+1857544+1627544+1628779(Top 31%)7020(Top 44%)7020(Top 294%)
20M20.00 mi1.36 mi9016+1267447+977447+978120(Top 29%)6518(Top 40%)6518(Top 273%)
21M21.00 mi1.00 mi8956+607379+687379+688456(Top 30%)6516(Top 40%)6516(Top 273%)
35K21.75 mi0.75 mi8855+1017298+817298+817548(Top 27%)6025(Top 37%)6025(Top 253%)
23M23.00 mi1.25 mi8725+1307181+1177181+1177601(Top 27%)5931(Top 37%)5931(Top 249%)
24M24.00 mi1.00 mi8600+1257076+1057076+1057136(Top 25%)5611(Top 35%)5611(Top 235%)
40K24.85 mi0.85 mi8486+1146968+1086968+1087178(Top 25%)5539(Top 34%)5539(Top 232%)
25.2M25.20 mi0.35 mi8466+206938+306938+307923(Top 28%)5864(Top 36%)5864(Top 246%)
Finish26.22 mi1.02 mi8495-296935+36935+39329(Top 33%)6615(Top 41%)6615(Top 277%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 31%
×21story building
+97ft-345ft

Overall

8783

Males

7423

M45-49

7423

5K→10K

3.1 - 6.2 mi

Top 33%
×5story building
+79ft-138ft

Overall

9328

Males

7782

M45-49

7782

10K→15K

6.2 - 9.3 mi

Top 31%
×3story building
+67ft-78ft

Overall

8783

Males

7423

M45-49

7423

15K→20K

9.3 - 12.4 mi

Top 31%
×5story building
+106ft-86ft

Overall

8818

Males

7345

M45-49

7345

20K→Half

12.4 - 13.1 mi

Top 30%
×2story building
+19ft-37ft

Overall

8515

Males

7198

M45-49

7198

Half→25K

13.1 - 15.5 mi

Top 30%
×4story building
+66ft-88ft

Overall

8571

Males

7093

M45-49

7093

25K→30K

15.5 - 18.6 mi

Top 31%
×9story building
+181ft-148ft

Overall

8779

Males

7020

M45-49

7020

30K→20M

18.6 - 20.0 mi

Top 29%
×5story building
+64ft-50ft

Overall

8120

Males

6518

M45-49

6518

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

8456

Males

6516

M45-49

6516

21M→35K

21.0 - 21.8 mi

Top 27%
×7story building
+17ft-86ft

Overall

7548

Males

6025

M45-49

6025

35K→23M

21.8 - 23.0 mi

Top 27%
×5story building
+23ft-63ft

Overall

7601

Males

5931

M45-49

5931

23M→24M

23.0 - 24.0 mi

Top 25%
×6story building
+12ft-82ft

Overall

7136

Males

5611

M45-49

5611

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

7178

Males

5539

M45-49

5539

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

7923

Males

5864

M45-49

5864

25.2M→Finish

25.2 - 26.2 mi

Top 33%
×2story building
+22ft-21ft

Overall

9329

Males

6615

M45-49

6615

Passing Analysis

Category:
Athletes Passed
3899*
Passed By
562
Net Change
+3337
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11832
5K → 10K135514+1341#11832#10491
10K → 15K597*15+582#10491#9909
15K → 20K36640+326#9909#9583
20K → Half673+64#9583#9519
Half → 25K24149+192#9519#9327
25K → 30K310125+185#9327#9142
30K → 20M16640+126#9142#9016
20M → 21M12262+60#9016#8956
21M → 35K12019+101#8956#8855
35K → 23M18050+130#8855#8725
23M → 24M14116+125#8725#8600
24M → 40K13622+114#8600#8486
40K → 25.2M4727+20#8486#8466
25.2M → Finish5180-29#8466#8495
TOTALS3899*562+3337

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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