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BOSTON MARATHON 2025

Chang Zuo

Bib: 10579•M

NC

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 36%
Gender (Male)
#0 / 16105
Top 49%
Masters (Masters Men)
#0 / 10463
Top 38%
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:10
Rank: #8917
Start → 5K
7:08/mi
22:10 split
10K· 6.21 mi
44:21
Rank: #8925 (-8)
5K → 10K
7:08/mi
22:11 split
15K· 9.32 mi
1:06:50
Rank: #9068 (-143)
10K → 15K
7:14/mi
22:29 split
20K· 12.43 mi
1:29:34
Rank: #9051 (+17)
15K → 20K
7:19/mi
22:44 split
Half· 13.11 mi
1:34:26
Rank: #9016 (+35)
20K → Half
7:08/mi
4:52 split
25K· 15.53 mi
1:52:32
Rank: #9065 (-49)
Half → 25K
7:28/mi
18:06 split
30K· 18.64 mi
2:17:51
Rank: #9655 (-590)
25K → 30K
8:09/mi
25:19 split
20M
2:29:07
Rank: #9840 (-185)
30K → 20M
8:17/mi
11:16 split
21M
2:37:40
Rank: #9857 (-17)
20M → 21M
8:33/mi
8:33 split
35K· 21.75 mi
2:44:01
Rank: #10101 (-244)
21M → 35K
8:29/mi
6:21 split
23M
2:54:14
Rank: #10146 (-45)
35K → 23M
8:10/mi
10:13 split
24M
3:02:27
Rank: #10231 (-85)
23M → 24M
8:13/mi
8:13 split
40K· 24.85 mi
3:09:35
Rank: #10299 (-68)
24M → 40K
8:21/mi
7:08 split
25.2M
3:12:41
Rank: #10316 (-17)
40K → 25.2M
8:59/mi
3:06 split
Finish· 26.22 mi
3:20:38
Rank: #10324 (-8)
25.2M → Finish
7:48/mi
7:57 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:34:26
Pace7:12 /mi
2nd Half
Distance13.11 mi
Time1:46:12
Pace8:06 /mi
📊Positive Split: 12.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:0422:107:0822:10
7:08
-
10K
6.21 mi11:10:1544:217:0822:11
7:08
0:00
15K
9.32 mi11:32:441:06:507:1022:29
7:14
+0:06
20K
12.43 mi11:55:281:29:347:1222:44
7:19
+0:05
Half
13.11 mi12:00:201:34:267:124:52
7:08
-0:11
25K
15.53 mi12:18:261:52:327:1518:06
7:28
+0:20
30K
18.64 mi12:43:452:17:517:2425:19
8:09
+0:41
20M
20.00 mi12:55:012:29:077:2711:16
8:17
+0:08
21M
21.00 mi13:03:342:37:407:308:33
8:33
+0:16
35K
21.75 mi13:09:552:44:017:336:21
8:29
-0:04
23M
23.00 mi13:20:082:54:147:3510:13
8:10
-0:19
24M
24.00 mi13:28:213:02:277:368:13
8:13
+0:03
40K
24.85 mi13:35:293:09:357:387:08
8:21
+0:08
25.2M
25.20 mi13:38:353:12:417:393:06
8:59
+0:38
Finish
26.22 mi13:46:323:20:387:397:57
7:48
-1:11

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

7:39 /mi

Slowest Pace

8:59 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:00:29

60% of race

Time at Steady Pace

1:02:09

31% of race

Time at Slower Pace

18:00

9% of race

Average Pace: 7:39 /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 mi10:48:0422:107:0822:10
7:08
#8917
10K
6.21 mi11:10:1544:217:0822:11
7:08
#8925
15K
9.32 mi11:32:441:06:507:1022:29
7:14
#9068
20K
12.43 mi11:55:281:29:347:1222:44
7:19
#9051
Half
13.11 mi12:00:201:34:267:124:52
7:08
#9016
25K
15.53 mi12:18:261:52:327:1518:06
7:28
#9065
30K
18.64 mi12:43:452:17:517:2425:19
8:09
#9655
20M
20.00 mi12:55:012:29:077:2711:16
8:17
#9840
21M
21.00 mi13:03:342:37:407:308:33
8:33
#9857
35K
21.75 mi13:09:552:44:017:336:21
8:29
#10101
23M
23.00 mi13:20:082:54:147:3510:13
8:10
#10146
24M
24.00 mi13:28:213:02:277:368:13
8:13
#10231
40K
24.85 mi13:35:293:09:357:387:08
8:21
#10299
25.2M
25.20 mi13:38:353:12:417:393:06
8:59
#10316
Finish
26.22 mi13:46:323:20:387:397:57
7:48
#10324
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi8917756375639427(Top 33%)7785(Top 48%)7785(Top 326%)
10K6.21 mi3.10 mi8925-87547+167547+168995(Top 32%)7601(Top 47%)7601(Top 319%)
15K9.32 mi3.11 mi9068-1437620-737620-739427(Top 33%)7785(Top 48%)7785(Top 326%)
20K12.43 mi3.11 mi9051+177592+287592+289184(Top 32%)7556(Top 47%)7556(Top 317%)
Half13.11 mi0.68 mi9016+357572+207572+208548(Top 30%)7231(Top 45%)7231(Top 303%)
25K15.53 mi2.42 mi9065-497565+77565+79676(Top 34%)7687(Top 48%)7687(Top 322%)
30K18.64 mi3.11 mi9655-5907822-2577822-25712411(Top 44%)8866(Top 55%)8866(Top 372%)
20M20.00 mi1.36 mi9840-1857901-797901-7912395(Top 44%)8714(Top 54%)8714(Top 365%)
21M21.00 mi1.00 mi9857-177873+287873+2810774(Top 38%)7754(Top 48%)7754(Top 325%)
35K21.75 mi0.75 mi10101-2447956-837956-8315340(Top 54%)9856(Top 61%)9856(Top 413%)
23M23.00 mi1.25 mi10146-457938+187938+1811097(Top 39%)7792(Top 48%)7792(Top 327%)
24M24.00 mi1.00 mi10231-857948-107948-1012651(Top 45%)8477(Top 53%)8477(Top 355%)
40K24.85 mi0.85 mi10299-687947+17947+112382(Top 44%)8222(Top 51%)8222(Top 345%)
25.2M25.20 mi0.35 mi10316-177941+67941+611682(Top 41%)7816(Top 49%)7816(Top 328%)
Finish26.22 mi1.02 mi10324-87912+297912+2911420(Top 40%)7715(Top 48%)7715(Top 323%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 33%
×21story building
+97ft-345ft

Overall

9427

Males

7785

M45-49

7785

5K→10K

3.1 - 6.2 mi

Top 32%
×5story building
+79ft-138ft

Overall

8995

Males

7601

M45-49

7601

10K→15K

6.2 - 9.3 mi

Top 33%
×3story building
+67ft-78ft

Overall

9427

Males

7785

M45-49

7785

15K→20K

9.3 - 12.4 mi

Top 32%
×5story building
+106ft-86ft

Overall

9184

Males

7556

M45-49

7556

20K→Half

12.4 - 13.1 mi

Top 30%
×2story building
+19ft-37ft

Overall

8548

Males

7231

M45-49

7231

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

9676

Males

7687

M45-49

7687

25K→30K

15.5 - 18.6 mi

Top 44%
×9story building
+181ft-148ft

Overall

12411

Males

8866

M45-49

8866

30K→20M

18.6 - 20.0 mi

Top 44%
×5story building
+64ft-50ft

Overall

12395

Males

8714

M45-49

8714

20M→21M

20.0 - 21.0 mi

Top 38%
×8story building
+106ft-24ft

Overall

10774

Males

7754

M45-49

7754

21M→35K

21.0 - 21.8 mi

Top 54%
×7story building
+17ft-86ft

Overall

15340

Males

9856

M45-49

9856

35K→23M

21.8 - 23.0 mi

Top 39%
×5story building
+23ft-63ft

Overall

11097

Males

7792

M45-49

7792

23M→24M

23.0 - 24.0 mi

Top 45%
×6story building
+12ft-82ft

Overall

12651

Males

8477

M45-49

8477

24M→40K

24.0 - 24.9 mi

Top 44%
×1story
+6ft-20ft

Overall

12382

Males

8222

M45-49

8222

40K→25.2M

24.9 - 25.2 mi

Top 41%
×1story
+13ft-16ft

Overall

11682

Males

7816

M45-49

7816

25.2M→Finish

25.2 - 26.2 mi

Top 40%
×2story building
+22ft-21ft

Overall

11420

Males

7715

M45-49

7715

Passing Analysis

Category:
Athletes Passed
1276
Passed By
2680
Net Change
-1407
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8917
5K → 10K210218-8#8917#8925
10K → 15K112255-143#8925#9068
15K → 20K172155+17#9068#9051
20K → Half5318+35#9051#9016
Half → 25K145194-49#9016#9065
25K → 30K93683-590#9065#9655
30K → 20M62246-185#9655#9840
20M → 21M96113-17#9840#9857
21M → 35K24266-244#9857#10101
35K → 23M90135-45#10101#10146
23M → 24M59144-85#10146#10231
24M → 40K63131-68#10231#10299
40K → 25.2M2340-17#10299#10316
25.2M → Finish7482-8#10316#10324
TOTALS12762680-1407
📊

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