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BOSTON MARATHON 2025

Zijin Su

Bib: 32243•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:58
Rank: #22406
Start → 5K
27:58 | 9:00/mi
10K· 6.21 mi
56:40
Rank: #22891 (-485)
5K → 10K
28:42 | 9:14/mi
15K· 9.32 mi
1:24:54
Rank: #22738 (+153)
10K → 15K
28:14 | 9:05/mi
20K· 12.43 mi
1:56:07
Rank: #23266 (-528)
15K → 20K
31:13 | 10:03/mi
Half· 13.11 mi
2:03:18
Rank: #23467 (-201)
20K → Half
7:11 | 10:32/mi
25K· 15.53 mi
2:31:29
Rank: #24103 (-636)
Half → 25K
28:11 | 11:37/mi
30K· 18.64 mi
3:11:19
Rank: #24800 (-697)
25K → 30K
39:50 | 12:49/mi
20M
3:31:20
Rank: #25190 (-390)
30K → 20M
20:01 | 14:44/mi
21M
3:47:51
Rank: #25481 (-291)
20M → 21M
16:31 | 16:31/mi
35K· 21.75 mi
3:56:40
Rank: #25473 (+8)
21M → 35K
8:49 | 11:47/mi
23M
4:12:53
Rank: #25570 (-97)
35K → 23M
16:13 | 12:57/mi
24M
4:31:47
Rank: #26039 (-469)
23M → 24M
18:54 | 18:54/mi
40K· 24.85 mi
4:46:50
Rank: #26274 (-235)
24M → 40K
15:03 | 17:36/mi
25.2M
4:53:20
Rank: #26380 (-106)
40K → 25.2M
6:30 | 18:51/mi
Finish· 26.22 mi
5:05:54
Rank: #26429 (-49)
25.2M → Finish
12:34 | 12:20/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:03:18
Pace9:24 /mi
2nd Half
Distance13.11 mi
Time3:02:36
Pace13:56 /mi
📊Positive Split: 48.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:53:4227:589:0027:58
9:00
-
10K
6.21 mi12:22:2456:409:0728:42
9:14
+0:14
15K
9.32 mi12:50:381:24:549:0728:14
9:05
-0:09
20K
12.43 mi13:21:511:56:079:2131:13
10:03
+0:58
Half
13.11 mi13:29:022:03:189:247:11
10:32
+0:29
25K
15.53 mi13:57:132:31:299:4528:11
11:37
+1:05
30K
18.64 mi14:37:033:11:1910:1639:50
12:49
+1:12
20M
20.00 mi14:57:043:31:2010:3420:01
14:44
+1:55
21M
21.00 mi15:13:353:47:5110:5116:31
16:31
+1:47
35K
21.75 mi15:22:243:56:4010:538:49
11:47
-4:44
23M
23.00 mi15:38:374:12:5311:0016:13
12:57
+1:10
24M
24.00 mi15:57:314:31:4711:1918:54
18:54
+5:57
40K
24.85 mi16:12:344:46:5011:3215:03
17:36
-1:18
25.2M
25.20 mi16:19:044:53:2011:386:30
18:51
+1:15
Finish
26.22 mi16:31:385:05:5411:4112:34
12:20
-6:31

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

9:00 /mi

Average Pace

11:41 /mi

Slowest Pace

18:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:03:18

40% of race

Time at Steady Pace

1:45:37

35% of race

Time at Slower Pace

1:16:59

25% of race

Average Pace: 11:40 /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 mi11:53:4227:589:0027:58
9:00
#22406
10K
6.21 mi12:22:2456:409:0728:42
9:14
#22891
15K
9.32 mi12:50:381:24:549:0728:14
9:05
#22738
20K
12.43 mi13:21:511:56:079:2131:13
10:03
#23266
Half
13.11 mi13:29:022:03:189:247:11
10:32
#23467
25K
15.53 mi13:57:132:31:299:4528:11
11:37
#24103
30K
18.64 mi14:37:033:11:1910:1639:50
12:49
#24800
20M
20.00 mi14:57:043:31:2010:3420:01
14:44
#25190
21M
21.00 mi15:13:353:47:5110:5116:31
16:31
#25481
35K
21.75 mi15:22:243:56:4010:538:49
11:47
#25473
23M
23.00 mi15:38:374:12:5311:0016:13
12:57
#25570
24M
24.00 mi15:57:314:31:4711:1918:54
18:54
#26039
40K
24.85 mi16:12:344:46:5011:3215:03
17:36
#26274
25.2M
25.20 mi16:19:044:53:2011:386:30
18:51
#26380
Finish
26.22 mi16:31:385:05:5411:4112:34
12:20
#26429
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi22406134871348722411(Top 79%)13571(Top 84%)13571(Top 241%)
10K6.21 mi3.10 mi22891-48513737-25013737-25023331(Top 82%)13957(Top 87%)13957(Top 247%)
15K9.32 mi3.11 mi22738+15313701+3613701+3622411(Top 79%)13571(Top 84%)13571(Top 241%)
20K12.43 mi3.11 mi23266-52813937-23613937-23624329(Top 86%)14374(Top 89%)14374(Top 255%)
Half13.11 mi0.68 mi23467-20114025-8814025-8825844(Top 91%)15043(Top 93%)15043(Top 267%)
25K15.53 mi2.42 mi24103-63614280-25514280-25526008(Top 92%)15073(Top 94%)15073(Top 267%)
30K18.64 mi3.11 mi24800-69714565-28514565-28526508(Top 93%)15216(Top 94%)15216(Top 270%)
20M20.00 mi1.36 mi25190-39014721-15614721-15627753(Top 98%)15738(Top 98%)15738(Top 279%)
21M21.00 mi1.00 mi25481-29114841-12014841-12028021(Top 99%)15882(Top 99%)15882(Top 281%)
35K21.75 mi0.75 mi25473+814832+914832+925555(Top 90%)14616(Top 91%)14616(Top 259%)
23M23.00 mi1.25 mi25570-9714864-3214864-3226321(Top 93%)14997(Top 93%)14997(Top 266%)
24M24.00 mi1.00 mi26039-46915080-21615080-21628373(Top 100%)16082(Top 100%)16082(Top 285%)
40K24.85 mi0.85 mi26274-23515164-8415164-8428297(Top 100%)16034(Top 100%)16034(Top 284%)
25.2M25.20 mi0.35 mi26380-10615215-5115215-5128299(Top 100%)16030(Top 100%)16030(Top 284%)
Finish26.22 mi1.02 mi26429-4915233-1815233-1827149(Top 96%)15388(Top 96%)15388(Top 273%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 79%
×21stories
+97ft-345ft

Overall

22411

Males

13571

M18-39

13571

5K→10K

3.1 - 6.2 mi

Top 82%
×5stories
+79ft-138ft

Overall

23331

Males

13957

M18-39

13957

10K→15K

6.2 - 9.3 mi

Top 79%
×3stories
+67ft-78ft

Overall

22411

Males

13571

M18-39

13571

15K→20K

9.3 - 12.4 mi

Top 86%
×5stories
+106ft-86ft

Overall

24329

Males

14374

M18-39

14374

20K→Half

12.4 - 13.1 mi

Top 91%
×2stories
+19ft-37ft

Overall

25844

Males

15043

M18-39

15043

Half→25K

13.1 - 15.5 mi

Top 92%
×4stories
+66ft-88ft

Overall

26008

Males

15073

M18-39

15073

25K→30K

15.5 - 18.6 mi

Top 93%
×9stories
+181ft-148ft

Overall

26508

Males

15216

M18-39

15216

30K→20M

18.6 - 20.0 mi

Top 98%
×5stories
+64ft-50ft

Overall

27753

Males

15738

M18-39

15738

20M→21M

20.0 - 21.0 mi

Top 99%
×8stories
+106ft-24ft

Overall

28021

Males

15882

M18-39

15882

21M→35K

21.0 - 21.8 mi

Top 90%
×7stories
+17ft-86ft

Overall

25555

Males

14616

M18-39

14616

35K→23M

21.8 - 23.0 mi

Top 93%
×5stories
+23ft-63ft

Overall

26321

Males

14997

M18-39

14997

23M→24M

23.0 - 24.0 mi

Top 100%
×6stories
+12ft-82ft

Overall

28373

Males

16082

M18-39

16082

24M→40K

24.0 - 24.9 mi

Top 100%
×1story
+6ft-20ft

Overall

28297

Males

16034

M18-39

16034

40K→25.2M

24.9 - 25.2 mi

Top 100%
×1story
+13ft-16ft

Overall

28299

Males

16030

M18-39

16030

25.2M→Finish

25.2 - 26.2 mi

Top 96%
×2stories
+22ft-21ft

Overall

27149

Males

15388

M18-39

15388

Passing Analysis

Category:
Athletes Passed
521
Passed By
4544
Net Change
-4023
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22406
5K → 10K93578-485#22406#22891
10K → 15K256103+153#22891#22738
15K → 20K59587-528#22738#23266
20K → Half4205-201#23266#23467
Half → 25K19655-636#23467#24103
25K → 30K21718-697#24103#24800
30K → 20M7397-390#24800#25190
20M → 21M4295-291#25190#25481
21M → 35K2416+8#25481#25473
35K → 23M23120-97#25473#25570
23M → 24M2471-469#25570#26039
24M → 40K0235-235#26039#26274
40K → 25.2M0106-106#26274#26380
25.2M → Finish958-49#26380#26429
TOTALS5214544-4023
📊

Passing Visuals

Category:

📈Position Graph

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🎨Heatmap Timeline

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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