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BOSTON MARATHON 2025

Molly Sun

Bib: 28557•F

NC

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0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Division (F18-39)
#0 / 5469
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
29:43
Rank: #24450
Start → 5K
9:34/mi
29:43 split
10K· 6.21 mi
1:00:05
Rank: #24659 (-209)
5K → 10K
9:46/mi
30:22 split
15K· 9.32 mi
1:32:38
Rank: #25138 (-479)
10K → 15K
10:29/mi
32:33 split
20K· 12.43 mi
2:10:08
Rank: #25922 (-784)
15K → 20K
12:04/mi
37:30 split
Half· 13.11 mi
2:17:30
Rank: #25930 (-8)
20K → Half
10:48/mi
7:22 split
25K· 15.53 mi
2:50:06
Rank: #26427 (-497)
Half → 25K
13:27/mi
32:36 split
30K· 18.64 mi
3:36:42
Rank: #26931 (-504)
25K → 30K
15:00/mi
46:36 split
20M
3:57:50
Rank: #27077 (-146)
30K → 20M
15:33/mi
21:08 split
21M
4:14:48
Rank: #27185 (-108)
20M → 21M
16:58/mi
16:58 split
35K· 21.75 mi
4:27:33
Rank: #27328 (-143)
21M → 35K
17:03/mi
12:45 split
23M
4:47:28
Rank: #27436 (-108)
35K → 23M
15:54/mi
19:55 split
24M
5:01:32
Rank: #27464 (-28)
23M → 24M
14:04/mi
14:04 split
40K· 24.85 mi
5:15:15
Rank: #27508 (-44)
24M → 40K
16:03/mi
13:43 split
25.2M
5:20:06
Rank: #27496 (+12)
40K → 25.2M
14:04/mi
4:51 split
Finish· 26.22 mi
5:31:49
Rank: #27477 (+19)
25.2M → Finish
11:30/mi
11:43 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:17:30
Pace10:29 /mi
2nd Half
Distance13.11 mi
Time3:14:19
Pace14:49 /mi
📊Positive Split: 41.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:4629:439:3429:43
9:34
-
10K
6.21 mi12:17:081:00:059:4030:22
9:46
+0:12
15K
9.32 mi12:49:411:32:389:5632:33
10:29
+0:43
20K
12.43 mi13:27:112:10:0810:2837:30
12:04
+1:35
Half
13.11 mi13:34:332:17:3010:297:22
10:48
-1:16
25K
15.53 mi14:07:092:50:0610:5732:36
13:27
+2:39
30K
18.64 mi14:53:453:36:4211:3746:36
15:00
+1:33
20M
20.00 mi15:14:533:57:5011:5321:08
15:33
+0:33
21M
21.00 mi15:31:514:14:4812:0816:58
16:58
+1:25
35K
21.75 mi15:44:364:27:3312:1812:45
17:03
+0:05
23M
23.00 mi16:04:314:47:2812:3019:55
15:54
-1:09
24M
24.00 mi16:18:355:01:3212:3414:04
14:04
-1:50
40K
24.85 mi16:32:185:15:1512:4113:43
16:03
+1:59
25.2M
25.20 mi16:37:095:20:0612:424:51
14:04
-1:59
Finish
26.22 mi16:48:525:31:4912:4011:43
11:30
-2:34

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

9:34 /mi

Average Pace

12:40 /mi

Slowest Pace

17:03 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:29:13

45% of race

Time at Steady Pace

1:38:07

30% of race

Time at Slower Pace

1:24:29

25% of race

Average Pace: 12:39 /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 mi11:46:4629:439:3429:43
9:34
#24450
10K
6.21 mi12:17:081:00:059:4030:22
9:46
#24659
15K
9.32 mi12:49:411:32:389:5632:33
10:29
#25138
20K
12.43 mi13:27:112:10:0810:2837:30
12:04
#25922
Half
13.11 mi13:34:332:17:3010:297:22
10:48
#25930
25K
15.53 mi14:07:092:50:0610:5732:36
13:27
#26427
30K
18.64 mi14:53:453:36:4211:3746:36
15:00
#26931
20M
20.00 mi15:14:533:57:5011:5321:08
15:33
#27077
21M
21.00 mi15:31:514:14:4812:0816:58
16:58
#27185
35K
21.75 mi15:44:364:27:3312:1812:45
17:03
#27328
23M
23.00 mi16:04:314:47:2812:3019:55
15:54
#27436
24M
24.00 mi16:18:355:01:3212:3414:04
14:04
#27464
40K
24.85 mi16:32:185:15:1512:4113:43
16:03
#27508
25.2M
25.20 mi16:37:095:20:0612:424:51
14:04
#27496
Finish
26.22 mi16:48:525:31:4912:4011:43
11:30
#27477
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi244509937993725889(Top 91%)10734(Top 88%)10734(Top 196%)
10K6.21 mi3.10 mi24659-20910039-10210039-10224783(Top 87%)10113(Top 83%)10113(Top 185%)
15K9.32 mi3.11 mi25138-47910301-26210301-26225889(Top 91%)10734(Top 88%)10734(Top 196%)
20K12.43 mi3.11 mi25922-78410748-44710748-44727175(Top 96%)11502(Top 94%)11502(Top 210%)
Half13.11 mi0.68 mi25930-810751-310751-326237(Top 92%)10967(Top 90%)10967(Top 201%)
25K15.53 mi2.42 mi26427-49711033-28211033-28227584(Top 97%)11762(Top 96%)11762(Top 215%)
30K18.64 mi3.11 mi26931-50411353-32011353-32028032(Top 99%)12068(Top 99%)12068(Top 221%)
20M20.00 mi1.36 mi27077-14611449-9611449-9628056(Top 99%)12083(Top 99%)12083(Top 221%)
21M21.00 mi1.00 mi27185-10811519-7011519-7028141(Top 99%)12121(Top 99%)12121(Top 222%)
35K21.75 mi0.75 mi27328-14311614-9511614-9528314(Top 100%)12197(Top 100%)12197(Top 223%)
23M23.00 mi1.25 mi27436-10811683-6911683-6928129(Top 99%)12139(Top 99%)12139(Top 222%)
24M24.00 mi1.00 mi27464-2811704-2111704-2127682(Top 97%)11978(Top 98%)11978(Top 219%)
40K24.85 mi0.85 mi27508-4411730-2611730-2628109(Top 99%)12133(Top 99%)12133(Top 222%)
25.2M25.20 mi0.35 mi27496+1211726+411726+426337(Top 93%)11358(Top 93%)11358(Top 208%)
Finish26.22 mi1.02 mi27477+1911720+611720+626127(Top 92%)11213(Top 92%)11213(Top 205%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 91%
×21stories
+97ft-345ft

Overall

25889

Females

10734

F18-39

10734

5K→10K

3.1 - 6.2 mi

Top 87%
×5stories
+79ft-138ft

Overall

24783

Females

10113

F18-39

10113

10K→15K

6.2 - 9.3 mi

Top 91%
×3stories
+67ft-78ft

Overall

25889

Females

10734

F18-39

10734

15K→20K

9.3 - 12.4 mi

Top 96%
×5stories
+106ft-86ft

Overall

27175

Females

11502

F18-39

11502

20K→Half

12.4 - 13.1 mi

Top 92%
×2stories
+19ft-37ft

Overall

26237

Females

10967

F18-39

10967

Half→25K

13.1 - 15.5 mi

Top 97%
×4stories
+66ft-88ft

Overall

27584

Females

11762

F18-39

11762

25K→30K

15.5 - 18.6 mi

Top 99%
×9stories
+181ft-148ft

Overall

28032

Females

12068

F18-39

12068

30K→20M

18.6 - 20.0 mi

Top 99%
×5stories
+64ft-50ft

Overall

28056

Females

12083

F18-39

12083

20M→21M

20.0 - 21.0 mi

Top 99%
×8stories
+106ft-24ft

Overall

28141

Females

12121

F18-39

12121

21M→35K

21.0 - 21.8 mi

Top 100%
×7stories
+17ft-86ft

Overall

28314

Females

12197

F18-39

12197

35K→23M

21.8 - 23.0 mi

Top 99%
×5stories
+23ft-63ft

Overall

28129

Females

12139

F18-39

12139

23M→24M

23.0 - 24.0 mi

Top 97%
×6stories
+12ft-82ft

Overall

27682

Females

11978

F18-39

11978

24M→40K

24.0 - 24.9 mi

Top 99%
×1story
+6ft-20ft

Overall

28109

Females

12133

F18-39

12133

40K→25.2M

24.9 - 25.2 mi

Top 93%
×1story
+13ft-16ft

Overall

26337

Females

11358

F18-39

11358

25.2M→Finish

25.2 - 26.2 mi

Top 92%
×2stories
+22ft-21ft

Overall

26127

Females

11213

F18-39

11213

Passing Analysis

Category:
Athletes Passed
284
Passed By
3311
Net Change
-3027
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#24450
5K → 10K132341-209#24450#24659
10K → 15K34513-479#24659#25138
15K → 20K9793-784#25138#25922
20K → Half1826-8#25922#25930
Half → 25K6503-497#25930#26427
25K → 30K11515-504#26427#26931
30K → 20M5151-146#26931#27077
20M → 21M4112-108#27077#27185
21M → 35K2145-143#27185#27328
35K → 23M4112-108#27328#27436
23M → 24M1442-28#27436#27464
24M → 40K650-44#27464#27508
40K → 25.2M142+12#27508#27496
25.2M → Finish256+19#27496#27477
TOTALS2843311-3027
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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