Boston Marathon logo
BOSTON MARATHON 2025

Melisa Sejin

Bib: 19405•F

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 48%
Gender (Female)
#0 / 12228
Top 34%
Division (F18-39)
#0 / 5469
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
7:48/mi
24:14
↑ 97↓ 3451.5%
10K· 6.21 mi
7:52/mi
48:40
↑ 79↓ 1380.4%
15K· 9.32 mi
8:00/mi
1:13:31
↑ 67↓ 78
20K· 12.43 mi
8:02/mi
1:38:30
↑ 106↓ 860.1%
Half· 13.11 mi
7:58/mi
1:43:56
↑ 19↓ 370.5%
25K· 15.53 mi
8:06/mi
2:03:35
↑ 66↓ 880.2%
30K· 18.64 mi
8:17/mi
2:29:20
↑ 181↓ 1480.2%
20M
8:26/mi
2:40:47
↑ 64↓ 500.2%
21M
8:51/mi
2:49:38
↑ 106↓ 241.6%
35K· 21.75 mi
7:53/mi
2:55:32
↑ 17↓ 861.7%
23M
8:12/mi
3:05:48
↑ 23↓ 630.6%
24M
7:54/mi
3:13:42
↓ 821.3%
40K· 24.85 mi
8:07/mi
3:20:38
↓ 200.3%
25.2M
8:59/mi
3:23:44
↑ 13↓ 160.2%
Finish· 26.22 mi
8:02/mi
3:31:55
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:43:56
Pace7:56 /mi
2nd Half
Distance13.11 mi
Time1:47:59
Pace8:14 /mi
📊Positive Split: 3.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:39:1924:147:4824:14
7:48
-
10K
6.21 mi12:03:4548:407:5024:26
7:52
+0:04
15K
9.32 mi12:28:361:13:317:5324:51
8:00
+0:08
20K
12.43 mi12:53:351:38:307:5624:59
8:02
+0:02
Half
13.11 mi12:59:011:43:567:565:26
7:58
-0:04
25K
15.53 mi13:18:402:03:357:5719:39
8:06
+0:08
30K
18.64 mi13:44:252:29:208:0125:45
8:17
+0:11
20M
20.00 mi13:55:522:40:478:0211:27
8:26
+0:09
21M
21.00 mi14:04:432:49:388:058:51
8:51
+0:25
35K
21.75 mi14:10:372:55:328:045:54
7:53
-0:58
23M
23.00 mi14:20:533:05:488:0510:16
8:12
+0:19
24M
24.00 mi14:28:473:13:428:047:54
7:54
-0:18
40K
24.85 mi14:35:433:20:388:046:56
8:07
+0:13
25.2M
25.20 mi14:38:493:23:448:053:06
8:59
+0:52
Finish
26.22 mi14:47:003:31:558:058:11
8:02
-0:57

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

7:48 /mi

Average Pace

8:05 /mi

Slowest Pace

8:59 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:19:58

94% of race

Time at Steady Pace

11:57

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:05 /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 mi11:39:1924:147:4824:14
7:48
#14822
10K
6.21 mi12:03:4548:407:5024:26
7:52
#15076
15K
9.32 mi12:28:361:13:317:5324:51
8:00
#15392
20K
12.43 mi12:53:351:38:307:5624:59
8:02
#15337
Half
13.11 mi12:59:011:43:567:565:26
7:58
#15344
25K
15.53 mi13:18:402:03:357:5719:39
8:06
#15206
30K
18.64 mi13:44:252:29:208:0125:45
8:17
#14829
20M
20.00 mi13:55:522:40:478:0211:27
8:26
#14660
21M
21.00 mi14:04:432:49:388:058:51
8:51
#14482
35K
21.75 mi14:10:372:55:328:045:54
7:53
#14371
23M
23.00 mi14:20:533:05:488:0510:16
8:12
#14168
24M
24.00 mi14:28:473:13:428:047:54
7:54
#13983
40K
24.85 mi14:35:433:20:388:046:56
8:07
#13820
25.2M
25.20 mi14:38:493:23:448:053:06
8:59
#13771
Finish
26.22 mi14:47:003:31:558:058:11
8:02
#13723
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi148224419441916048(Top 56%)5165(Top 42%)5165(Top 94%)
10K6.21 mi3.10 mi15076-2544586-1674586-16715398(Top 54%)4778(Top 39%)4778(Top 87%)
15K9.32 mi3.11 mi15392-3164781-1954781-19516048(Top 56%)5165(Top 42%)5165(Top 94%)
20K12.43 mi3.11 mi15337+554771+104771+1015224(Top 54%)4763(Top 39%)4763(Top 87%)
Half13.11 mi0.68 mi15344-74775-44775-415628(Top 55%)4948(Top 40%)4948(Top 90%)
25K15.53 mi2.42 mi15206+1384725+504725+5014682(Top 52%)4576(Top 37%)4576(Top 84%)
30K18.64 mi3.11 mi14829+3774581+1444581+14413433(Top 47%)4073(Top 33%)4073(Top 74%)
20M20.00 mi1.36 mi14660+1694507+744507+7413327(Top 47%)4151(Top 34%)4151(Top 76%)
21M21.00 mi1.00 mi14482+1784426+814426+8112637(Top 44%)3947(Top 32%)3947(Top 72%)
35K21.75 mi0.75 mi14371+1114379+474379+4711532(Top 41%)3404(Top 28%)3404(Top 62%)
23M23.00 mi1.25 mi14168+2034322+574322+5711390(Top 40%)3436(Top 28%)3436(Top 63%)
24M24.00 mi1.00 mi13983+1854255+674255+6710596(Top 37%)3107(Top 25%)3107(Top 57%)
40K24.85 mi0.85 mi13820+1634195+604195+6010992(Top 39%)3409(Top 28%)3409(Top 62%)
25.2M25.20 mi0.35 mi13771+494179+164179+1611813(Top 42%)3889(Top 32%)3889(Top 71%)
Finish26.22 mi1.02 mi13723+484173+64173+613104(Top 46%)4492(Top 37%)4492(Top 82%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 56%
×21story building
+97ft-345ft

Overall

16048

Females

5165

F18-39

5165

5K→10K

3.1 - 6.2 mi

Top 54%
×5story building
+79ft-138ft

Overall

15398

Females

4778

F18-39

4778

10K→15K

6.2 - 9.3 mi

Top 56%
×3story building
+67ft-78ft

Overall

16048

Females

5165

F18-39

5165

15K→20K

9.3 - 12.4 mi

Top 54%
×5story building
+106ft-86ft

Overall

15224

Females

4763

F18-39

4763

20K→Half

12.4 - 13.1 mi

Top 55%
×2story building
+19ft-37ft

Overall

15628

Females

4948

F18-39

4948

Half→25K

13.1 - 15.5 mi

Top 52%
×4story building
+66ft-88ft

Overall

14682

Females

4576

F18-39

4576

25K→30K

15.5 - 18.6 mi

Top 47%
×9story building
+181ft-148ft

Overall

13433

Females

4073

F18-39

4073

30K→20M

18.6 - 20.0 mi

Top 47%
×5story building
+64ft-50ft

Overall

13327

Females

4151

F18-39

4151

20M→21M

20.0 - 21.0 mi

Top 44%
×8story building
+106ft-24ft

Overall

12637

Females

3947

F18-39

3947

21M→35K

21.0 - 21.8 mi

Top 41%
×7story building
+17ft-86ft

Overall

11532

Females

3404

F18-39

3404

35K→23M

21.8 - 23.0 mi

Top 40%
×5story building
+23ft-63ft

Overall

11390

Females

3436

F18-39

3436

23M→24M

23.0 - 24.0 mi

Top 37%
×6story building
+12ft-82ft

Overall

10596

Females

3107

F18-39

3107

24M→40K

24.0 - 24.9 mi

Top 39%
×1story
+6ft-20ft

Overall

10992

Females

3409

F18-39

3409

40K→25.2M

24.9 - 25.2 mi

Top 42%
×1story
+13ft-16ft

Overall

11813

Females

3889

F18-39

3889

25.2M→Finish

25.2 - 26.2 mi

Top 46%
×2story building
+22ft-21ft

Overall

13104

Females

4492

F18-39

4492

Passing Analysis

Category:
Athletes Passed
2558
Passed By
1459
Net Change
+1099
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14822
5K → 10K193447-254#14822#15076
10K → 15K117433-316#15076#15392
15K → 20K229174+55#15392#15337
20K → Half3643-7#15337#15344
Half → 25K23799+138#15344#15206
25K → 30K45073+377#15206#14829
30K → 20M21445+169#14829#14660
20M → 21M20931+178#14660#14482
21M → 35K12413+111#14482#14371
35K → 23M22724+203#14371#14168
23M → 24M1949+185#14168#13983
24M → 40K18320+163#13983#13820
40K → 25.2M589+49#13820#13771
25.2M → Finish8739+48#13771#13723
TOTALS25581459+1099
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing