Boston Marathon logo
BOSTON MARATHON 2025

Mathias Sierens

Bib: 29402•M

0:00
0:00
/ mi
Be the first to cheer!
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
24:00
Rank: #14176
Start → 5K
24:00 | 7:43/mi
10K· 6.21 mi
47:30
Rank: #13434 (+742)
5K → 10K
23:30 | 7:34/mi
15K· 9.32 mi
1:11:29
Rank: #13484 (-50)
10K → 15K
23:59 | 7:43/mi
20K· 12.43 mi
1:36:19
Rank: #13803 (-319)
15K → 20K
24:50 | 8:00/mi
Half· 13.11 mi
1:41:41
Rank: #13866 (-63)
20K → Half
5:22 | 7:52/mi
25K· 15.53 mi
2:01:23
Rank: #13992 (-126)
Half → 25K
19:42 | 8:08/mi
30K· 18.64 mi
2:28:07
Rank: #14243 (-251)
25K → 30K
26:44 | 8:36/mi
20M
2:39:46
Rank: #14222 (+21)
30K → 20M
11:39 | 8:34/mi
21M
2:49:29
Rank: #14433 (-211)
20M → 21M
9:43 | 9:43/mi
35K· 21.75 mi
2:57:12
Rank: #14925 (-492)
21M → 35K
7:43 | 10:19/mi
23M
3:09:55
Rank: #15439 (-514)
35K → 23M
12:43 | 10:09/mi
24M
3:19:24
Rank: #15628 (-189)
23M → 24M
9:29 | 9:29/mi
40K· 24.85 mi
3:27:31
Rank: #15734 (-106)
24M → 40K
8:07 | 9:30/mi
25.2M
3:31:20
Rank: #15850 (-116)
40K → 25.2M
3:49 | 11:04/mi
Finish· 26.22 mi
3:40:14
Rank: #15923 (-73)
25.2M → Finish
8:54 | 8:44/mi

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
Time1:41:41
Pace7:45 /mi
2nd Half
Distance13.11 mi
Time1:58:33
Pace9:03 /mi
📊Positive Split: 16.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:4024:007:4324:00
7:43
-
10K
6.21 mi12:10:1047:307:3923:30
7:34
-0:09
15K
9.32 mi12:34:091:11:297:4023:59
7:43
+0:09
20K
12.43 mi12:58:591:36:197:4524:50
8:00
+0:17
Half
13.11 mi13:04:211:41:417:455:22
7:52
-0:08
25K
15.53 mi13:24:032:01:237:4919:42
8:08
+0:16
30K
18.64 mi13:50:472:28:077:5726:44
8:36
+0:28
20M
20.00 mi14:02:262:39:467:5911:39
8:34
-0:02
21M
21.00 mi14:12:092:49:298:049:43
9:43
+1:09
35K
21.75 mi14:19:522:57:128:097:43
10:19
+0:36
23M
23.00 mi14:32:353:09:558:1512:43
10:09
-0:10
24M
24.00 mi14:42:043:19:248:199:29
9:29
-0:40
40K
24.85 mi14:50:113:27:318:218:07
9:30
+0:01
25.2M
25.20 mi14:54:003:31:208:233:49
11:04
+1:34
Finish
26.22 mi15:02:543:40:148:248:54
8:44
-2:20

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

7:34 /mi

Average Pace

8:24 /mi

Slowest Pace

11:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:41:41

46% of race

Time at Steady Pace

1:06:59

30% of race

Time at Slower Pace

51:34

23% of race

Average Pace: 8:24 /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 mi11:46:4024:007:4324:00
7:43
#14176
10K
6.21 mi12:10:1047:307:3923:30
7:34
#13434
15K
9.32 mi12:34:091:11:297:4023:59
7:43
#13484
20K
12.43 mi12:58:591:36:197:4524:50
8:00
#13803
Half
13.11 mi13:04:211:41:417:455:22
7:52
#13866
25K
15.53 mi13:24:032:01:237:4919:42
8:08
#13992
30K
18.64 mi13:50:472:28:077:5726:44
8:36
#14243
20M
20.00 mi14:02:262:39:467:5911:39
8:34
#14222
21M
21.00 mi14:12:092:49:298:049:43
9:43
#14433
35K
21.75 mi14:19:522:57:128:097:43
10:19
#14925
23M
23.00 mi14:32:353:09:558:1512:43
10:09
#15439
24M
24.00 mi14:42:043:19:248:199:29
9:29
#15628
40K
24.85 mi14:50:113:27:318:218:07
9:30
#15734
25.2M
25.20 mi14:54:003:31:208:233:49
11:04
#15850
Finish
26.22 mi15:02:543:40:148:248:54
8:44
#15923
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi14176101191011913686(Top 48%)9812(Top 61%)9812(Top 174%)
10K6.21 mi3.10 mi13434+7429789+3309789+33012693(Top 45%)9466(Top 59%)9466(Top 168%)
15K9.32 mi3.11 mi13484-509765+249765+2413686(Top 48%)9812(Top 61%)9812(Top 174%)
20K12.43 mi3.11 mi13803-3199862-979862-9714874(Top 52%)10254(Top 64%)10254(Top 182%)
Half13.11 mi0.68 mi13866-639886-249886-2414778(Top 52%)10253(Top 64%)10253(Top 182%)
25K15.53 mi2.42 mi13992-1269910-249910-2414795(Top 52%)10114(Top 63%)10114(Top 179%)
30K18.64 mi3.11 mi14243-2519956-469956-4615414(Top 54%)10240(Top 64%)10240(Top 181%)
20M20.00 mi1.36 mi14222+219924+329924+3214242(Top 50%)9575(Top 59%)9575(Top 170%)
21M21.00 mi1.00 mi14433-2119997-739997-7317087(Top 60%)10732(Top 67%)10732(Top 190%)
35K21.75 mi0.75 mi14925-49210188-19110188-19122705(Top 80%)13247(Top 82%)13247(Top 235%)
23M23.00 mi1.25 mi15439-51410358-17010358-17020974(Top 74%)12375(Top 77%)12375(Top 219%)
24M24.00 mi1.00 mi15628-18910415-5710415-5719561(Top 69%)11646(Top 72%)11646(Top 206%)
40K24.85 mi0.85 mi15734-10610442-2710442-2718665(Top 66%)11150(Top 69%)11150(Top 198%)
25.2M25.20 mi0.35 mi15850-11610475-3310475-3320797(Top 73%)12173(Top 76%)12173(Top 216%)
Finish26.22 mi1.02 mi15923-7310491-1610491-1617652(Top 62%)10705(Top 66%)10705(Top 190%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 48%
×21stories
+97ft-345ft

Overall

13686

Males

9812

M18-39

9812

5K→10K

3.1 - 6.2 mi

Top 45%
×5stories
+79ft-138ft

Overall

12693

Males

9466

M18-39

9466

10K→15K

6.2 - 9.3 mi

Top 48%
×3stories
+67ft-78ft

Overall

13686

Males

9812

M18-39

9812

15K→20K

9.3 - 12.4 mi

Top 52%
×5stories
+106ft-86ft

Overall

14874

Males

10254

M18-39

10254

20K→Half

12.4 - 13.1 mi

Top 52%
×2stories
+19ft-37ft

Overall

14778

Males

10253

M18-39

10253

Half→25K

13.1 - 15.5 mi

Top 52%
×4stories
+66ft-88ft

Overall

14795

Males

10114

M18-39

10114

25K→30K

15.5 - 18.6 mi

Top 54%
×9stories
+181ft-148ft

Overall

15414

Males

10240

M18-39

10240

30K→20M

18.6 - 20.0 mi

Top 50%
×5stories
+64ft-50ft

Overall

14242

Males

9575

M18-39

9575

20M→21M

20.0 - 21.0 mi

Top 60%
×8stories
+106ft-24ft

Overall

17087

Males

10732

M18-39

10732

21M→35K

21.0 - 21.8 mi

Top 80%
×7stories
+17ft-86ft

Overall

22705

Males

13247

M18-39

13247

35K→23M

21.8 - 23.0 mi

Top 74%
×5stories
+23ft-63ft

Overall

20974

Males

12375

M18-39

12375

23M→24M

23.0 - 24.0 mi

Top 69%
×6stories
+12ft-82ft

Overall

19561

Males

11646

M18-39

11646

24M→40K

24.0 - 24.9 mi

Top 66%
×1story
+6ft-20ft

Overall

18665

Males

11150

M18-39

11150

40K→25.2M

24.9 - 25.2 mi

Top 73%
×1story
+13ft-16ft

Overall

20797

Males

12173

M18-39

12173

25.2M→Finish

25.2 - 26.2 mi

Top 62%
×2stories
+22ft-21ft

Overall

17652

Males

10705

M18-39

10705

Passing Analysis

Category:
Athletes Passed
1798
Passed By
3545
Net Change
-1747
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14176
5K → 10K80159+742#14176#13434
10K → 15K191241-50#13434#13484
15K → 20K118437-319#13484#13803
20K → Half1780-63#13803#13866
Half → 25K135261-126#13866#13992
25K → 30K192443-251#13992#14243
30K → 20M11695+21#14243#14222
20M → 21M62273-211#14222#14433
21M → 35K10502-492#14433#14925
35K → 23M31545-514#14925#15439
23M → 24M18207-189#15439#15628
24M → 40K52158-106#15628#15734
40K → 25.2M10126-116#15734#15850
25.2M → Finish45118-73#15850#15923
TOTALS17983545-1747
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing