Boston Marathon logo
BOSTON MARATHON 2025

Serge Mackaaij

Bib: 12623•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Top 43%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Top 45%
Division (M55-59)
#0 / 1648
Top 31%
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
7:27/mi
23:08
↑ 97↓ 3451.5%
10K· 6.21 mi
7:43/mi
47:05
↑ 79↓ 1380.4%
15K· 9.32 mi
7:52/mi
1:11:31
↑ 67↓ 78
20K· 12.43 mi
7:53/mi
1:36:00
↑ 106↓ 860.1%
Half· 13.11 mi
7:42/mi
1:41:15
↑ 19↓ 370.5%
25K· 15.53 mi
7:50/mi
2:00:15
↑ 66↓ 880.2%
30K· 18.64 mi
8:06/mi
2:25:26
↑ 181↓ 1480.2%
20M
8:06/mi
2:36:26
↑ 64↓ 500.2%
21M
8:26/mi
2:44:52
↑ 106↓ 241.6%
35K· 21.75 mi
7:29/mi
2:50:28
↑ 17↓ 861.7%
23M
7:57/mi
3:00:25
↑ 23↓ 630.6%
24M
7:52/mi
3:08:17
↓ 821.3%
40K· 24.85 mi
8:07/mi
3:15:13
↓ 200.3%
25.2M
9:05/mi
3:18:21
↑ 13↓ 160.2%
Finish· 26.22 mi
7:56/mi
3:26:26
↑ 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
Time1:41:15
Pace7:43 /mi
2nd Half
Distance13.11 mi
Time1:45:11
Pace8:01 /mi
📊Positive Split: 3.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:4123:087:2723:08
7:27
-
10K
6.21 mi11:15:3847:057:3523:57
7:43
+0:16
15K
9.32 mi11:40:041:11:317:4024:26
7:52
+0:09
20K
12.43 mi12:04:331:36:007:4324:29
7:53
+0:01
Half
13.11 mi12:09:481:41:157:435:15
7:42
-0:11
25K
15.53 mi12:28:482:00:157:4419:00
7:50
+0:08
30K
18.64 mi12:53:592:25:267:4825:11
8:06
+0:16
20M
20.00 mi13:04:592:36:267:4911:00
8:06
0:00
21M
21.00 mi13:13:252:44:527:518:26
8:26
+0:20
35K
21.75 mi13:19:012:50:287:505:36
7:29
-0:57
23M
23.00 mi13:28:583:00:257:519:57
7:57
+0:28
24M
24.00 mi13:36:503:08:177:517:52
7:52
-0:05
40K
24.85 mi13:43:463:15:137:516:56
8:07
+0:15
25.2M
25.20 mi13:46:543:18:217:523:08
9:05
+0:58
Finish
26.22 mi13:54:593:26:267:538:05
7:56
-1:09

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

7:27 /mi

Average Pace

7:53 /mi

Slowest Pace

9:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

28:44

14% of race

Time at Steady Pace

2:03:01

60% of race

Time at Slower Pace

54:41

26% of race

Average Pace: 7:52 /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 mi10:51:4123:087:2723:08
7:27
#11744
10K
6.21 mi11:15:3847:057:3523:57
7:43
#12806
15K
9.32 mi11:40:041:11:317:4024:26
7:52
#13509
20K
12.43 mi12:04:331:36:007:4324:29
7:53
#13576
Half
13.11 mi12:09:481:41:157:435:15
7:42
#13558
25K
15.53 mi12:28:482:00:157:4419:00
7:50
#13361
30K
18.64 mi12:53:592:25:267:4825:11
8:06
#13097
20M
20.00 mi13:04:592:36:267:4911:00
8:06
#12914
21M
21.00 mi13:13:252:44:527:518:26
8:26
#12698
35K
21.75 mi13:19:012:50:287:505:36
7:29
#12521
23M
23.00 mi13:28:583:00:257:519:57
7:57
#12312
24M
24.00 mi13:36:503:08:177:517:52
7:52
#12212
40K
24.85 mi13:43:463:15:137:516:56
8:07
#12134
25.2M
25.20 mi13:46:543:18:217:523:08
9:05
#12129
Finish
26.22 mi13:54:593:26:267:538:05
7:56
#12118
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi117449063906314922(Top 53%)10330(Top 64%)10330(Top 627%)
10K6.21 mi3.10 mi12806-10629534-4719534-47113954(Top 49%)9975(Top 62%)9975(Top 605%)
15K9.32 mi3.11 mi13509-7039777-2439777-24314922(Top 53%)10330(Top 64%)10330(Top 627%)
20K12.43 mi3.11 mi13576-679764+139764+1313912(Top 49%)9826(Top 61%)9826(Top 596%)
Half13.11 mi0.68 mi13558+189754+109754+1013284(Top 47%)9584(Top 60%)9584(Top 582%)
25K15.53 mi2.42 mi13361+1979634+1209634+12012616(Top 44%)9122(Top 57%)9122(Top 554%)
30K18.64 mi3.11 mi13097+2649449+1859449+18512135(Top 43%)8751(Top 54%)8751(Top 531%)
20M20.00 mi1.36 mi12914+1839344+1059344+10511063(Top 39%)8062(Top 50%)8062(Top 489%)
21M21.00 mi1.00 mi12698+2169219+1259219+12510047(Top 35%)7398(Top 46%)7398(Top 449%)
35K21.75 mi0.75 mi12521+1779116+1039116+1038521(Top 30%)6613(Top 41%)6613(Top 401%)
23M23.00 mi1.25 mi12312+2098979+1378979+1379626(Top 34%)7048(Top 44%)7048(Top 428%)
24M24.00 mi1.00 mi12212+1008902+778902+7710323(Top 36%)7343(Top 46%)7343(Top 446%)
40K24.85 mi0.85 mi12134+788834+688834+6810926(Top 38%)7536(Top 47%)7536(Top 457%)
25.2M25.20 mi0.35 mi12129+58812+228812+2212222(Top 43%)8106(Top 50%)8106(Top 492%)
Finish26.22 mi1.02 mi12118+118783+298783+2912401(Top 44%)8234(Top 51%)8234(Top 500%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 53%
×21story building
+97ft-345ft

Overall

14922

Males

10330

M55-59

10330

5K→10K

3.1 - 6.2 mi

Top 49%
×5story building
+79ft-138ft

Overall

13954

Males

9975

M55-59

9975

10K→15K

6.2 - 9.3 mi

Top 53%
×3story building
+67ft-78ft

Overall

14922

Males

10330

M55-59

10330

15K→20K

9.3 - 12.4 mi

Top 49%
×5story building
+106ft-86ft

Overall

13912

Males

9826

M55-59

9826

20K→Half

12.4 - 13.1 mi

Top 47%
×2story building
+19ft-37ft

Overall

13284

Males

9584

M55-59

9584

Half→25K

13.1 - 15.5 mi

Top 44%
×4story building
+66ft-88ft

Overall

12616

Males

9122

M55-59

9122

25K→30K

15.5 - 18.6 mi

Top 43%
×9story building
+181ft-148ft

Overall

12135

Males

8751

M55-59

8751

30K→20M

18.6 - 20.0 mi

Top 39%
×5story building
+64ft-50ft

Overall

11063

Males

8062

M55-59

8062

20M→21M

20.0 - 21.0 mi

Top 35%
×8story building
+106ft-24ft

Overall

10047

Males

7398

M55-59

7398

21M→35K

21.0 - 21.8 mi

Top 30%
×7story building
+17ft-86ft

Overall

8521

Males

6613

M55-59

6613

35K→23M

21.8 - 23.0 mi

Top 34%
×5story building
+23ft-63ft

Overall

9626

Males

7048

M55-59

7048

23M→24M

23.0 - 24.0 mi

Top 36%
×6story building
+12ft-82ft

Overall

10323

Males

7343

M55-59

7343

24M→40K

24.0 - 24.9 mi

Top 38%
×1story
+6ft-20ft

Overall

10926

Males

7536

M55-59

7536

40K→25.2M

24.9 - 25.2 mi

Top 43%
×1story
+13ft-16ft

Overall

12222

Males

8106

M55-59

8106

25.2M→Finish

25.2 - 26.2 mi

Top 44%
×2story building
+22ft-21ft

Overall

12401

Males

8234

M55-59

8234

Passing Analysis

Category:
Athletes Passed
2127
Passed By
2501
Net Change
-374
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11744
5K → 10K351097-1062#11744#12806
10K → 15K54757-703#12806#13509
15K → 20K165232-67#13509#13576
20K → Half3921+18#13576#13558
Half → 25K26164+197#13558#13361
25K → 30K381117+264#13361#13097
30K → 20M21330+183#13097#12914
20M → 21M22812+216#12914#12698
21M → 35K1792+177#12698#12521
35K → 23M22314+209#12521#12312
23M → 24M12525+100#12312#12212
24M → 40K11032+78#12212#12134
40K → 25.2M4237+5#12134#12129
25.2M → Finish7261+11#12129#12118
TOTALS21272501-374
📊

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