Boston Marathon logo
BOSTON MARATHON 2025

Renze Zijlstra

Bib: 13545•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Top 36%
Gender (Male)
#0 / 16105
Top 49%
Masters (Masters Men)
#0 / 10463
Top 38%
Division (M50-54)
#0 / 1996
Top 40%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:02
Rank: #8555
Start → 5K
22:02 | 7:06/mi
10K· 6.21 mi
44:19
Rank: #8884 (-329)
5K → 10K
22:17 | 7:10/mi
15K· 9.32 mi
1:06:28
Rank: #8750 (+134)
10K → 15K
22:09 | 7:08/mi
20K· 12.43 mi
1:28:57
Rank: #8615 (+135)
15K → 20K
22:29 | 7:14/mi
Half· 13.11 mi
1:33:50
Rank: #8609 (+6)
20K → Half
4:53 | 7:09/mi
25K· 15.53 mi
1:51:42
Rank: #8598 (+11)
Half → 25K
17:52 | 7:22/mi
30K· 18.64 mi
2:16:33
Rank: #9063 (-465)
25K → 30K
24:51 | 8:00/mi
20M
2:27:59
Rank: #9370 (-307)
30K → 20M
11:26 | 8:25/mi
21M
2:37:14
Rank: #9703 (-333)
20M → 21M
9:15 | 9:15/mi
35K· 21.75 mi
2:43:11
Rank: #9758 (-55)
21M → 35K
5:57 | 7:57/mi
23M
2:53:39
Rank: #9935 (-177)
35K → 23M
10:28 | 8:22/mi
24M
3:01:54
Rank: #10051 (-116)
23M → 24M
8:15 | 8:15/mi
40K· 24.85 mi
3:08:58
Rank: #10102 (-51)
24M → 40K
7:04 | 8:16/mi
25.2M
3:12:18
Rank: #10179 (-77)
40K → 25.2M
3:20 | 9:40/mi
Finish· 26.22 mi
3:20:32
Rank: #10297 (-118)
25.2M → Finish
8:14 | 8:05/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
Time1:33:50
Pace7:09 /mi
2nd Half
Distance13.11 mi
Time1:46:42
Pace8:08 /mi
📊Positive Split: 13.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:0122:027:0622:02
7:06
-
10K
6.21 mi11:14:1844:197:0822:17
7:10
+0:04
15K
9.32 mi11:36:271:06:287:0822:09
7:08
-0:02
20K
12.43 mi11:58:561:28:577:0922:29
7:14
+0:06
Half
13.11 mi12:03:491:33:507:094:53
7:09
-0:05
25K
15.53 mi12:21:411:51:427:1117:52
7:22
+0:13
30K
18.64 mi12:46:322:16:337:2024:51
8:00
+0:38
20M
20.00 mi12:57:582:27:597:2411:26
8:25
+0:25
21M
21.00 mi13:07:132:37:147:299:15
9:15
+0:50
35K
21.75 mi13:13:102:43:117:305:57
7:57
-1:18
23M
23.00 mi13:23:382:53:397:3310:28
8:22
+0:25
24M
24.00 mi13:31:533:01:547:358:15
8:15
-0:07
40K
24.85 mi13:38:573:08:587:367:04
8:16
+0:01
25.2M
25.20 mi13:42:173:12:187:383:20
9:40
+1:24
Finish
26.22 mi13:50:313:20:327:398:14
8:05
-1:35

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

7:06 /mi

Average Pace

7:39 /mi

Slowest Pace

9:40 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:51:42

56% of race

Time at Steady Pace

1:04:49

32% of race

Time at Slower Pace

24:01

12% of race

Average Pace: 7:39 /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 mi10:52:0122:027:0622:02
7:06
#8555
10K
6.21 mi11:14:1844:197:0822:17
7:10
#8884
15K
9.32 mi11:36:271:06:287:0822:09
7:08
#8750
20K
12.43 mi11:58:561:28:577:0922:29
7:14
#8615
Half
13.11 mi12:03:491:33:507:094:53
7:09
#8609
25K
15.53 mi12:21:411:51:427:1117:52
7:22
#8598
30K
18.64 mi12:46:322:16:337:2024:51
8:00
#9063
20M
20.00 mi12:57:582:27:597:2411:26
8:25
#9370
21M
21.00 mi13:07:132:37:147:299:15
9:15
#9703
35K
21.75 mi13:13:102:43:117:305:57
7:57
#9758
23M
23.00 mi13:23:382:53:397:3310:28
8:22
#9935
24M
24.00 mi13:31:533:01:547:358:15
8:15
#10051
40K
24.85 mi13:38:573:08:587:367:04
8:16
#10102
25.2M
25.20 mi13:42:173:12:187:383:20
9:40
#10179
Finish
26.22 mi13:50:313:20:327:398:14
8:05
#10297
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi8555735673568541(Top 30%)7275(Top 45%)7275(Top 364%)
10K6.21 mi3.10 mi8884-3297525-1697525-1699253(Top 33%)7747(Top 48%)7747(Top 388%)
15K9.32 mi3.11 mi8750+1347436+897436+898541(Top 30%)7275(Top 45%)7275(Top 364%)
20K12.43 mi3.11 mi8615+1357335+1017335+1018505(Top 30%)7167(Top 45%)7167(Top 359%)
Half13.11 mi0.68 mi8609+67318+177318+178736(Top 31%)7348(Top 46%)7348(Top 368%)
25K15.53 mi2.42 mi8598+117300+187300+188895(Top 31%)7284(Top 45%)7284(Top 365%)
30K18.64 mi3.11 mi9063-4657501-2017501-20111350(Top 40%)8361(Top 52%)8361(Top 419%)
20M20.00 mi1.36 mi9370-3077642-1417642-14113210(Top 47%)9076(Top 56%)9076(Top 455%)
21M21.00 mi1.00 mi9703-3337794-1527794-15214865(Top 52%)9720(Top 60%)9720(Top 487%)
35K21.75 mi0.75 mi9758-557798-47798-411887(Top 42%)8257(Top 51%)8257(Top 414%)
23M23.00 mi1.25 mi9935-1777830-327830-3212393(Top 44%)8410(Top 52%)8410(Top 421%)
24M24.00 mi1.00 mi10051-1167854-247854-2412880(Top 45%)8584(Top 53%)8584(Top 430%)
40K24.85 mi0.85 mi10102-517848+67848+611924(Top 42%)8005(Top 50%)8005(Top 401%)
25.2M25.20 mi0.35 mi10179-777872-247872-2415349(Top 54%)9544(Top 59%)9544(Top 478%)
Finish26.22 mi1.02 mi10297-1187899-277899-2713399(Top 47%)8707(Top 54%)8707(Top 436%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21stories
+97ft-345ft

Overall

8541

Males

7275

M50-54

7275

5K→10K

3.1 - 6.2 mi

Top 33%
×5stories
+79ft-138ft

Overall

9253

Males

7747

M50-54

7747

10K→15K

6.2 - 9.3 mi

Top 30%
×3stories
+67ft-78ft

Overall

8541

Males

7275

M50-54

7275

15K→20K

9.3 - 12.4 mi

Top 30%
×5stories
+106ft-86ft

Overall

8505

Males

7167

M50-54

7167

20K→Half

12.4 - 13.1 mi

Top 31%
×2stories
+19ft-37ft

Overall

8736

Males

7348

M50-54

7348

Half→25K

13.1 - 15.5 mi

Top 31%
×4stories
+66ft-88ft

Overall

8895

Males

7284

M50-54

7284

25K→30K

15.5 - 18.6 mi

Top 40%
×9stories
+181ft-148ft

Overall

11350

Males

8361

M50-54

8361

30K→20M

18.6 - 20.0 mi

Top 47%
×5stories
+64ft-50ft

Overall

13210

Males

9076

M50-54

9076

20M→21M

20.0 - 21.0 mi

Top 52%
×8stories
+106ft-24ft

Overall

14865

Males

9720

M50-54

9720

21M→35K

21.0 - 21.8 mi

Top 42%
×7stories
+17ft-86ft

Overall

11887

Males

8257

M50-54

8257

35K→23M

21.8 - 23.0 mi

Top 44%
×5stories
+23ft-63ft

Overall

12393

Males

8410

M50-54

8410

23M→24M

23.0 - 24.0 mi

Top 45%
×6stories
+12ft-82ft

Overall

12880

Males

8584

M50-54

8584

24M→40K

24.0 - 24.9 mi

Top 42%
×1story
+6ft-20ft

Overall

11924

Males

8005

M50-54

8005

40K→25.2M

24.9 - 25.2 mi

Top 54%
×1story
+13ft-16ft

Overall

15349

Males

9544

M50-54

9544

25.2M→Finish

25.2 - 26.2 mi

Top 47%
×2stories
+22ft-21ft

Overall

13399

Males

8707

M50-54

8707

Passing Analysis

Category:
Athletes Passed
1191
Passed By
2929
Net Change
-1742
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8555
5K → 10K86415-329#8555#8884
10K → 15K22793+134#8884#8750
15K → 20K244109+135#8750#8615
20K → Half3933+6#8615#8609
Half → 25K143132+11#8609#8598
25K → 30K103568-465#8598#9063
30K → 20M40347-307#9063#9370
20M → 21M26359-333#9370#9703
21M → 35K47102-55#9703#9758
35K → 23M64240-177#9758#9935
23M → 24M50164-116#9935#10051
24M → 40K68118-51#10051#10102
40K → 25.2M1087-77#10102#10179
25.2M → Finish44162-118#10179#10297
TOTALS11912929-1742
📊

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