Boston Marathon logo
BOSTON MARATHON 2023

Klaas Tapper

Bib: 6225•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 49%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M40-44)
#0 / 2241
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:57
Rank: #11520
Start → 5K
23:57 | 7:43/mi
10K· 6.21 mi
48:45
Rank: #13149 (-1629)
5K → 10K
24:48 | 7:59/mi
15K· 9.32 mi
1:13:34
Rank: #13515 (-366)
10K → 15K
24:49 | 7:59/mi
20K· 12.43 mi
1:40:14
Rank: #14604 (-1089)
15K → 20K
26:40 | 8:35/mi
Half· 13.11 mi
1:45:27
Rank: #14457 (+147)
20K → Half
5:13 | 7:39/mi
25K· 15.53 mi
2:04:56
Rank: #14219 (+238)
Half → 25K
19:29 | 8:02/mi
30K· 18.64 mi
2:30:34
Rank: #13911 (+308)
25K → 30K
25:38 | 8:15/mi
20M
2:41:57
Rank: #13806 (+105)
30K → 20M
11:23 | 8:23/mi
21M
2:50:42
Rank: #13678 (+128)
20M → 21M
8:45 | 8:45/mi
35K· 21.75 mi
2:56:40
Rank: #13598 (+80)
21M → 35K
5:58 | 7:59/mi
23M
3:06:54
Rank: #13402 (+196)
35K → 23M
10:14 | 8:10/mi
24M
3:14:53
Rank: #13270 (+132)
23M → 24M
7:59 | 7:59/mi
40K· 24.85 mi
3:21:42
Rank: #13109 (+161)
24M → 40K
6:49 | 7:58/mi
25.2M
3:24:41
Rank: #13063 (+46)
40K → 25.2M
2:59 | 8:39/mi
Finish· 26.22 mi
3:32:52
Rank: #13020 (+43)
25.2M → Finish
8:11 | 8:02/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
Time1:45:27
Pace8:03 /mi
2nd Half
Distance13.11 mi
Time1:47:25
Pace8:12 /mi
📊Positive Split: 1.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:27:5023:577:4323:57
7:43
-
10K
6.21 mi10:52:3848:457:5124:48
7:59
+0:16
15K
9.32 mi11:17:271:13:347:5424:49
7:59
0:00
20K
12.43 mi11:44:071:40:148:0426:40
8:35
+0:36
Half
13.11 mi11:49:201:45:278:035:13
7:39
-0:56
25K
15.53 mi12:08:492:04:568:0319:29
8:02
+0:23
30K
18.64 mi12:34:272:30:348:0525:38
8:15
+0:13
20M
20.00 mi12:45:502:41:578:0611:23
8:23
+0:08
21M
21.00 mi12:54:352:50:428:088:45
8:45
+0:22
35K
21.75 mi13:00:332:56:408:075:58
7:59
-0:46
23M
23.00 mi13:10:473:06:548:0810:14
8:10
+0:11
24M
24.00 mi13:18:463:14:538:077:59
7:59
-0:11
40K
24.85 mi13:25:353:21:428:076:49
7:58
-0:01
25.2M
25.20 mi13:28:343:24:418:072:59
8:39
+0:41
Finish
26.22 mi13:36:453:32:528:078:11
8:02
-0:37

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

7:39 /mi

Average Pace

8:07 /mi

Slowest Pace

8:45 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:54:28

82% of race

Time at Steady Pace

38:24

18% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:07 /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 mi10:27:5023:577:4323:57
7:43
#11520
10K
6.21 mi10:52:3848:457:5124:48
7:59
#13149
15K
9.32 mi11:17:271:13:347:5424:49
7:59
#13515
20K
12.43 mi11:44:071:40:148:0426:40
8:35
#14604
Half
13.11 mi11:49:201:45:278:035:13
7:39
#14457
25K
15.53 mi12:08:492:04:568:0319:29
8:02
#14219
30K
18.64 mi12:34:272:30:348:0525:38
8:15
#13911
20M
20.00 mi12:45:502:41:578:0611:23
8:23
#13806
21M
21.00 mi12:54:352:50:428:088:45
8:45
#13678
35K
21.75 mi13:00:332:56:408:075:58
7:59
#13598
23M
23.00 mi13:10:473:06:548:0810:14
8:10
#13402
24M
24.00 mi13:18:463:14:538:077:59
7:59
#13270
40K
24.85 mi13:25:353:21:428:076:49
7:58
#13109
25.2M
25.20 mi13:28:343:24:418:072:59
8:39
#13063
Finish
26.22 mi13:36:453:32:528:078:11
8:02
#13020
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi115208905890514270(Top 54%)10010(Top 66%)10010(Top 447%)
10K6.21 mi3.10 mi13149-16299595-6909595-69014672(Top 55%)10187(Top 67%)10187(Top 455%)
15K9.32 mi3.11 mi13515-3669736-1419736-14114270(Top 54%)10010(Top 66%)10010(Top 447%)
20K12.43 mi3.11 mi14604-108910150-41410150-41417371(Top 65%)11195(Top 74%)11195(Top 500%)
Half13.11 mi0.68 mi14457+14710086+6410086+6411385(Top 43%)8818(Top 58%)8818(Top 393%)
25K15.53 mi2.42 mi14219+2389959+1279959+12713019(Top 49%)9368(Top 62%)9368(Top 418%)
30K18.64 mi3.11 mi13911+3089807+1529807+15212680(Top 48%)9092(Top 60%)9092(Top 406%)
20M20.00 mi1.36 mi13806+1059751+569751+5612854(Top 48%)9060(Top 60%)9060(Top 404%)
21M21.00 mi1.00 mi13678+1289684+679684+6711948(Top 45%)8565(Top 56%)8565(Top 382%)
35K21.75 mi0.75 mi13598+809634+509634+5011919(Top 45%)8530(Top 56%)8530(Top 381%)
23M23.00 mi1.25 mi13402+1969530+1049530+10410987(Top 41%)7968(Top 53%)7968(Top 356%)
24M24.00 mi1.00 mi13270+1329454+769454+7611111(Top 42%)7953(Top 52%)7953(Top 355%)
40K24.85 mi0.85 mi13109+1619355+999355+999868(Top 37%)7284(Top 48%)7284(Top 325%)
25.2M25.20 mi0.35 mi13063+469324+319324+3110442(Top 39%)7540(Top 50%)7540(Top 336%)
Finish26.22 mi1.02 mi13020+439291+339291+3312327(Top 46%)8441(Top 56%)8441(Top 377%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 54%
×21stories
+97ft-345ft

Overall

14270

Males

10010

M40-44

10010

5K→10K

3.1 - 6.2 mi

Top 55%
×5stories
+79ft-138ft

Overall

14672

Males

10187

M40-44

10187

10K→15K

6.2 - 9.3 mi

Top 54%
×3stories
+67ft-78ft

Overall

14270

Males

10010

M40-44

10010

15K→20K

9.3 - 12.4 mi

Top 65%
×5stories
+106ft-86ft

Overall

17371

Males

11195

M40-44

11195

20K→Half

12.4 - 13.1 mi

Top 43%
×2stories
+19ft-37ft

Overall

11385

Males

8818

M40-44

8818

Half→25K

13.1 - 15.5 mi

Top 49%
×4stories
+66ft-88ft

Overall

13019

Males

9368

M40-44

9368

25K→30K

15.5 - 18.6 mi

Top 48%
×9stories
+181ft-148ft

Overall

12680

Males

9092

M40-44

9092

30K→20M

18.6 - 20.0 mi

Top 48%
×5stories
+64ft-50ft

Overall

12854

Males

9060

M40-44

9060

20M→21M

20.0 - 21.0 mi

Top 45%
×8stories
+106ft-24ft

Overall

11948

Males

8565

M40-44

8565

21M→35K

21.0 - 21.8 mi

Top 45%
×7stories
+17ft-86ft

Overall

11919

Males

8530

M40-44

8530

35K→23M

21.8 - 23.0 mi

Top 41%
×5stories
+23ft-63ft

Overall

10987

Males

7968

M40-44

7968

23M→24M

23.0 - 24.0 mi

Top 42%
×6stories
+12ft-82ft

Overall

11111

Males

7953

M40-44

7953

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

9868

Males

7284

M40-44

7284

40K→25.2M

24.9 - 25.2 mi

Top 39%
×1story
+13ft-16ft

Overall

10442

Males

7540

M40-44

7540

25.2M→Finish

25.2 - 26.2 mi

Top 46%
×2stories
+22ft-21ft

Overall

12327

Males

8441

M40-44

8441

Passing Analysis

Category:
Athletes Passed
1990
Passed By
3490
Net Change
-1500
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11520
5K → 10K231652-1629#11520#13149
10K → 15K88454-366#13149#13515
15K → 20K281117-1089#13515#14604
20K → Half1492+147#14604#14457
Half → 25K26729+238#14457#14219
25K → 30K36759+308#14219#13911
30K → 20M14439+105#13911#13806
20M → 21M16638+128#13806#13678
21M → 35K9515+80#13678#13598
35K → 23M20913+196#13598#13402
23M → 24M14715+132#13402#13270
24M → 40K1665+161#13270#13109
40K → 25.2M5711+46#13109#13063
25.2M → Finish8441+43#13063#13020
TOTALS19903490-1500
📊

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