Boston Marathon logo
BOSTON MARATHON 2023

Robin Klasek

Bib: 26255•M

MA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
28:12
Rank: #20774
Start → 5K
28:12 | 9:05/mi
10K· 6.21 mi
56:02
Rank: #20711 (+63)
5K → 10K
27:50 | 8:58/mi
15K· 9.32 mi
1:24:21
Rank: #20791 (-80)
10K → 15K
28:19 | 9:07/mi
20K· 12.43 mi
1:54:25
Rank: #21209 (-418)
15K → 20K
30:04 | 9:41/mi
Half· 13.11 mi
2:00:39
Rank: #21188 (+21)
20K → Half
6:14 | 9:08/mi
25K· 15.53 mi
2:24:57
Rank: #21376 (-188)
Half → 25K
24:18 | 10:01/mi
30K· 18.64 mi
2:58:54
Rank: #21736 (-360)
25K → 30K
33:57 | 10:56/mi
20M
3:13:23
Rank: #21784 (-48)
30K → 20M
14:29 | 10:39/mi
21M
3:25:07
Rank: #21840 (-56)
20M → 21M
11:44 | 11:44/mi
35K· 21.75 mi
3:32:36
Rank: #21831 (+9)
21M → 35K
7:29 | 10:00/mi
23M
3:46:47
Rank: #21907 (-76)
35K → 23M
14:11 | 11:20/mi
24M
3:57:13
Rank: #21907
23M → 24M
10:26 | 10:26/mi
40K· 24.85 mi
4:07:16
Rank: #21982 (-75)
24M → 40K
10:03 | 11:45/mi
25.2M
4:11:21
Rank: #21982
40K → 25.2M
4:05 | 11:50/mi
Finish· 26.22 mi
4:21:45
Rank: #21987 (-5)
25.2M → Finish
10:24 | 10:12/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
Time2:00:39
Pace9:12 /mi
2nd Half
Distance13.11 mi
Time2:21:06
Pace10:46 /mi
📊Positive Split: 16.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:45:0528:129:0528:12
9:05
-
10K
6.21 mi12:12:5556:029:0127:50
8:58
-0:07
15K
9.32 mi12:41:141:24:219:0328:19
9:07
+0:09
20K
12.43 mi13:11:181:54:259:1230:04
9:41
+0:34
Half
13.11 mi13:17:322:00:399:126:14
9:08
-0:33
25K
15.53 mi13:41:502:24:579:2024:18
10:01
+0:53
30K
18.64 mi14:15:472:58:549:3633:57
10:56
+0:55
20M
20.00 mi14:30:163:13:239:4014:29
10:39
-0:17
21M
21.00 mi14:42:003:25:079:4611:44
11:44
+1:05
35K
21.75 mi14:49:293:32:369:477:29
10:00
-1:44
23M
23.00 mi15:03:403:46:479:5214:11
11:20
+1:20
24M
24.00 mi15:14:063:57:139:5310:26
10:26
-0:54
40K
24.85 mi15:24:094:07:169:5710:03
11:45
+1:19
25.2M
25.20 mi15:28:144:11:219:584:05
11:50
+0:05
Finish
26.22 mi15:38:384:21:459:5910:24
10:12
-1:38

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

8:58 /mi

Average Pace

9:59 /mi

Slowest Pace

11:50 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:00:39

46% of race

Time at Steady Pace

1:07:06

26% of race

Time at Slower Pace

1:14:00

28% of race

Average Pace: 9:59 /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 mi11:45:0528:129:0528:12
9:05
#20774
10K
6.21 mi12:12:5556:029:0127:50
8:58
#20711
15K
9.32 mi12:41:141:24:219:0328:19
9:07
#20791
20K
12.43 mi13:11:181:54:259:1230:04
9:41
#21209
Half
13.11 mi13:17:322:00:399:126:14
9:08
#21188
25K
15.53 mi13:41:502:24:579:2024:18
10:01
#21376
30K
18.64 mi14:15:472:58:549:3633:57
10:56
#21736
20M
20.00 mi14:30:163:13:239:4014:29
10:39
#21784
21M
21.00 mi14:42:003:25:079:4611:44
11:44
#21840
35K
21.75 mi14:49:293:32:369:477:29
10:00
#21831
23M
23.00 mi15:03:403:46:479:5214:11
11:20
#21907
24M
24.00 mi15:14:063:57:139:5310:26
10:26
#21907
40K
24.85 mi15:24:094:07:169:5710:03
11:45
#21982
25.2M
25.20 mi15:28:144:11:219:584:05
11:50
#21982
Finish
26.22 mi15:38:384:21:459:5910:24
10:12
#21987
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi20774125001250020989(Top 79%)12739(Top 84%)12739(Top 241%)
10K6.21 mi3.10 mi20711+6312538-3812538-3820706(Top 78%)12593(Top 83%)12593(Top 238%)
15K9.32 mi3.11 mi20791-8012600-6212600-6220989(Top 79%)12739(Top 84%)12739(Top 241%)
20K12.43 mi3.11 mi21209-41812803-20312803-20322080(Top 83%)13208(Top 87%)13208(Top 250%)
Half13.11 mi0.68 mi21188+2112801+212801+220947(Top 79%)12715(Top 84%)12715(Top 241%)
25K15.53 mi2.42 mi21376-18812879-7812879-7822257(Top 84%)13258(Top 87%)13258(Top 251%)
30K18.64 mi3.11 mi21736-36013029-15013029-15022974(Top 86%)13499(Top 89%)13499(Top 255%)
20M20.00 mi1.36 mi21784-4813036-713036-722055(Top 83%)13025(Top 86%)13025(Top 246%)
21M21.00 mi1.00 mi21840-5613057-2113057-2122282(Top 84%)13105(Top 86%)13105(Top 248%)
35K21.75 mi0.75 mi21831+913038+1913038+1921271(Top 80%)12614(Top 83%)12614(Top 239%)
23M23.00 mi1.25 mi21907-7613067-2913067-2922945(Top 86%)13363(Top 88%)13363(Top 253%)
24M24.00 mi1.00 mi2190713060+713060+721868(Top 82%)12815(Top 84%)12815(Top 242%)
40K24.85 mi0.85 mi21982-7513083-2313083-2323567(Top 89%)13563(Top 89%)13563(Top 257%)
25.2M25.20 mi0.35 mi2198213079+413079+422205(Top 83%)12946(Top 85%)12946(Top 245%)
Finish26.22 mi1.02 mi21987-513069+1013069+1022299(Top 84%)13000(Top 86%)13000(Top 246%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 79%
×21stories
+97ft-345ft

Overall

20989

Males

12739

M18-39

12739

5K→10K

3.1 - 6.2 mi

Top 78%
×5stories
+79ft-138ft

Overall

20706

Males

12593

M18-39

12593

10K→15K

6.2 - 9.3 mi

Top 79%
×3stories
+67ft-78ft

Overall

20989

Males

12739

M18-39

12739

15K→20K

9.3 - 12.4 mi

Top 83%
×5stories
+106ft-86ft

Overall

22080

Males

13208

M18-39

13208

20K→Half

12.4 - 13.1 mi

Top 79%
×2stories
+19ft-37ft

Overall

20947

Males

12715

M18-39

12715

Half→25K

13.1 - 15.5 mi

Top 84%
×4stories
+66ft-88ft

Overall

22257

Males

13258

M18-39

13258

25K→30K

15.5 - 18.6 mi

Top 86%
×9stories
+181ft-148ft

Overall

22974

Males

13499

M18-39

13499

30K→20M

18.6 - 20.0 mi

Top 83%
×5stories
+64ft-50ft

Overall

22055

Males

13025

M18-39

13025

20M→21M

20.0 - 21.0 mi

Top 84%
×8stories
+106ft-24ft

Overall

22282

Males

13105

M18-39

13105

21M→35K

21.0 - 21.8 mi

Top 80%
×7stories
+17ft-86ft

Overall

21271

Males

12614

M18-39

12614

35K→23M

21.8 - 23.0 mi

Top 86%
×5stories
+23ft-63ft

Overall

22945

Males

13363

M18-39

13363

23M→24M

23.0 - 24.0 mi

Top 82%
×6stories
+12ft-82ft

Overall

21868

Males

12815

M18-39

12815

24M→40K

24.0 - 24.9 mi

Top 89%
×1story
+6ft-20ft

Overall

23567

Males

13563

M18-39

13563

40K→25.2M

24.9 - 25.2 mi

Top 83%
×1story
+13ft-16ft

Overall

22205

Males

12946

M18-39

12946

25.2M→Finish

25.2 - 26.2 mi

Top 84%
×2stories
+22ft-21ft

Overall

22299

Males

13000

M18-39

13000

Passing Analysis

Category:
Athletes Passed
922
Passed By
2135
Net Change
-1213
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20774
5K → 10K336273+63#20774#20711
10K → 15K140220-80#20711#20791
15K → 20K52470-418#20791#21209
20K → Half3413+21#21209#21188
Half → 25K49237-188#21188#21376
25K → 30K53413-360#21376#21736
30K → 20M4795-48#21736#21784
20M → 21M3692-56#21784#21840
21M → 35K3526+9#21840#21831
35K → 23M34110-76#21831#21907
23M → 24M40400#21907#21907
24M → 40K1691-75#21907#21982
40K → 25.2M15150#21982#21982
25.2M → Finish3540-5#21982#21987
TOTALS9222135-1213
📊

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