Boston Marathon logo
BOSTON MARATHON 2023

Claus Blaabjerg

Bib: 12430•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M50-54)
#0 / 2052
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
26:31
Rank: #17785
Start → 5K
26:31 | 8:32/mi
10K· 6.21 mi
52:39
Rank: #17736 (+49)
5K → 10K
26:08 | 8:25/mi
15K· 9.32 mi
1:19:19
Rank: #17909 (-173)
10K → 15K
26:40 | 8:35/mi
20K· 12.43 mi
1:46:22
Rank: #17955 (-46)
15K → 20K
27:03 | 8:42/mi
Half· 13.11 mi
1:52:19
Rank: #18001 (-46)
20K → Half
5:57 | 8:43/mi
25K· 15.53 mi
2:13:44
Rank: #18011 (-10)
Half → 25K
21:25 | 8:50/mi
30K· 18.64 mi
2:42:13
Rank: #17990 (+21)
25K → 30K
28:29 | 9:10/mi
20M
2:55:17
Rank: #18124 (-134)
30K → 20M
13:04 | 9:37/mi
21M
3:05:32
Rank: #18190 (-66)
20M → 21M
10:15 | 10:15/mi
35K· 21.75 mi
3:12:13
Rank: #18161 (+29)
21M → 35K
6:41 | 8:56/mi
23M
3:23:39
Rank: #18074 (+87)
35K → 23M
11:26 | 9:08/mi
24M
3:32:54
Rank: #18102 (-28)
23M → 24M
9:15 | 9:15/mi
40K· 24.85 mi
3:40:39
Rank: #18035 (+67)
24M → 40K
7:45 | 9:04/mi
25.2M
3:44:34
Rank: #18130 (-95)
40K → 25.2M
3:55 | 11:21/mi
Finish· 26.22 mi
3:54:18
Rank: #18223 (-93)
25.2M → Finish
9:44 | 9:33/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
Time1:52:19
Pace8:34 /mi
2nd Half
Distance13.11 mi
Time2:01:59
Pace9:18 /mi
📊Positive Split: 8.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:3926:318:3226:31
8:32
-
10K
6.21 mi11:45:4752:398:2826:08
8:25
-0:07
15K
9.32 mi12:12:271:19:198:3126:40
8:35
+0:10
20K
12.43 mi12:39:301:46:228:3427:03
8:42
+0:07
Half
13.11 mi12:45:271:52:198:345:57
8:43
+0:01
25K
15.53 mi13:06:522:13:448:3721:25
8:50
+0:07
30K
18.64 mi13:35:212:42:138:4228:29
9:10
+0:20
20M
20.00 mi13:48:252:55:178:4613:04
9:37
+0:27
21M
21.00 mi13:58:403:05:328:5010:15
10:15
+0:38
35K
21.75 mi14:05:213:12:138:506:41
8:56
-1:19
23M
23.00 mi14:16:473:23:398:5111:26
9:08
+0:12
24M
24.00 mi14:26:023:32:548:529:15
9:15
+0:07
40K
24.85 mi14:33:473:40:398:537:45
9:04
-0:11
25.2M
25.20 mi14:37:423:44:348:553:55
11:21
+2:17
Finish
26.22 mi14:47:263:54:188:579:44
9:33
-1:48

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

8:25 /mi

Average Pace

8:57 /mi

Slowest Pace

11:21 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:19:19

34% of race

Time at Steady Pace

1:58:01

50% of race

Time at Slower Pace

36:58

16% of race

Average Pace: 8:56 /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 mi11:19:3926:318:3226:31
8:32
#17785
10K
6.21 mi11:45:4752:398:2826:08
8:25
#17736
15K
9.32 mi12:12:271:19:198:3126:40
8:35
#17909
20K
12.43 mi12:39:301:46:228:3427:03
8:42
#17955
Half
13.11 mi12:45:271:52:198:345:57
8:43
#18001
25K
15.53 mi13:06:522:13:448:3721:25
8:50
#18011
30K
18.64 mi13:35:212:42:138:4228:29
9:10
#17990
20M
20.00 mi13:48:252:55:178:4613:04
9:37
#18124
21M
21.00 mi13:58:403:05:328:5010:15
10:15
#18190
35K
21.75 mi14:05:213:12:138:506:41
8:56
#18161
23M
23.00 mi14:16:473:23:398:5111:26
9:08
#18074
24M
24.00 mi14:26:023:32:548:529:15
9:15
#18102
40K
24.85 mi14:33:473:40:398:537:45
9:04
#18035
25.2M
25.20 mi14:37:423:44:348:553:55
11:21
#18130
Finish
26.22 mi14:47:263:54:188:579:44
9:33
#18223
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi17785113521135218321(Top 69%)11611(Top 77%)11611(Top 566%)
10K6.21 mi3.10 mi17736+4911350+211350+217646(Top 66%)11357(Top 75%)11357(Top 553%)
15K9.32 mi3.11 mi17909-17311421-7111421-7118321(Top 69%)11611(Top 77%)11611(Top 566%)
20K12.43 mi3.11 mi17955-4611439-1811439-1818152(Top 68%)11542(Top 76%)11542(Top 562%)
Half13.11 mi0.68 mi18001-4611467-2811467-2819021(Top 71%)11897(Top 78%)11897(Top 580%)
25K15.53 mi2.42 mi18011-1011448+1911448+1918122(Top 68%)11483(Top 76%)11483(Top 560%)
30K18.64 mi3.11 mi17990+2111412+3611412+3618014(Top 68%)11335(Top 75%)11335(Top 552%)
20M20.00 mi1.36 mi18124-13411449-3711449-3719272(Top 72%)11807(Top 78%)11807(Top 575%)
21M21.00 mi1.00 mi18190-6611453-411453-418867(Top 71%)11582(Top 76%)11582(Top 564%)
35K21.75 mi0.75 mi18161+2911440+1311440+1317605(Top 66%)10976(Top 72%)10976(Top 535%)
23M23.00 mi1.25 mi18074+8711398+4211398+4216687(Top 63%)10539(Top 69%)10539(Top 514%)
24M24.00 mi1.00 mi18102-2811393+511393+518244(Top 69%)11195(Top 74%)11195(Top 546%)
40K24.85 mi0.85 mi18035+6711354+3911354+3916472(Top 62%)10341(Top 68%)10341(Top 504%)
25.2M25.20 mi0.35 mi18130-9511392-3811392-3821209(Top 80%)12475(Top 82%)12475(Top 608%)
Finish26.22 mi1.02 mi18223-9311424-3211424-3220289(Top 76%)12093(Top 80%)12093(Top 589%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 69%
×21stories
+97ft-345ft

Overall

18321

Males

11611

M50-54

11611

5K→10K

3.1 - 6.2 mi

Top 66%
×5stories
+79ft-138ft

Overall

17646

Males

11357

M50-54

11357

10K→15K

6.2 - 9.3 mi

Top 69%
×3stories
+67ft-78ft

Overall

18321

Males

11611

M50-54

11611

15K→20K

9.3 - 12.4 mi

Top 68%
×5stories
+106ft-86ft

Overall

18152

Males

11542

M50-54

11542

20K→Half

12.4 - 13.1 mi

Top 71%
×2stories
+19ft-37ft

Overall

19021

Males

11897

M50-54

11897

Half→25K

13.1 - 15.5 mi

Top 68%
×4stories
+66ft-88ft

Overall

18122

Males

11483

M50-54

11483

25K→30K

15.5 - 18.6 mi

Top 68%
×9stories
+181ft-148ft

Overall

18014

Males

11335

M50-54

11335

30K→20M

18.6 - 20.0 mi

Top 72%
×5stories
+64ft-50ft

Overall

19272

Males

11807

M50-54

11807

20M→21M

20.0 - 21.0 mi

Top 71%
×8stories
+106ft-24ft

Overall

18867

Males

11582

M50-54

11582

21M→35K

21.0 - 21.8 mi

Top 66%
×7stories
+17ft-86ft

Overall

17605

Males

10976

M50-54

10976

35K→23M

21.8 - 23.0 mi

Top 63%
×5stories
+23ft-63ft

Overall

16687

Males

10539

M50-54

10539

23M→24M

23.0 - 24.0 mi

Top 69%
×6stories
+12ft-82ft

Overall

18244

Males

11195

M50-54

11195

24M→40K

24.0 - 24.9 mi

Top 62%
×1story
+6ft-20ft

Overall

16472

Males

10341

M50-54

10341

40K→25.2M

24.9 - 25.2 mi

Top 80%
×1story
+13ft-16ft

Overall

21209

Males

12475

M50-54

12475

25.2M→Finish

25.2 - 26.2 mi

Top 76%
×2stories
+22ft-21ft

Overall

20289

Males

12093

M50-54

12093

Passing Analysis

Category:
Athletes Passed
1430
Passed By
1868
Net Change
-438
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17785
5K → 10K344295+49#17785#17736
10K → 15K126299-173#17736#17909
15K → 20K153199-46#17909#17955
20K → Half1864-46#17955#18001
Half → 25K121131-10#18001#18011
25K → 30K201180+21#18011#17990
30K → 20M53187-134#17990#18124
20M → 21M74140-66#18124#18190
21M → 35K6536+29#18190#18161
35K → 23M11326+87#18161#18074
23M → 24M4977-28#18074#18102
24M → 40K8114+67#18102#18035
40K → 25.2M6101-95#18035#18130
25.2M → Finish26119-93#18130#18223
TOTALS14301868-438
📊

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