Boston Marathon logo
BOSTON MARATHON 2023

Andrew Kortfelt

Bib: 18545•M

CT

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M55-59)
#0 / 1422
Top 47%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:11
Rank: #14741
Start → 5K
25:11 | 8:06/mi
10K· 6.21 mi
50:02
Rank: #14749 (-8)
5K → 10K
24:51 | 8:00/mi
15K· 9.32 mi
1:15:55
Rank: #15451 (-702)
10K → 15K
25:53 | 8:20/mi
20K· 12.43 mi
1:40:57
Rank: #15032 (+419)
15K → 20K
25:02 | 8:03/mi
Half· 13.11 mi
1:46:24
Rank: #14985 (+47)
20K → Half
5:27 | 7:59/mi
25K· 15.53 mi
2:06:05
Rank: #14759 (+226)
Half → 25K
19:41 | 8:07/mi
30K· 18.64 mi
2:31:54
Rank: #14439 (+320)
25K → 30K
25:49 | 8:19/mi
20M
2:43:32
Rank: #14386 (+53)
30K → 20M
11:38 | 8:34/mi
21M
2:52:30
Rank: #14306 (+80)
20M → 21M
8:58 | 8:58/mi
35K· 21.75 mi
2:58:27
Rank: #14209 (+97)
21M → 35K
5:57 | 7:57/mi
23M
3:08:42
Rank: #13994 (+215)
35K → 23M
10:15 | 8:11/mi
24M
3:16:50
Rank: #13886 (+108)
23M → 24M
8:08 | 8:08/mi
40K· 24.85 mi
3:23:59
Rank: #13817 (+69)
24M → 40K
7:09 | 8:22/mi
25.2M
3:26:59
Rank: #13757 (+60)
40K → 25.2M
3:00 | 8:42/mi
Finish· 26.22 mi
3:35:14
Rank: #13696 (+61)
25.2M → Finish
8:15 | 8:06/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
Time1:46:24
Pace8:07 /mi
2nd Half
Distance13.11 mi
Time1:48:50
Pace8:18 /mi
📊Positive Split: 2.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:16:3125:118:0625:11
8:06
-
10K
6.21 mi11:41:2250:028:0324:51
8:00
-0:06
15K
9.32 mi12:07:151:15:558:0925:53
8:20
+0:20
20K
12.43 mi12:32:171:40:578:0725:02
8:03
-0:17
Half
13.11 mi12:37:441:46:248:075:27
7:59
-0:04
25K
15.53 mi12:57:252:06:058:0719:41
8:07
+0:08
30K
18.64 mi13:23:142:31:548:0925:49
8:19
+0:12
20M
20.00 mi13:34:522:43:328:1111:38
8:34
+0:15
21M
21.00 mi13:43:502:52:308:138:58
8:58
+0:24
35K
21.75 mi13:49:472:58:278:125:57
7:57
-1:01
23M
23.00 mi14:00:023:08:428:1210:15
8:11
+0:14
24M
24.00 mi14:08:103:16:508:128:08
8:08
-0:03
40K
24.85 mi14:15:193:23:598:127:09
8:22
+0:14
25.2M
25.20 mi14:18:193:26:598:133:00
8:42
+0:20
Finish
26.22 mi14:26:343:35:148:138:15
8:06
-0:36

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

7:57 /mi

Average Pace

8:13 /mi

Slowest Pace

8:58 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:26:16

96% of race

Time at Steady Pace

8:58

4% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:13 /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 mi11:16:3125:118:0625:11
8:06
#14741
10K
6.21 mi11:41:2250:028:0324:51
8:00
#14749
15K
9.32 mi12:07:151:15:558:0925:53
8:20
#15451
20K
12.43 mi12:32:171:40:578:0725:02
8:03
#15032
Half
13.11 mi12:37:441:46:248:075:27
7:59
#14985
25K
15.53 mi12:57:252:06:058:0719:41
8:07
#14759
30K
18.64 mi13:23:142:31:548:0925:49
8:19
#14439
20M
20.00 mi13:34:522:43:328:1111:38
8:34
#14386
21M
21.00 mi13:43:502:52:308:138:58
8:58
#14306
35K
21.75 mi13:49:472:58:278:125:57
7:57
#14209
23M
23.00 mi14:00:023:08:428:1210:15
8:11
#13994
24M
24.00 mi14:08:103:16:508:128:08
8:08
#13886
40K
24.85 mi14:15:193:23:598:127:09
8:22
#13817
25.2M
25.20 mi14:18:193:26:598:133:00
8:42
#13757
Finish
26.22 mi14:26:343:35:148:138:15
8:06
#13696
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi14741102401024016718(Top 63%)10953(Top 72%)10953(Top 770%)
10K6.21 mi3.10 mi14749-810232+810232+814790(Top 56%)10234(Top 67%)10234(Top 720%)
15K9.32 mi3.11 mi15451-70210485-25310485-25316718(Top 63%)10953(Top 72%)10953(Top 770%)
20K12.43 mi3.11 mi15032+41910310+17510310+17513891(Top 52%)9831(Top 65%)9831(Top 691%)
Half13.11 mi0.68 mi14985+4710289+2110289+2114215(Top 53%)9987(Top 66%)9987(Top 702%)
25K15.53 mi2.42 mi14759+22610180+10910180+10913609(Top 51%)9605(Top 63%)9605(Top 675%)
30K18.64 mi3.11 mi14439+32010001+17910001+17913084(Top 49%)9267(Top 61%)9267(Top 652%)
20M20.00 mi1.36 mi14386+539954+479954+4713979(Top 53%)9561(Top 63%)9561(Top 672%)
21M21.00 mi1.00 mi14306+809903+519903+5113196(Top 50%)9130(Top 60%)9130(Top 642%)
35K21.75 mi0.75 mi14209+979855+489855+4811767(Top 44%)8467(Top 56%)8467(Top 595%)
23M23.00 mi1.25 mi13994+2159749+1069749+10611098(Top 42%)8029(Top 53%)8029(Top 565%)
24M24.00 mi1.00 mi13886+1089680+699680+6912134(Top 46%)8460(Top 56%)8460(Top 595%)
40K24.85 mi0.85 mi13817+699640+409640+4012446(Top 47%)8527(Top 56%)8527(Top 600%)
25.2M25.20 mi0.35 mi13757+609612+289612+2810732(Top 40%)7689(Top 51%)7689(Top 541%)
Finish26.22 mi1.02 mi13696+619569+439569+4312727(Top 48%)8642(Top 57%)8642(Top 608%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21stories
+97ft-345ft

Overall

16718

Males

10953

M55-59

10953

5K→10K

3.1 - 6.2 mi

Top 56%
×5stories
+79ft-138ft

Overall

14790

Males

10234

M55-59

10234

10K→15K

6.2 - 9.3 mi

Top 63%
×3stories
+67ft-78ft

Overall

16718

Males

10953

M55-59

10953

15K→20K

9.3 - 12.4 mi

Top 52%
×5stories
+106ft-86ft

Overall

13891

Males

9831

M55-59

9831

20K→Half

12.4 - 13.1 mi

Top 53%
×2stories
+19ft-37ft

Overall

14215

Males

9987

M55-59

9987

Half→25K

13.1 - 15.5 mi

Top 51%
×4stories
+66ft-88ft

Overall

13609

Males

9605

M55-59

9605

25K→30K

15.5 - 18.6 mi

Top 49%
×9stories
+181ft-148ft

Overall

13084

Males

9267

M55-59

9267

30K→20M

18.6 - 20.0 mi

Top 53%
×5stories
+64ft-50ft

Overall

13979

Males

9561

M55-59

9561

20M→21M

20.0 - 21.0 mi

Top 50%
×8stories
+106ft-24ft

Overall

13196

Males

9130

M55-59

9130

21M→35K

21.0 - 21.8 mi

Top 44%
×7stories
+17ft-86ft

Overall

11767

Males

8467

M55-59

8467

35K→23M

21.8 - 23.0 mi

Top 42%
×5stories
+23ft-63ft

Overall

11098

Males

8029

M55-59

8029

23M→24M

23.0 - 24.0 mi

Top 46%
×6stories
+12ft-82ft

Overall

12134

Males

8460

M55-59

8460

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

12446

Males

8527

M55-59

8527

40K→25.2M

24.9 - 25.2 mi

Top 40%
×1story
+13ft-16ft

Overall

10732

Males

7689

M55-59

7689

25.2M→Finish

25.2 - 26.2 mi

Top 48%
×2stories
+22ft-21ft

Overall

12727

Males

8642

M55-59

8642

Passing Analysis

Category:
Athletes Passed
2398
Passed By
1353
Net Change
+1045
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14741
5K → 10K289297-8#14741#14749
10K → 15K38740-702#14749#15451
15K → 20K45031+419#15451#15032
20K → Half6013+47#15032#14985
Half → 25K25731+226#14985#14759
25K → 30K35737+320#14759#14439
30K → 20M10956+53#14439#14386
20M → 21M11434+80#14386#14306
21M → 35K10710+97#14306#14209
35K → 23M22611+215#14209#13994
23M → 24M12517+108#13994#13886
24M → 40K10132+69#13886#13817
40K → 25.2M655+60#13817#13757
25.2M → Finish10039+61#13757#13696
TOTALS23981353+1045
📊

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