Boston Marathon logo
BOSTON MARATHON 2023

Jack Nelson

Bib: 10805•M

WI

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 42%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 47%
Division (M45-49)
#0 / 2252
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:36/mi
23:36
↑ 97↓ 3451.5%
10K· 6.21 mi
7:20/mi
46:22
↑ 79↓ 1380.4%
15K· 9.32 mi
7:32/mi
1:09:45
↑ 67↓ 78
20K· 12.43 mi
7:37/mi
1:33:24
↑ 106↓ 860.1%
Half· 13.11 mi
7:36/mi
1:38:35
↑ 19↓ 370.5%
25K· 15.53 mi
7:58/mi
1:57:54
↑ 66↓ 880.2%
30K· 18.64 mi
8:15/mi
2:23:31
↑ 181↓ 1480.2%
20M
8:45/mi
2:35:24
↑ 64↓ 500.2%
21M
9:06/mi
2:44:30
↑ 106↓ 241.6%
35K· 21.75 mi
8:13/mi
2:50:39
↑ 17↓ 861.7%
23M
8:20/mi
3:01:05
↑ 23↓ 630.6%
24M
8:20/mi
3:09:25
↓ 821.3%
40K· 24.85 mi
7:55/mi
3:16:11
↓ 200.3%
25.2M
8:10/mi
3:19:00
↑ 13↓ 160.2%
Finish· 26.22 mi
7:40/mi
3:26:49
↑ 22↓ 21

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
Time1:38:35
Pace7:31 /mi
2nd Half
Distance13.11 mi
Time1:48:14
Pace8:15 /mi
📊Positive Split: 9.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:5223:367:3623:36
7:36
-
10K
6.21 mi11:14:3846:227:2822:46
7:20
-0:16
15K
9.32 mi11:38:011:09:457:2923:23
7:32
+0:12
20K
12.43 mi12:01:401:33:247:3123:39
7:37
+0:05
Half
13.11 mi12:06:511:38:357:315:11
7:36
-0:01
25K
15.53 mi12:26:101:57:547:3519:19
7:58
+0:22
30K
18.64 mi12:51:472:23:317:4225:37
8:15
+0:17
20M
20.00 mi13:03:402:35:247:4611:53
8:45
+0:30
21M
21.00 mi13:12:462:44:307:509:06
9:06
+0:21
35K
21.75 mi13:18:552:50:397:516:09
8:13
-0:53
23M
23.00 mi13:29:213:01:057:5210:26
8:20
+0:07
24M
24.00 mi13:37:413:09:257:548:20
8:20
0:00
40K
24.85 mi13:44:273:16:117:546:46
7:55
-0:25
25.2M
25.20 mi13:47:163:19:007:542:49
8:10
+0:15
Finish
26.22 mi13:55:053:26:497:547:49
7:40
-0:30

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

7:20 /mi

Average Pace

7:54 /mi

Slowest Pace

9:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:46:24

51% of race

Time at Steady Pace

28:54

14% of race

Time at Slower Pace

1:11:31

35% of race

Average Pace: 7:53 /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 mi10:51:5223:367:3623:36
7:36
#10493
10K
6.21 mi11:14:3846:227:2822:46
7:20
#9678
15K
9.32 mi11:38:011:09:457:2923:23
7:32
#9885
20K
12.43 mi12:01:401:33:247:3123:39
7:37
#9970
Half
13.11 mi12:06:511:38:357:315:11
7:36
#10014
25K
15.53 mi12:26:101:57:547:3519:19
7:58
#10394
30K
18.64 mi12:51:472:23:317:4225:37
8:15
#10766
20M
20.00 mi13:03:402:35:247:4611:53
8:45
#11095
21M
21.00 mi13:12:462:44:307:509:06
9:06
#11269
35K
21.75 mi13:18:552:50:397:516:09
8:13
#11360
23M
23.00 mi13:29:213:01:057:5210:26
8:20
#11415
24M
24.00 mi13:37:413:09:257:548:20
8:20
#11521
40K
24.85 mi13:44:273:16:117:546:46
7:55
#11415
25.2M
25.20 mi13:47:163:19:007:542:49
8:10
#11332
Finish
26.22 mi13:55:053:26:497:547:49
7:40
#11228
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi104938405840510383(Top 39%)8351(Top 55%)8351(Top 371%)
10K6.21 mi3.10 mi9678+8157974+4317974+4319063(Top 34%)7620(Top 50%)7620(Top 338%)
15K9.32 mi3.11 mi9885-2078096-1228096-12210383(Top 39%)8351(Top 55%)8351(Top 371%)
20K12.43 mi3.11 mi9970-858134-388134-3810171(Top 38%)8169(Top 54%)8169(Top 363%)
Half13.11 mi0.68 mi10014-448162-288162-2810960(Top 41%)8599(Top 57%)8599(Top 382%)
25K15.53 mi2.42 mi10394-3808341-1798341-17912440(Top 47%)9092(Top 60%)9092(Top 404%)
30K18.64 mi3.11 mi10766-3728468-1278468-12712635(Top 47%)9070(Top 60%)9070(Top 403%)
20M20.00 mi1.36 mi11095-3298597-1298597-12915106(Top 57%)10022(Top 66%)10022(Top 445%)
21M21.00 mi1.00 mi11269-1748650-538650-5313957(Top 52%)9470(Top 62%)9470(Top 421%)
35K21.75 mi0.75 mi11360-918683-338683-3313536(Top 51%)9196(Top 61%)9196(Top 408%)
23M23.00 mi1.25 mi11415-558673+108673+1012103(Top 45%)8512(Top 56%)8512(Top 378%)
24M24.00 mi1.00 mi11521-1068702-298702-2913400(Top 50%)9042(Top 60%)9042(Top 402%)
40K24.85 mi0.85 mi11415+1068633+698633+699431(Top 35%)7058(Top 47%)7058(Top 313%)
25.2M25.20 mi0.35 mi11332+838587+468587+467512(Top 28%)5912(Top 39%)5912(Top 263%)
Finish26.22 mi1.02 mi11228+1048507+808507+809775(Top 37%)7167(Top 47%)7167(Top 318%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 39%
×21story building
+97ft-345ft

Overall

10383

Males

8351

M45-49

8351

5K→10K

3.1 - 6.2 mi

Top 34%
×5story building
+79ft-138ft

Overall

9063

Males

7620

M45-49

7620

10K→15K

6.2 - 9.3 mi

Top 39%
×3story building
+67ft-78ft

Overall

10383

Males

8351

M45-49

8351

15K→20K

9.3 - 12.4 mi

Top 38%
×5story building
+106ft-86ft

Overall

10171

Males

8169

M45-49

8169

20K→Half

12.4 - 13.1 mi

Top 41%
×2story building
+19ft-37ft

Overall

10960

Males

8599

M45-49

8599

Half→25K

13.1 - 15.5 mi

Top 47%
×4story building
+66ft-88ft

Overall

12440

Males

9092

M45-49

9092

25K→30K

15.5 - 18.6 mi

Top 47%
×9story building
+181ft-148ft

Overall

12635

Males

9070

M45-49

9070

30K→20M

18.6 - 20.0 mi

Top 57%
×5story building
+64ft-50ft

Overall

15106

Males

10022

M45-49

10022

20M→21M

20.0 - 21.0 mi

Top 52%
×8story building
+106ft-24ft

Overall

13957

Males

9470

M45-49

9470

21M→35K

21.0 - 21.8 mi

Top 51%
×7story building
+17ft-86ft

Overall

13536

Males

9196

M45-49

9196

35K→23M

21.8 - 23.0 mi

Top 45%
×5story building
+23ft-63ft

Overall

12103

Males

8512

M45-49

8512

23M→24M

23.0 - 24.0 mi

Top 50%
×6story building
+12ft-82ft

Overall

13400

Males

9042

M45-49

9042

24M→40K

24.0 - 24.9 mi

Top 35%
×1story
+6ft-20ft

Overall

9431

Males

7058

M45-49

7058

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

7512

Males

5912

M45-49

5912

25.2M→Finish

25.2 - 26.2 mi

Top 37%
×2story building
+22ft-21ft

Overall

9775

Males

7167

M45-49

7167

Passing Analysis

Category:
Athletes Passed
1798*
Passed By
2532
Net Change
-735
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10493
5K → 10K875*60+815#10493#9678
10K → 15K100307-207#9678#9885
15K → 20K141*226-85#9885#9970
20K → Half1457-44#9970#10014
Half → 25K44424-380#10014#10394
25K → 30K81453-372#10394#10766
30K → 20M26*355-329#10766#11095
20M → 21M44218-174#11095#11269
21M → 35K28119-91#11269#11360
35K → 23M70125-55#11360#11415
23M → 24M36142-106#11415#11521
24M → 40K12519+106#11521#11415
40K → 25.2M852+83#11415#11332
25.2M → Finish12925+104#11332#11228
TOTALS1798*2532-735

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing