Boston Marathon logo
BOSTON MARATHON 2023

Greg Jackowski

Bib: 13595•M

IL

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 30%
Gender (Male)
#0 / 15176
Top 44%
Masters (Masters Men)
#0 / 9891
Top 31%
Division (M55-59)
#0 / 1422
Top 13%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:59
Rank: #11604
Start → 5K
23:59 | 7:43/mi
10K· 6.21 mi
46:57
Rank: #10514 (+1090)
5K → 10K
22:58 | 7:24/mi
15K· 9.32 mi
1:09:33
Rank: #9695 (+819)
10K → 15K
22:36 | 7:16/mi
20K· 12.43 mi
1:32:23
Rank: #9271 (+424)
15K → 20K
22:50 | 7:21/mi
Half· 13.11 mi
1:37:11
Rank: #9112 (+159)
20K → Half
4:48 | 7:02/mi
25K· 15.53 mi
1:54:47
Rank: #8744 (+368)
Half → 25K
17:36 | 7:16/mi
30K· 18.64 mi
2:17:53
Rank: #8330 (+414)
25K → 30K
23:06 | 7:26/mi
20M
2:28:03
Rank: #8193 (+137)
30K → 20M
10:10 | 7:29/mi
21M
2:35:54
Rank: #8056 (+137)
20M → 21M
7:51 | 7:51/mi
35K· 21.75 mi
2:41:24
Rank: #8024 (+32)
21M → 35K
5:30 | 7:21/mi
23M
2:50:55
Rank: #7928 (+96)
35K → 23M
9:31 | 7:36/mi
24M
2:58:32
Rank: #7938 (-10)
23M → 24M
7:37 | 7:37/mi
40K· 24.85 mi
3:05:14
Rank: #7935 (+3)
24M → 40K
6:42 | 7:50/mi
25.2M
3:08:03
Rank: #7916 (+19)
40K → 25.2M
2:49 | 8:10/mi
Finish· 26.22 mi
3:15:40
Rank: #7919 (-3)
25.2M → Finish
7:37 | 7:28/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
Time1:37:11
Pace7:25 /mi
2nd Half
Distance13.11 mi
Time1:38:29
Pace7:31 /mi
📊Positive Split: 1.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:3123:597:4323:59
7:43
-
10K
6.21 mi11:15:2946:577:3322:58
7:24
-0:19
15K
9.32 mi11:38:051:09:337:2822:36
7:16
-0:08
20K
12.43 mi12:00:551:32:237:2622:50
7:21
+0:05
Half
13.11 mi12:05:431:37:117:254:48
7:02
-0:19
25K
15.53 mi12:23:191:54:477:2317:36
7:16
+0:14
30K
18.64 mi12:46:252:17:537:2423:06
7:26
+0:10
20M
20.00 mi12:56:352:28:037:2410:10
7:29
+0:03
21M
21.00 mi13:04:262:35:547:257:51
7:51
+0:22
35K
21.75 mi13:09:562:41:247:255:30
7:21
-0:30
23M
23.00 mi13:19:272:50:557:269:31
7:36
+0:15
24M
24.00 mi13:27:042:58:327:267:37
7:37
+0:01
40K
24.85 mi13:33:463:05:147:276:42
7:50
+0:13
25.2M
25.20 mi13:36:353:08:037:282:49
8:10
+0:20
Finish
26.22 mi13:44:123:15:407:287:37
7:28
-0:42

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

7:02 /mi

Average Pace

7:28 /mi

Slowest Pace

8:10 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:58:18

91% of race

Time at Steady Pace

17:22

9% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:28 /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 mi10:52:3123:597:4323:59
7:43
#11604
10K
6.21 mi11:15:2946:577:3322:58
7:24
#10514
15K
9.32 mi11:38:051:09:337:2822:36
7:16
#9695
20K
12.43 mi12:00:551:32:237:2622:50
7:21
#9271
Half
13.11 mi12:05:431:37:117:254:48
7:02
#9112
25K
15.53 mi12:23:191:54:477:2317:36
7:16
#8744
30K
18.64 mi12:46:252:17:537:2423:06
7:26
#8330
20M
20.00 mi12:56:352:28:037:2410:10
7:29
#8193
21M
21.00 mi13:04:262:35:547:257:51
7:51
#8056
35K
21.75 mi13:09:562:41:247:255:30
7:21
#8024
23M
23.00 mi13:19:272:50:557:269:31
7:36
#7928
24M
24.00 mi13:27:042:58:327:267:37
7:37
#7938
40K
24.85 mi13:33:463:05:147:276:42
7:50
#7935
25.2M
25.20 mi13:36:353:08:037:282:49
8:10
#7916
Finish
26.22 mi13:44:123:15:407:287:37
7:28
#7919
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi11604893889388338(Top 31%)7131(Top 47%)7131(Top 501%)
10K6.21 mi3.10 mi10514+10908420+5188420+5189531(Top 36%)7881(Top 52%)7881(Top 554%)
15K9.32 mi3.11 mi9695+8197972+4487972+4488338(Top 31%)7131(Top 47%)7131(Top 501%)
20K12.43 mi3.11 mi9271+4247709+2637709+2638136(Top 31%)6975(Top 46%)6975(Top 491%)
Half13.11 mi0.68 mi9112+1597617+927617+926766(Top 25%)6073(Top 40%)6073(Top 427%)
25K15.53 mi2.42 mi8744+3687380+2377380+2377016(Top 26%)6170(Top 41%)6170(Top 434%)
30K18.64 mi3.11 mi8330+4147078+3027078+3026806(Top 26%)5937(Top 39%)5937(Top 418%)
20M20.00 mi1.36 mi8193+1376976+1026976+1026669(Top 25%)5757(Top 38%)5757(Top 405%)
21M21.00 mi1.00 mi8056+1376877+996877+996448(Top 24%)5520(Top 36%)5520(Top 388%)
35K21.75 mi0.75 mi8024+326841+366841+367465(Top 28%)6169(Top 41%)6169(Top 434%)
23M23.00 mi1.25 mi7928+966760+816760+817083(Top 27%)5878(Top 39%)5878(Top 413%)
24M24.00 mi1.00 mi7938-106745+156745+158488(Top 32%)6600(Top 43%)6600(Top 464%)
40K24.85 mi0.85 mi7935+36729+166729+168877(Top 33%)6739(Top 44%)6739(Top 474%)
25.2M25.20 mi0.35 mi7916+196708+216708+217458(Top 28%)5858(Top 39%)5858(Top 412%)
Finish26.22 mi1.02 mi7919-36683+256683+258346(Top 31%)6362(Top 42%)6362(Top 447%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 31%
×21stories
+97ft-345ft

Overall

8338

Males

7131

M55-59

7131

5K→10K

3.1 - 6.2 mi

Top 36%
×5stories
+79ft-138ft

Overall

9531

Males

7881

M55-59

7881

10K→15K

6.2 - 9.3 mi

Top 31%
×3stories
+67ft-78ft

Overall

8338

Males

7131

M55-59

7131

15K→20K

9.3 - 12.4 mi

Top 31%
×5stories
+106ft-86ft

Overall

8136

Males

6975

M55-59

6975

20K→Half

12.4 - 13.1 mi

Top 25%
×2stories
+19ft-37ft

Overall

6766

Males

6073

M55-59

6073

Half→25K

13.1 - 15.5 mi

Top 26%
×4stories
+66ft-88ft

Overall

7016

Males

6170

M55-59

6170

25K→30K

15.5 - 18.6 mi

Top 26%
×9stories
+181ft-148ft

Overall

6806

Males

5937

M55-59

5937

30K→20M

18.6 - 20.0 mi

Top 25%
×5stories
+64ft-50ft

Overall

6669

Males

5757

M55-59

5757

20M→21M

20.0 - 21.0 mi

Top 24%
×8stories
+106ft-24ft

Overall

6448

Males

5520

M55-59

5520

21M→35K

21.0 - 21.8 mi

Top 28%
×7stories
+17ft-86ft

Overall

7465

Males

6169

M55-59

6169

35K→23M

21.8 - 23.0 mi

Top 27%
×5stories
+23ft-63ft

Overall

7083

Males

5878

M55-59

5878

23M→24M

23.0 - 24.0 mi

Top 32%
×6stories
+12ft-82ft

Overall

8488

Males

6600

M55-59

6600

24M→40K

24.0 - 24.9 mi

Top 33%
×1story
+6ft-20ft

Overall

8877

Males

6739

M55-59

6739

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

7458

Males

5858

M55-59

5858

25.2M→Finish

25.2 - 26.2 mi

Top 31%
×2stories
+22ft-21ft

Overall

8346

Males

6362

M55-59

6362

Passing Analysis

Category:
Athletes Passed
4049*
Passed By
364
Net Change
+3685
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11604
5K → 10K1122*32+1090#11604#10514
10K → 15K826*7+819#10514#9695
15K → 20K43713+424#9695#9271
20K → Half1590+159#9271#9112
Half → 25K3691+368#9112#8744
25K → 30K43218+414#8744#8330
30K → 20M14811+137#8330#8193
20M → 21M15114+137#8193#8056
21M → 35K6028+32#8056#8024
35K → 23M12933+96#8024#7928
23M → 24M6171-10#7928#7938
24M → 40K5956+3#7938#7935
40K → 25.2M3415+19#7935#7916
25.2M → Finish6265-3#7916#7919
TOTALS4049*364+3685

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

📊

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