Boston Marathon logo
BOSTON MARATHON 2023

Jun Zeng

Bib: 29101•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 (M40-44)
#0 / 2241
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
10:08/mi
31:29
↑ 97↓ 3451.5%
10K· 6.21 mi
10:12/mi
1:03:09
↑ 79↓ 1380.4%
15K· 9.32 mi
10:23/mi
1:35:25
↑ 67↓ 78
20K· 12.43 mi
10:58/mi
2:09:28
↑ 106↓ 860.1%
Half· 13.11 mi
10:57/mi
2:16:56
↑ 19↓ 370.5%
25K· 15.53 mi
11:02/mi
2:43:42
↑ 66↓ 880.2%
30K· 18.64 mi
11:41/mi
3:19:59
↑ 181↓ 1480.2%
20M
11:47/mi
3:36:00
↑ 64↓ 500.2%
21M
13:00/mi
3:49:00
↑ 106↓ 241.6%
35K· 21.75 mi
12:06/mi
3:58:03
↑ 17↓ 861.7%
23M
12:17/mi
4:13:26
↑ 23↓ 630.6%
24M
11:13/mi
4:24:39
↓ 821.3%
40K· 24.85 mi
11:14/mi
4:34:15
↓ 200.3%
25.2M
12:11/mi
4:38:27
↑ 13↓ 160.2%
Finish· 26.22 mi
10:24/mi
4:49:03
↑ 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
Time2:16:56
Pace10:27 /mi
2nd Half
Distance13.11 mi
Time2:32:07
Pace11:36 /mi
📊Positive Split: 11.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:49:2831:2910:0831:29
10:08
-
10K
6.21 mi12:21:081:03:0910:1031:40
10:12
+0:04
15K
9.32 mi12:53:241:35:2510:1432:16
10:23
+0:11
20K
12.43 mi13:27:272:09:2810:2534:03
10:58
+0:35
Half
13.11 mi13:34:552:16:5610:277:28
10:57
-0:01
25K
15.53 mi14:01:412:43:4210:3226:46
11:02
+0:05
30K
18.64 mi14:37:583:19:5910:4436:17
11:41
+0:39
20M
20.00 mi14:53:593:36:0010:4816:01
11:47
+0:06
21M
21.00 mi15:06:593:49:0010:5413:00
13:00
+1:13
35K
21.75 mi15:16:023:58:0310:579:03
12:06
-0:54
23M
23.00 mi15:31:254:13:2611:0115:23
12:17
+0:11
24M
24.00 mi15:42:384:24:3911:0211:13
11:13
-1:04
40K
24.85 mi15:52:144:34:1511:029:36
11:14
+0:01
25.2M
25.20 mi15:56:264:38:2711:034:12
12:11
+0:57
Finish
26.22 mi16:07:024:49:0311:0210:36
10:24
-1:47

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

10:08 /mi

Average Pace

11:02 /mi

Slowest Pace

13:00 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:46:01

37% of race

Time at Steady Pace

1:29:06

31% of race

Time at Slower Pace

1:33:56

32% of race

Average Pace: 11:01 /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 mi11:49:2831:2910:0831:29
10:08
#23769
10K
6.21 mi12:21:081:03:0910:1031:40
10:12
#23984
15K
9.32 mi12:53:241:35:2510:1432:16
10:23
#24094
20K
12.43 mi13:27:272:09:2810:2534:03
10:58
#24264
Half
13.11 mi13:34:552:16:5610:277:28
10:57
#24307
25K
15.53 mi14:01:412:43:4210:3226:46
11:02
#24252
30K
18.64 mi14:37:583:19:5910:4436:17
11:41
#24219
20M
20.00 mi14:53:593:36:0010:4816:01
11:47
#24196
21M
21.00 mi15:06:593:49:0010:5413:00
13:00
#24197
35K
21.75 mi15:16:023:58:0310:579:03
12:06
#24225
23M
23.00 mi15:31:254:13:2611:0115:23
12:17
#24263
24M
24.00 mi15:42:384:24:3911:0211:13
11:13
#24232
40K
24.85 mi15:52:144:34:1511:029:36
11:14
#24170
25.2M
25.20 mi15:56:264:38:2711:034:12
12:11
#24153
Finish
26.22 mi16:07:024:49:0311:0210:36
10:24
#24116
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi23769139691396924249(Top 91%)14197(Top 94%)14197(Top 634%)
10K6.21 mi3.10 mi23984-21514078-10914078-10924115(Top 91%)14143(Top 93%)14143(Top 631%)
15K9.32 mi3.11 mi24094-11014127-4914127-4924249(Top 91%)14197(Top 94%)14197(Top 634%)
20K12.43 mi3.11 mi24264-17014202-7514202-7524573(Top 92%)14308(Top 94%)14308(Top 638%)
Half13.11 mi0.68 mi24307-4314218-1614218-1624857(Top 93%)14417(Top 95%)14417(Top 643%)
25K15.53 mi2.42 mi24252+5514182+3614182+3624039(Top 90%)14044(Top 93%)14044(Top 627%)
30K18.64 mi3.11 mi24219+3314141+4114141+4124096(Top 91%)14008(Top 92%)14008(Top 625%)
20M20.00 mi1.36 mi24196+2314121+2014121+2023925(Top 90%)13865(Top 91%)13865(Top 619%)
21M21.00 mi1.00 mi24197-114113+814113+824077(Top 90%)13922(Top 92%)13922(Top 621%)
35K21.75 mi0.75 mi24225-2814122-914122-924765(Top 93%)14203(Top 94%)14203(Top 634%)
23M23.00 mi1.25 mi24263-3814134-1214134-1224343(Top 91%)14010(Top 92%)14010(Top 625%)
24M24.00 mi1.00 mi24232+3114113+2114113+2123430(Top 88%)13549(Top 89%)13549(Top 605%)
40K24.85 mi0.85 mi24170+6214080+3314080+3322781(Top 86%)13218(Top 87%)13218(Top 590%)
25.2M25.20 mi0.35 mi24153+1714068+1214068+1222801(Top 86%)13234(Top 87%)13234(Top 591%)
Finish26.22 mi1.02 mi24116+3714042+2614042+2622804(Top 86%)13233(Top 87%)13233(Top 590%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 91%
×21story building
+97ft-345ft

Overall

24249

Males

14197

M40-44

14197

5K→10K

3.1 - 6.2 mi

Top 91%
×5story building
+79ft-138ft

Overall

24115

Males

14143

M40-44

14143

10K→15K

6.2 - 9.3 mi

Top 91%
×3story building
+67ft-78ft

Overall

24249

Males

14197

M40-44

14197

15K→20K

9.3 - 12.4 mi

Top 92%
×5story building
+106ft-86ft

Overall

24573

Males

14308

M40-44

14308

20K→Half

12.4 - 13.1 mi

Top 93%
×2story building
+19ft-37ft

Overall

24857

Males

14417

M40-44

14417

Half→25K

13.1 - 15.5 mi

Top 90%
×4story building
+66ft-88ft

Overall

24039

Males

14044

M40-44

14044

25K→30K

15.5 - 18.6 mi

Top 91%
×9story building
+181ft-148ft

Overall

24096

Males

14008

M40-44

14008

30K→20M

18.6 - 20.0 mi

Top 90%
×5story building
+64ft-50ft

Overall

23925

Males

13865

M40-44

13865

20M→21M

20.0 - 21.0 mi

Top 90%
×8story building
+106ft-24ft

Overall

24077

Males

13922

M40-44

13922

21M→35K

21.0 - 21.8 mi

Top 93%
×7story building
+17ft-86ft

Overall

24765

Males

14203

M40-44

14203

35K→23M

21.8 - 23.0 mi

Top 91%
×5story building
+23ft-63ft

Overall

24343

Males

14010

M40-44

14010

23M→24M

23.0 - 24.0 mi

Top 88%
×6story building
+12ft-82ft

Overall

23430

Males

13549

M40-44

13549

24M→40K

24.0 - 24.9 mi

Top 86%
×1story
+6ft-20ft

Overall

22781

Males

13218

M40-44

13218

40K→25.2M

24.9 - 25.2 mi

Top 86%
×1story
+13ft-16ft

Overall

22801

Males

13234

M40-44

13234

25.2M→Finish

25.2 - 26.2 mi

Top 86%
×2story building
+22ft-21ft

Overall

22804

Males

13233

M40-44

13233

Passing Analysis

Category:
Athletes Passed
817
Passed By
1164
Net Change
-347
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23769
5K → 10K98313-215#23769#23984
10K → 15K83193-110#23984#24094
15K → 20K60230-170#24094#24264
20K → Half1154-43#24264#24307
Half → 25K11762+55#24307#24252
25K → 30K13198+33#24252#24219
30K → 20M6744+23#24219#24196
20M → 21M4142-1#24196#24197
21M → 35K1139-28#24197#24225
35K → 23M1856-38#24225#24263
23M → 24M4211+31#24263#24232
24M → 40K642+62#24232#24170
40K → 25.2M247+17#24170#24153
25.2M → Finish5013+37#24153#24116
TOTALS8171164-347
📊

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing