Boston Marathon logo
BOSTON MARATHON 2023

Stephen Lambert

Bib: 4545•M

ON

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 11%
Gender (Male)
#0 / 15176
Top 19%
Division (M18-39)
#0 / 5285
Top 40%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:13
Rank: #4923
Start → 5K
21:13 | 6:50/mi
10K· 6.21 mi
42:21
Rank: #5078 (-155)
5K → 10K
21:08 | 6:48/mi
15K· 9.32 mi
1:03:46
Rank: #5373 (-295)
10K → 15K
21:25 | 6:54/mi
20K· 12.43 mi
1:24:48
Rank: #5055 (+318)
15K → 20K
21:02 | 6:46/mi
Half· 13.11 mi
1:29:22
Rank: #5004 (+51)
20K → Half
4:34 | 6:42/mi
25K· 15.53 mi
1:45:38
Rank: #4696 (+308)
Half → 25K
16:16 | 6:43/mi
30K· 18.64 mi
2:06:43
Rank: #4294 (+402)
25K → 30K
21:05 | 6:47/mi
20M
2:15:46
Rank: #4038 (+256)
30K → 20M
9:03 | 6:40/mi
21M
2:22:34
Rank: #3763 (+275)
20M → 21M
6:48 | 6:48/mi
35K· 21.75 mi
2:27:28
Rank: #3697 (+66)
21M → 35K
4:54 | 6:33/mi
23M
2:35:46
Rank: #3506 (+191)
35K → 23M
8:18 | 6:38/mi
24M
2:42:09
Rank: #3373 (+133)
23M → 24M
6:23 | 6:23/mi
40K· 24.85 mi
2:47:38
Rank: #3227 (+146)
24M → 40K
5:29 | 6:25/mi
25.2M
2:49:56
Rank: #3148 (+79)
40K → 25.2M
2:18 | 6:40/mi
Finish· 26.22 mi
2:56:10
Rank: #2967 (+181)
25.2M → Finish
6:14 | 6:07/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 Half
Distance13.11 mi
Time1:29:22
Pace6:49 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:26:48
Pace6:37 /mi
📊Negative Split: 2.9% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:23:4021:136:5021:13
6:50
-
10K
6.21 mi10:44:4842:216:4921:08
6:48
-0:02
15K
9.32 mi11:06:131:03:466:5021:25
6:54
+0:06
20K
12.43 mi11:27:151:24:486:4921:02
6:46
-0:08
Half
13.11 mi11:31:491:29:226:494:34
6:42
-0:04
25K
15.53 mi11:48:051:45:386:4816:16
6:43
+0:01
30K
18.64 mi12:09:102:06:436:4821:05
6:47
+0:04
20M
20.00 mi12:18:132:15:466:479:03
6:40
-0:07
21M
21.00 mi12:25:012:22:346:476:48
6:48
+0:08
35K
21.75 mi12:29:552:27:286:474:54
6:33
-0:15
23M
23.00 mi12:38:132:35:466:468:18
6:38
+0:05
24M
24.00 mi12:44:362:42:096:456:23
6:23
-0:15
40K
24.85 mi12:50:052:47:386:455:29
6:25
+0:02
25.2M
25.20 mi12:52:232:49:566:452:18
6:40
+0:15
Finish
26.22 mi12:58:372:56:106:436:14
6:07
-0:33

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

6:07 /mi

Average Pace

6:43 /mi

Slowest Pace

6:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:03:29

36% of race

Time at Steady Pace

1:52:41

64% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:43 /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 mi10:23:4021:136:5021:13
6:50
#4923
10K
6.21 mi10:44:4842:216:4921:08
6:48
#5078
15K
9.32 mi11:06:131:03:466:5021:25
6:54
#5373
20K
12.43 mi11:27:151:24:486:4921:02
6:46
#5055
Half
13.11 mi11:31:491:29:226:494:34
6:42
#5004
25K
15.53 mi11:48:051:45:386:4816:16
6:43
#4696
30K
18.64 mi12:09:102:06:436:4821:05
6:47
#4294
20M
20.00 mi12:18:132:15:466:479:03
6:40
#4038
21M
21.00 mi12:25:012:22:346:476:48
6:48
#3763
35K
21.75 mi12:29:552:27:286:474:54
6:33
#3697
23M
23.00 mi12:38:132:35:466:468:18
6:38
#3506
24M
24.00 mi12:44:362:42:096:456:23
6:23
#3373
40K
24.85 mi12:50:052:47:386:455:29
6:25
#3227
25.2M
25.20 mi12:52:232:49:566:452:18
6:40
#3148
Finish
26.22 mi12:58:372:56:106:436:14
6:07
#2967
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi4923456945695905(Top 22%)5382(Top 35%)5382(Top 102%)
10K6.21 mi3.10 mi5078-1554705-1364705-1365297(Top 20%)4892(Top 32%)4892(Top 93%)
15K9.32 mi3.11 mi5373-2954967-2624967-2625905(Top 22%)5382(Top 35%)5382(Top 102%)
20K12.43 mi3.11 mi5055+3184693+2744693+2744150(Top 16%)3889(Top 26%)3889(Top 74%)
Half13.11 mi0.68 mi5004+514651+424651+424174(Top 16%)3898(Top 26%)3898(Top 74%)
25K15.53 mi2.42 mi4696+3084374+2774374+2773407(Top 13%)3228(Top 21%)3228(Top 61%)
30K18.64 mi3.11 mi4294+4024025+3494025+3492892(Top 11%)2742(Top 18%)2742(Top 52%)
20M20.00 mi1.36 mi4038+2563796+2293796+2292127(Top 8%)2028(Top 13%)2028(Top 38%)
21M21.00 mi1.00 mi3763+2753545+2513545+2511427(Top 5%)1361(Top 9%)1361(Top 26%)
35K21.75 mi0.75 mi3697+663489+563489+562701(Top 10%)2544(Top 17%)2544(Top 48%)
23M23.00 mi1.25 mi3506+1913314+1753314+1751904(Top 7%)1806(Top 12%)1806(Top 34%)
24M24.00 mi1.00 mi3373+1333191+1233191+1231641(Top 6%)1554(Top 10%)1554(Top 29%)
40K24.85 mi0.85 mi3227+1463054+1373054+1371268(Top 5%)1196(Top 8%)1196(Top 23%)
25.2M25.20 mi0.35 mi3148+792982+722982+72865(Top 3%)826(Top 5%)826(Top 16%)
Finish26.22 mi1.02 mi2967+1812809+1732809+1731054(Top 4%)1003(Top 7%)1003(Top 19%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 22%
×21stories
+97ft-345ft

Overall

5905

Males

5382

M18-39

5382

5K→10K

3.1 - 6.2 mi

Top 20%
×5stories
+79ft-138ft

Overall

5297

Males

4892

M18-39

4892

10K→15K

6.2 - 9.3 mi

Top 22%
×3stories
+67ft-78ft

Overall

5905

Males

5382

M18-39

5382

15K→20K

9.3 - 12.4 mi

Top 16%
×5stories
+106ft-86ft

Overall

4150

Males

3889

M18-39

3889

20K→Half

12.4 - 13.1 mi

Top 16%
×2stories
+19ft-37ft

Overall

4174

Males

3898

M18-39

3898

Half→25K

13.1 - 15.5 mi

Top 13%
×4stories
+66ft-88ft

Overall

3407

Males

3228

M18-39

3228

25K→30K

15.5 - 18.6 mi

Top 11%
×9stories
+181ft-148ft

Overall

2892

Males

2742

M18-39

2742

30K→20M

18.6 - 20.0 mi

Top 8%
×5stories
+64ft-50ft

Overall

2127

Males

2028

M18-39

2028

20M→21M

20.0 - 21.0 mi

Top 5%
×8stories
+106ft-24ft

Overall

1427

Males

1361

M18-39

1361

21M→35K

21.0 - 21.8 mi

Top 10%
×7stories
+17ft-86ft

Overall

2701

Males

2544

M18-39

2544

35K→23M

21.8 - 23.0 mi

Top 7%
×5stories
+23ft-63ft

Overall

1904

Males

1806

M18-39

1806

23M→24M

23.0 - 24.0 mi

Top 6%
×6stories
+12ft-82ft

Overall

1641

Males

1554

M18-39

1554

24M→40K

24.0 - 24.9 mi

Top 5%
×1story
+6ft-20ft

Overall

1268

Males

1196

M18-39

1196

40K→25.2M

24.9 - 25.2 mi

Top 3%
×1story
+13ft-16ft

Overall

865

Males

826

M18-39

826

25.2M→Finish

25.2 - 26.2 mi

Top 4%
×2stories
+22ft-21ft

Overall

1054

Males

1003

M18-39

1003

Passing Analysis

Category:
Athletes Passed
2618
Passed By
662
Net Change
+1956
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4923
5K → 10K135290-155#4923#5078
10K → 15K38333-295#5078#5373
15K → 20K32810+318#5373#5055
20K → Half598+51#5055#5004
Half → 25K3113+308#5004#4696
25K → 30K4042+402#4696#4294
30K → 20M2571+256#4294#4038
20M → 21M2750+275#4038#3763
21M → 35K704+66#3763#3697
35K → 23M1932+191#3697#3506
23M → 24M1352+133#3506#3373
24M → 40K1493+146#3373#3227
40K → 25.2M790+79#3227#3148
25.2M → Finish1854+181#3148#2967
TOTALS2618662+1956
📊

Passing Visuals

Category:

📈Position Graph

Loading...

🎨Heatmap Timeline

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