Boston Marathon logo
BOSTON MARATHON 2023

Bryan Lam

Bib: 8579•M

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 24%
Gender (Male)
#0 / 15176
Top 37%
Masters (Masters Men)
#0 / 9891
Top 23%
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
7:08/mi
22:09
↑ 97↓ 3451.5%
10K· 6.21 mi
7:09/mi
44:21
↑ 79↓ 1380.4%
15K· 9.32 mi
7:13/mi
1:06:46
↑ 67↓ 78
20K· 12.43 mi
7:15/mi
1:29:16
↑ 106↓ 860.1%
Half· 13.11 mi
7:08/mi
1:34:08
↑ 19↓ 370.5%
25K· 15.53 mi
7:19/mi
1:51:53
↑ 66↓ 880.2%
30K· 18.64 mi
7:32/mi
2:15:16
↑ 181↓ 1480.2%
20M
7:31/mi
2:25:29
↑ 64↓ 500.2%
21M
7:52/mi
2:33:21
↑ 106↓ 241.6%
35K· 21.75 mi
7:12/mi
2:38:44
↑ 17↓ 861.7%
23M
7:19/mi
2:47:54
↑ 23↓ 630.6%
24M
6:55/mi
2:54:49
↓ 821.3%
40K· 24.85 mi
6:55/mi
3:00:44
↓ 200.3%
25.2M
7:21/mi
3:03:16
↑ 13↓ 160.2%
Finish· 26.22 mi
6:27/mi
3:09:50
↑ 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
Time1:34:08
Pace7:11 /mi
2nd Half
Distance13.11 mi
Time1:35:42
Pace7:18 /mi
📊Positive Split: 1.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:47:2022:097:0822:09
7:08
-
10K
6.21 mi11:09:3244:217:0822:12
7:09
+0:01
15K
9.32 mi11:31:571:06:467:1022:25
7:13
+0:04
20K
12.43 mi11:54:271:29:167:1122:30
7:15
+0:02
Half
13.11 mi11:59:191:34:087:114:52
7:08
-0:07
25K
15.53 mi12:17:041:51:537:1217:45
7:19
+0:11
30K
18.64 mi12:40:272:15:167:1523:23
7:32
+0:13
20M
20.00 mi12:50:402:25:297:1610:13
7:31
-0:01
21M
21.00 mi12:58:322:33:217:187:52
7:52
+0:21
35K
21.75 mi13:03:552:38:447:185:23
7:12
-0:40
23M
23.00 mi13:13:052:47:547:189:10
7:19
+0:07
24M
24.00 mi13:20:002:54:497:176:55
6:55
-0:24
40K
24.85 mi13:25:553:00:447:165:55
6:55
0:00
25.2M
25.20 mi13:28:273:03:167:162:32
7:21
+0:26
Finish
26.22 mi13:35:013:09:507:156:34
6:27
-0:54

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

6:27 /mi

Average Pace

7:15 /mi

Slowest Pace

7:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

19:24

10% of race

Time at Steady Pace

2:08:58

68% of race

Time at Slower Pace

41:28

22% of race

Average Pace: 7:14 /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 mi10:47:2022:097:0822:09
7:08
#7058
10K
6.21 mi11:09:3244:217:0822:12
7:09
#7338
15K
9.32 mi11:31:571:06:467:1022:25
7:13
#7511
20K
12.43 mi11:54:271:29:167:1122:30
7:15
#7422
Half
13.11 mi11:59:191:34:087:114:52
7:08
#7415
25K
15.53 mi12:17:041:51:537:1217:45
7:19
#7382
30K
18.64 mi12:40:272:15:167:1523:23
7:32
#7336
20M
20.00 mi12:50:402:25:297:1610:13
7:31
#7270
21M
21.00 mi12:58:322:33:217:187:52
7:52
#7202
35K
21.75 mi13:03:552:38:447:185:23
7:12
#7161
23M
23.00 mi13:13:052:47:547:189:10
7:19
#6996
24M
24.00 mi13:20:002:54:497:176:55
6:55
#6843
40K
24.85 mi13:25:553:00:447:165:55
6:55
#6671
25.2M
25.20 mi13:28:273:03:167:162:32
7:21
#6585
Finish
26.22 mi13:35:013:09:507:156:34
6:27
#6391
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi7058631263127885(Top 30%)6840(Top 45%)6840(Top 305%)
10K6.21 mi3.10 mi7338-2806512-2006512-2007713(Top 29%)6738(Top 44%)6738(Top 301%)
15K9.32 mi3.11 mi7511-1736628-1166628-1167885(Top 30%)6840(Top 45%)6840(Top 305%)
20K12.43 mi3.11 mi7422+896553+756553+757360(Top 28%)6463(Top 43%)6463(Top 288%)
Half13.11 mi0.68 mi7415+76547+66547+67328(Top 28%)6448(Top 42%)6448(Top 288%)
25K15.53 mi2.42 mi7382+336515+326515+327401(Top 28%)6413(Top 42%)6413(Top 286%)
30K18.64 mi3.11 mi7336+466453+626453+627385(Top 28%)6312(Top 42%)6312(Top 282%)
20M20.00 mi1.36 mi7270+666393+606393+606880(Top 26%)5889(Top 39%)5889(Top 263%)
21M21.00 mi1.00 mi7202+686331+626331+626530(Top 25%)5568(Top 37%)5568(Top 248%)
35K21.75 mi0.75 mi7161+416292+396292+396466(Top 24%)5546(Top 37%)5546(Top 247%)
23M23.00 mi1.25 mi6996+1656143+1496143+1495427(Top 20%)4780(Top 31%)4780(Top 213%)
24M24.00 mi1.00 mi6843+1536024+1196024+1194275(Top 16%)3887(Top 26%)3887(Top 173%)
40K24.85 mi0.85 mi6671+1725888+1365888+1363458(Top 13%)3159(Top 21%)3159(Top 141%)
25.2M25.20 mi0.35 mi6585+865817+715817+713233(Top 12%)2956(Top 19%)2956(Top 132%)
Finish26.22 mi1.02 mi6391+1945680+1375680+1372247(Top 8%)2087(Top 14%)2087(Top 93%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21story building
+97ft-345ft

Overall

7885

Males

6840

M40-44

6840

5K→10K

3.1 - 6.2 mi

Top 29%
×5story building
+79ft-138ft

Overall

7713

Males

6738

M40-44

6738

10K→15K

6.2 - 9.3 mi

Top 30%
×3story building
+67ft-78ft

Overall

7885

Males

6840

M40-44

6840

15K→20K

9.3 - 12.4 mi

Top 28%
×5story building
+106ft-86ft

Overall

7360

Males

6463

M40-44

6463

20K→Half

12.4 - 13.1 mi

Top 28%
×2story building
+19ft-37ft

Overall

7328

Males

6448

M40-44

6448

Half→25K

13.1 - 15.5 mi

Top 28%
×4story building
+66ft-88ft

Overall

7401

Males

6413

M40-44

6413

25K→30K

15.5 - 18.6 mi

Top 28%
×9story building
+181ft-148ft

Overall

7385

Males

6312

M40-44

6312

30K→20M

18.6 - 20.0 mi

Top 26%
×5story building
+64ft-50ft

Overall

6880

Males

5889

M40-44

5889

20M→21M

20.0 - 21.0 mi

Top 25%
×8story building
+106ft-24ft

Overall

6530

Males

5568

M40-44

5568

21M→35K

21.0 - 21.8 mi

Top 24%
×7story building
+17ft-86ft

Overall

6466

Males

5546

M40-44

5546

35K→23M

21.8 - 23.0 mi

Top 20%
×5story building
+23ft-63ft

Overall

5427

Males

4780

M40-44

4780

23M→24M

23.0 - 24.0 mi

Top 16%
×6story building
+12ft-82ft

Overall

4275

Males

3887

M40-44

3887

24M→40K

24.0 - 24.9 mi

Top 13%
×1story
+6ft-20ft

Overall

3458

Males

3159

M40-44

3159

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3233

Males

2956

M40-44

2956

25.2M→Finish

25.2 - 26.2 mi

Top 8%
×2story building
+22ft-21ft

Overall

2247

Males

2087

M40-44

2087

Passing Analysis

Category:
Athletes Passed
1628
Passed By
961
Net Change
+667
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#7058
5K → 10K105385-280#7058#7338
10K → 15K69242-173#7338#7511
15K → 20K15364+89#7511#7422
20K → Half2316+7#7422#7415
Half → 25K9663+33#7415#7382
25K → 30K14397+46#7382#7336
30K → 20M9529+66#7336#7270
20M → 21M9729+68#7270#7202
21M → 35K5716+41#7202#7161
35K → 23M17914+165#7161#6996
23M → 24M1563+153#6996#6843
24M → 40K1720+172#6843#6671
40K → 25.2M871+86#6671#6585
25.2M → Finish1962+194#6585#6391
TOTALS1628961+667
📊

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