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BOSTON MARATHON 2023

Brian Siefferman

Bib: 5930•M

IL

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 17%
Gender (Male)
#0 / 15176
Top 28%
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:44
Rank: #3429
Start → 5K
20:44 | 6:40/mi
10K· 6.21 mi
41:22
Rank: #3592 (-163)
5K → 10K
20:38 | 6:38/mi
15K· 9.32 mi
1:02:11
Rank: #3734 (-142)
10K → 15K
20:49 | 6:42/mi
20K· 12.43 mi
1:23:24
Rank: #3981 (-247)
15K → 20K
21:13 | 6:50/mi
Half· 13.11 mi
1:27:58
Rank: #3982 (-1)
20K → Half
4:34 | 6:42/mi
25K· 15.53 mi
1:44:39
Rank: #4110 (-128)
Half → 25K
16:41 | 6:53/mi
30K· 18.64 mi
2:06:35
Rank: #4230 (-120)
25K → 30K
21:56 | 7:04/mi
20M
2:16:19
Rank: #4285 (-55)
30K → 20M
9:44 | 7:10/mi
21M
2:23:56
Rank: #4351 (-66)
20M → 21M
7:37 | 7:37/mi
35K· 21.75 mi
2:29:06
Rank: #4363 (-12)
21M → 35K
5:10 | 6:54/mi
23M
2:38:11
Rank: #4424 (-61)
35K → 23M
9:05 | 7:15/mi
24M
2:45:12
Rank: #4443 (-19)
23M → 24M
7:01 | 7:01/mi
40K· 24.85 mi
2:51:26
Rank: #4461 (-18)
24M → 40K
6:14 | 7:17/mi
25.2M
2:54:09
Rank: #4471 (-10)
40K → 25.2M
2:43 | 7:53/mi
Finish· 26.22 mi
3:01:26
Rank: #4505 (-34)
25.2M → Finish
7:17 | 7:09/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:27:58
Pace6:43 /mi
2nd Half
Distance13.11 mi
Time1:33:28
Pace7:08 /mi
📊Positive Split: 6.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:23:0620:446:4020:44
6:40
-
10K
6.21 mi10:43:4441:226:3920:38
6:38
-0:02
15K
9.32 mi11:04:331:02:116:4020:49
6:42
+0:04
20K
12.43 mi11:25:461:23:246:4321:13
6:50
+0:08
Half
13.11 mi11:30:201:27:586:434:34
6:42
-0:08
25K
15.53 mi11:47:011:44:396:4416:41
6:53
+0:11
30K
18.64 mi12:08:572:06:356:4721:56
7:04
+0:11
20M
20.00 mi12:18:412:16:196:499:44
7:10
+0:06
21M
21.00 mi12:26:182:23:566:517:37
7:37
+0:27
35K
21.75 mi12:31:282:29:066:515:10
6:54
-0:43
23M
23.00 mi12:40:332:38:116:539:05
7:15
+0:21
24M
24.00 mi12:47:342:45:126:537:01
7:01
-0:14
40K
24.85 mi12:53:482:51:266:546:14
7:17
+0:16
25.2M
25.20 mi12:56:312:54:096:552:43
7:53
+0:36
Finish
26.22 mi13:03:483:01:266:557:17
7:09
-0:44

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

6:38 /mi

Average Pace

6:55 /mi

Slowest Pace

7:53 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:51:06

94% of race

Time at Steady Pace

7:37

4% of race

Time at Slower Pace

2:43

1% of race

Average Pace: 6:55 /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 mi10:23:0620:446:4020:44
6:40
#3429
10K
6.21 mi10:43:4441:226:3920:38
6:38
#3592
15K
9.32 mi11:04:331:02:116:4020:49
6:42
#3734
20K
12.43 mi11:25:461:23:246:4321:13
6:50
#3981
Half
13.11 mi11:30:201:27:586:434:34
6:42
#3982
25K
15.53 mi11:47:011:44:396:4416:41
6:53
#4110
30K
18.64 mi12:08:572:06:356:4721:56
7:04
#4230
20M
20.00 mi12:18:412:16:196:499:44
7:10
#4285
21M
21.00 mi12:26:182:23:566:517:37
7:37
#4351
35K
21.75 mi12:31:282:29:066:515:10
6:54
#4363
23M
23.00 mi12:40:332:38:116:539:05
7:15
#4424
24M
24.00 mi12:47:342:45:126:537:01
7:01
#4443
40K
24.85 mi12:53:482:51:266:546:14
7:17
#4461
25.2M
25.20 mi12:56:312:54:096:552:43
7:53
#4471
Finish
26.22 mi13:03:483:01:266:557:17
7:09
#4505
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi3429323232324140(Top 16%)3886(Top 26%)3886(Top 74%)
10K6.21 mi3.10 mi3592-1633390-1583390-1583815(Top 14%)3599(Top 24%)3599(Top 68%)
15K9.32 mi3.11 mi3734-1423525-1353525-1354140(Top 16%)3886(Top 26%)3886(Top 74%)
20K12.43 mi3.11 mi3981-2473747-2223747-2224707(Top 18%)4379(Top 29%)4379(Top 83%)
Half13.11 mi0.68 mi3982-13745+23745+24296(Top 16%)4020(Top 26%)4020(Top 76%)
25K15.53 mi2.42 mi4110-1283857-1123857-1124810(Top 18%)4456(Top 29%)4456(Top 84%)
30K18.64 mi3.11 mi4230-1203971-1143971-1144714(Top 18%)4351(Top 29%)4351(Top 82%)
20M20.00 mi1.36 mi4285-554014-434014-434907(Top 18%)4462(Top 29%)4462(Top 84%)
21M21.00 mi1.00 mi4351-664065-514065-515158(Top 19%)4583(Top 30%)4583(Top 87%)
35K21.75 mi0.75 mi4363-124074-94074-94789(Top 18%)4325(Top 28%)4325(Top 82%)
23M23.00 mi1.25 mi4424-614130-564130-565047(Top 19%)4496(Top 30%)4496(Top 85%)
24M24.00 mi1.00 mi4443-194146-164146-164740(Top 18%)4231(Top 28%)4231(Top 80%)
40K24.85 mi0.85 mi4461-184161-154161-155349(Top 20%)4579(Top 30%)4579(Top 87%)
25.2M25.20 mi0.35 mi4471-104165-44165-45721(Top 21%)4741(Top 31%)4741(Top 90%)
Finish26.22 mi1.02 mi4505-344188-234188-236063(Top 23%)4970(Top 33%)4970(Top 94%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 16%
×21stories
+97ft-345ft

Overall

4140

Males

3886

M18-39

3886

5K→10K

3.1 - 6.2 mi

Top 14%
×5stories
+79ft-138ft

Overall

3815

Males

3599

M18-39

3599

10K→15K

6.2 - 9.3 mi

Top 16%
×3stories
+67ft-78ft

Overall

4140

Males

3886

M18-39

3886

15K→20K

9.3 - 12.4 mi

Top 18%
×5stories
+106ft-86ft

Overall

4707

Males

4379

M18-39

4379

20K→Half

12.4 - 13.1 mi

Top 16%
×2stories
+19ft-37ft

Overall

4296

Males

4020

M18-39

4020

Half→25K

13.1 - 15.5 mi

Top 18%
×4stories
+66ft-88ft

Overall

4810

Males

4456

M18-39

4456

25K→30K

15.5 - 18.6 mi

Top 18%
×9stories
+181ft-148ft

Overall

4714

Males

4351

M18-39

4351

30K→20M

18.6 - 20.0 mi

Top 18%
×5stories
+64ft-50ft

Overall

4907

Males

4462

M18-39

4462

20M→21M

20.0 - 21.0 mi

Top 19%
×8stories
+106ft-24ft

Overall

5158

Males

4583

M18-39

4583

21M→35K

21.0 - 21.8 mi

Top 18%
×7stories
+17ft-86ft

Overall

4789

Males

4325

M18-39

4325

35K→23M

21.8 - 23.0 mi

Top 19%
×5stories
+23ft-63ft

Overall

5047

Males

4496

M18-39

4496

23M→24M

23.0 - 24.0 mi

Top 18%
×6stories
+12ft-82ft

Overall

4740

Males

4231

M18-39

4231

24M→40K

24.0 - 24.9 mi

Top 20%
×1story
+6ft-20ft

Overall

5349

Males

4579

M18-39

4579

40K→25.2M

24.9 - 25.2 mi

Top 21%
×1story
+13ft-16ft

Overall

5721

Males

4741

M18-39

4741

25.2M→Finish

25.2 - 26.2 mi

Top 23%
×2stories
+22ft-21ft

Overall

6063

Males

4970

M18-39

4970

Passing Analysis

Category:
Athletes Passed
693
Passed By
1769
Net Change
-1076
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3429
5K → 10K131294-163#3429#3592
10K → 15K65207-142#3592#3734
15K → 20K45292-247#3734#3981
20K → Half1617-1#3981#3982
Half → 25K43171-128#3982#4110
25K → 30K81201-120#4110#4230
30K → 20M46101-55#4230#4285
20M → 21M45111-66#4285#4351
21M → 35K3951-12#4351#4363
35K → 23M57118-61#4363#4424
23M → 24M3756-19#4424#4443
24M → 40K3553-18#4443#4461
40K → 25.2M1626-10#4461#4471
25.2M → Finish3771-34#4471#4505
TOTALS6931769-1076
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing