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BOSTON MARATHON 2023

David Marchefka

Bib: 6431•M

MA

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 20%
Gender (Male)
#0 / 15176
Top 33%
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
21:45
Rank: #6244
Start → 5K
21:45 | 7:00/mi
10K· 6.21 mi
43:08
Rank: #6136 (+108)
5K → 10K
21:23 | 6:53/mi
15K· 9.32 mi
1:04:34
Rank: #6045 (+91)
10K → 15K
21:26 | 6:54/mi
20K· 12.43 mi
1:26:17
Rank: #5998 (+47)
15K → 20K
21:43 | 6:59/mi
Half· 13.11 mi
1:30:55
Rank: #5955 (+43)
20K → Half
4:38 | 6:47/mi
25K· 15.53 mi
1:48:06
Rank: #5965 (-10)
Half → 25K
17:11 | 7:05/mi
30K· 18.64 mi
2:10:43
Rank: #5887 (+78)
25K → 30K
22:37 | 7:17/mi
20M
2:20:34
Rank: #5819 (+68)
30K → 20M
9:51 | 7:15/mi
21M
2:28:16
Rank: #5764 (+55)
20M → 21M
7:42 | 7:42/mi
35K· 21.75 mi
2:33:35
Rank: #5755 (+9)
21M → 35K
5:19 | 7:06/mi
23M
2:42:40
Rank: #5653 (+102)
35K → 23M
9:05 | 7:15/mi
24M
2:49:47
Rank: #5588 (+65)
23M → 24M
7:07 | 7:07/mi
40K· 24.85 mi
2:55:59
Rank: #5528 (+60)
24M → 40K
6:12 | 7:15/mi
25.2M
2:58:40
Rank: #5500 (+28)
40K → 25.2M
2:41 | 7:47/mi
Finish· 26.22 mi
3:05:55
Rank: #5449 (+51)
25.2M → Finish
7:15 | 7:07/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:30:55
Pace6:56 /mi
2nd Half
Distance13.11 mi
Time1:35:00
Pace7:15 /mi
📊Positive Split: 4.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:25:3721:457:0021:45
7:00
-
10K
6.21 mi10:47:0043:086:5621:23
6:53
-0:07
15K
9.32 mi11:08:261:04:346:5621:26
6:54
+0:01
20K
12.43 mi11:30:091:26:176:5721:43
6:59
+0:05
Half
13.11 mi11:34:471:30:556:564:38
6:47
-0:12
25K
15.53 mi11:51:581:48:066:5817:11
7:05
+0:18
30K
18.64 mi12:14:352:10:437:0122:37
7:17
+0:12
20M
20.00 mi12:24:262:20:347:029:51
7:15
-0:02
21M
21.00 mi12:32:082:28:167:047:42
7:42
+0:27
35K
21.75 mi12:37:272:33:357:045:19
7:06
-0:36
23M
23.00 mi12:46:322:42:407:049:05
7:15
+0:09
24M
24.00 mi12:53:392:49:477:047:07
7:07
-0:08
40K
24.85 mi12:59:512:55:597:056:12
7:15
+0:08
25.2M
25.20 mi13:02:322:58:407:052:41
7:47
+0:32
Finish
26.22 mi13:09:473:05:557:067:15
7:07
-0:40

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

6:47 /mi

Average Pace

7:06 /mi

Slowest Pace

7:47 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:55:32

94% of race

Time at Steady Pace

10:23

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:05 /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 mi10:25:3721:457:0021:45
7:00
#6244
10K
6.21 mi10:47:0043:086:5621:23
6:53
#6136
15K
9.32 mi11:08:261:04:346:5621:26
6:54
#6045
20K
12.43 mi11:30:091:26:176:5721:43
6:59
#5998
Half
13.11 mi11:34:471:30:556:564:38
6:47
#5955
25K
15.53 mi11:51:581:48:066:5817:11
7:05
#5965
30K
18.64 mi12:14:352:10:437:0122:37
7:17
#5887
20M
20.00 mi12:24:262:20:347:029:51
7:15
#5819
21M
21.00 mi12:32:082:28:167:047:42
7:42
#5764
35K
21.75 mi12:37:272:33:357:045:19
7:06
#5755
23M
23.00 mi12:46:322:42:407:049:05
7:15
#5653
24M
24.00 mi12:53:392:49:477:047:07
7:07
#5588
40K
24.85 mi12:59:512:55:597:056:12
7:15
#5528
25.2M
25.20 mi13:02:322:58:407:052:41
7:47
#5500
Finish
26.22 mi13:09:473:05:557:067:15
7:07
#5449
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi6244569556955947(Top 22%)5422(Top 36%)5422(Top 103%)
10K6.21 mi3.10 mi6136+1085591+1045591+1045998(Top 23%)5461(Top 36%)5461(Top 103%)
15K9.32 mi3.11 mi6045+915516+755516+755947(Top 22%)5422(Top 36%)5422(Top 103%)
20K12.43 mi3.11 mi5998+475474+425474+425913(Top 22%)5404(Top 36%)5404(Top 102%)
Half13.11 mi0.68 mi5955+435439+355439+355200(Top 20%)4810(Top 32%)4810(Top 91%)
25K15.53 mi2.42 mi5965-105454-155454-156035(Top 23%)5471(Top 36%)5471(Top 104%)
30K18.64 mi3.11 mi5887+785377+775377+775911(Top 22%)5311(Top 35%)5311(Top 100%)
20M20.00 mi1.36 mi5819+685314+635314+635362(Top 20%)4824(Top 32%)4824(Top 91%)
21M21.00 mi1.00 mi5764+555264+505264+505598(Top 21%)4899(Top 32%)4899(Top 93%)
35K21.75 mi0.75 mi5755+95251+135251+135913(Top 22%)5166(Top 34%)5166(Top 98%)
23M23.00 mi1.25 mi5653+1025157+945157+945066(Top 19%)4515(Top 30%)4515(Top 85%)
24M24.00 mi1.00 mi5588+655092+655092+655277(Top 20%)4622(Top 30%)4622(Top 87%)
40K24.85 mi0.85 mi5528+605037+555037+555145(Top 19%)4441(Top 29%)4441(Top 84%)
25.2M25.20 mi0.35 mi5500+285012+255012+255261(Top 20%)4441(Top 29%)4441(Top 84%)
Finish26.22 mi1.02 mi5449+514963+494963+495883(Top 22%)4849(Top 32%)4849(Top 92%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 22%
×21stories
+97ft-345ft

Overall

5947

Males

5422

M18-39

5422

5K→10K

3.1 - 6.2 mi

Top 23%
×5stories
+79ft-138ft

Overall

5998

Males

5461

M18-39

5461

10K→15K

6.2 - 9.3 mi

Top 22%
×3stories
+67ft-78ft

Overall

5947

Males

5422

M18-39

5422

15K→20K

9.3 - 12.4 mi

Top 22%
×5stories
+106ft-86ft

Overall

5913

Males

5404

M18-39

5404

20K→Half

12.4 - 13.1 mi

Top 20%
×2stories
+19ft-37ft

Overall

5200

Males

4810

M18-39

4810

Half→25K

13.1 - 15.5 mi

Top 23%
×4stories
+66ft-88ft

Overall

6035

Males

5471

M18-39

5471

25K→30K

15.5 - 18.6 mi

Top 22%
×9stories
+181ft-148ft

Overall

5911

Males

5311

M18-39

5311

30K→20M

18.6 - 20.0 mi

Top 20%
×5stories
+64ft-50ft

Overall

5362

Males

4824

M18-39

4824

20M→21M

20.0 - 21.0 mi

Top 21%
×8stories
+106ft-24ft

Overall

5598

Males

4899

M18-39

4899

21M→35K

21.0 - 21.8 mi

Top 22%
×7stories
+17ft-86ft

Overall

5913

Males

5166

M18-39

5166

35K→23M

21.8 - 23.0 mi

Top 19%
×5stories
+23ft-63ft

Overall

5066

Males

4515

M18-39

4515

23M→24M

23.0 - 24.0 mi

Top 20%
×6stories
+12ft-82ft

Overall

5277

Males

4622

M18-39

4622

24M→40K

24.0 - 24.9 mi

Top 19%
×1story
+6ft-20ft

Overall

5145

Males

4441

M18-39

4441

40K→25.2M

24.9 - 25.2 mi

Top 20%
×1story
+13ft-16ft

Overall

5261

Males

4441

M18-39

4441

25.2M→Finish

25.2 - 26.2 mi

Top 22%
×2stories
+22ft-21ft

Overall

5883

Males

4849

M18-39

4849

Passing Analysis

Category:
Athletes Passed
1414
Passed By
619
Net Change
+795
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6244
5K → 10K239131+108#6244#6136
10K → 15K17079+91#6136#6045
15K → 20K12376+47#6045#5998
20K → Half474+43#5998#5955
Half → 25K6979-10#5955#5965
25K → 30K16385+78#5965#5887
30K → 20M9729+68#5887#5819
20M → 21M8025+55#5819#5764
21M → 35K3526+9#5764#5755
35K → 23M12220+102#5755#5653
23M → 24M7914+65#5653#5588
24M → 40K7414+60#5588#5528
40K → 25.2M368+28#5528#5500
25.2M → Finish8029+51#5500#5449
TOTALS1414619+795
📊

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