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BOSTON MARATHON 2023

Sylvia Valk

Bib: 18111•F

WI

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 35%
Gender (Female)
#0 / 11423
Top 15%
Division (F18-39)
#0 / 4884
Top 28%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:05
Rank: #11937
Start → 5K
24:05 | 7:45/mi
10K· 6.21 mi
47:28
Rank: #11253 (+684)
5K → 10K
23:23 | 7:32/mi
15K· 9.32 mi
1:10:37
Rank: #10730 (+523)
10K → 15K
23:09 | 7:27/mi
20K· 12.43 mi
1:33:46
Rank: #10238 (+492)
15K → 20K
23:09 | 7:27/mi
Half· 13.11 mi
1:38:49
Rank: #10178 (+60)
20K → Half
5:03 | 7:24/mi
25K· 15.53 mi
1:56:38
Rank: #9723 (+455)
Half → 25K
17:49 | 7:21/mi
30K· 18.64 mi
2:20:15
Rank: #9350 (+373)
25K → 30K
23:37 | 7:36/mi
20M
2:30:56
Rank: #9330 (+20)
30K → 20M
10:41 | 7:52/mi
21M
2:39:04
Rank: #9227 (+103)
20M → 21M
8:08 | 8:08/mi
35K· 21.75 mi
2:44:43
Rank: #9191 (+36)
21M → 35K
5:39 | 7:33/mi
23M
2:56:59
Rank: #9963 (-772)
35K → 23M
12:16 | 9:48/mi
24M
3:04:05
Rank: #9693 (+270)
23M → 24M
7:06 | 7:06/mi
40K· 24.85 mi
3:10:28
Rank: #9535 (+158)
24M → 40K
6:23 | 7:28/mi
25.2M
3:13:09
Rank: #9441 (+94)
40K → 25.2M
2:41 | 7:47/mi
Finish· 26.22 mi
3:20:19
Rank: #9286 (+155)
25.2M → Finish
7:10 | 7:02/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:38:49
Pace7:32 /mi
2nd Half
Distance13.11 mi
Time1:41:30
Pace7:45 /mi
📊Positive Split: 2.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:5724:057:4524:05
7:45
-
10K
6.21 mi11:38:2047:287:3823:23
7:32
-0:13
15K
9.32 mi12:01:291:10:377:3523:09
7:27
-0:05
20K
12.43 mi12:24:381:33:467:3323:09
7:27
0:00
Half
13.11 mi12:29:411:38:497:325:03
7:24
-0:03
25K
15.53 mi12:47:301:56:387:3017:49
7:21
-0:03
30K
18.64 mi13:11:072:20:157:3123:37
7:36
+0:15
20M
20.00 mi13:21:482:30:567:3310:41
7:52
+0:16
21M
21.00 mi13:29:562:39:047:348:08
8:08
+0:16
35K
21.75 mi13:35:352:44:437:345:39
7:33
-0:35
23M
23.00 mi13:47:512:56:597:4212:16
9:48
+2:15
24M
24.00 mi13:54:573:04:057:407:06
7:06
-2:42
40K
24.85 mi14:01:203:10:287:406:23
7:28
+0:22
25.2M
25.20 mi14:04:013:13:097:402:41
7:47
+0:19
Finish
26.22 mi14:11:113:20:197:397:10
7:02
-0:45

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

7:02 /mi

Average Pace

7:39 /mi

Slowest Pace

9:48 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

14:16

7% of race

Time at Steady Pace

2:34:58

77% of race

Time at Slower Pace

31:05

16% of race

Average Pace: 7:38 /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 mi11:14:5724:057:4524:05
7:45
#11937
10K
6.21 mi11:38:2047:287:3823:23
7:32
#11253
15K
9.32 mi12:01:291:10:377:3523:09
7:27
#10730
20K
12.43 mi12:24:381:33:467:3323:09
7:27
#10238
Half
13.11 mi12:29:411:38:497:325:03
7:24
#10178
25K
15.53 mi12:47:301:56:387:3017:49
7:21
#9723
30K
18.64 mi13:11:072:20:157:3123:37
7:36
#9350
20M
20.00 mi13:21:482:30:567:3310:41
7:52
#9330
21M
21.00 mi13:29:562:39:047:348:08
8:08
#9227
35K
21.75 mi13:35:352:44:437:345:39
7:33
#9191
23M
23.00 mi13:47:512:56:597:4212:16
9:48
#9963
24M
24.00 mi13:54:573:04:057:407:06
7:06
#9693
40K
24.85 mi14:01:203:10:287:406:23
7:28
#9535
25.2M
25.20 mi14:04:013:13:097:402:41
7:47
#9441
Finish
26.22 mi14:11:113:20:197:397:10
7:02
#9286
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi11937283028309790(Top 37%)1749(Top 15%)1749(Top 36%)
10K6.21 mi3.10 mi11253+6842468+3622468+36210676(Top 40%)2140(Top 19%)2140(Top 44%)
15K9.32 mi3.11 mi10730+5232188+2802188+2809790(Top 37%)1749(Top 15%)1749(Top 36%)
20K12.43 mi3.11 mi10238+4921942+2461942+2468940(Top 34%)1463(Top 13%)1463(Top 30%)
Half13.11 mi0.68 mi10178+601923+191923+199492(Top 36%)1672(Top 15%)1672(Top 34%)
25K15.53 mi2.42 mi9723+4551733+1901733+1907630(Top 29%)1067(Top 9%)1067(Top 22%)
30K18.64 mi3.11 mi9350+3731629+1041629+1047960(Top 30%)1292(Top 11%)1292(Top 26%)
20M20.00 mi1.36 mi9330+201646-171646-179322(Top 35%)1941(Top 17%)1941(Top 40%)
21M21.00 mi1.00 mi9227+1031626+201626+208228(Top 31%)1624(Top 14%)1624(Top 33%)
35K21.75 mi0.75 mi9191+361625+11625+18957(Top 34%)1894(Top 17%)1894(Top 39%)
23M23.00 mi1.25 mi9963-7721968-3431968-34319425(Top 73%)7639(Top 67%)7639(Top 156%)
24M24.00 mi1.00 mi9693+2701887+811887+815240(Top 20%)649(Top 6%)649(Top 13%)
40K24.85 mi0.85 mi9535+1581841+461841+466556(Top 25%)1192(Top 10%)1192(Top 24%)
25.2M25.20 mi0.35 mi9441+941816+251816+255392(Top 20%)884(Top 8%)884(Top 18%)
Finish26.22 mi1.02 mi9286+1551770+461770+465447(Top 20%)894(Top 8%)894(Top 18%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 37%
×21stories
+97ft-345ft

Overall

9790

Females

1749

F18-39

1749

5K→10K

3.1 - 6.2 mi

Top 40%
×5stories
+79ft-138ft

Overall

10676

Females

2140

F18-39

2140

10K→15K

6.2 - 9.3 mi

Top 37%
×3stories
+67ft-78ft

Overall

9790

Females

1749

F18-39

1749

15K→20K

9.3 - 12.4 mi

Top 34%
×5stories
+106ft-86ft

Overall

8940

Females

1463

F18-39

1463

20K→Half

12.4 - 13.1 mi

Top 36%
×2stories
+19ft-37ft

Overall

9492

Females

1672

F18-39

1672

Half→25K

13.1 - 15.5 mi

Top 29%
×4stories
+66ft-88ft

Overall

7630

Females

1067

F18-39

1067

25K→30K

15.5 - 18.6 mi

Top 30%
×9stories
+181ft-148ft

Overall

7960

Females

1292

F18-39

1292

30K→20M

18.6 - 20.0 mi

Top 35%
×5stories
+64ft-50ft

Overall

9322

Females

1941

F18-39

1941

20M→21M

20.0 - 21.0 mi

Top 31%
×8stories
+106ft-24ft

Overall

8228

Females

1624

F18-39

1624

21M→35K

21.0 - 21.8 mi

Top 34%
×7stories
+17ft-86ft

Overall

8957

Females

1894

F18-39

1894

35K→23M

21.8 - 23.0 mi

Top 73%
×5stories
+23ft-63ft

Overall

19425

Females

7639

F18-39

7639

23M→24M

23.0 - 24.0 mi

Top 20%
×6stories
+12ft-82ft

Overall

5240

Females

649

F18-39

649

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6556

Females

1192

F18-39

1192

40K→25.2M

24.9 - 25.2 mi

Top 20%
×1story
+13ft-16ft

Overall

5392

Females

884

F18-39

884

25.2M→Finish

25.2 - 26.2 mi

Top 20%
×2stories
+22ft-21ft

Overall

5447

Females

894

F18-39

894

Passing Analysis

Category:
Athletes Passed
3732*
Passed By
1081
Net Change
+2651
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11937
5K → 10K77995+684#11937#11253
10K → 15K55229+523#11253#10730
15K → 20K500*8+492#10730#10238
20K → Half7515+60#10238#10178
Half → 25K458*3+455#10178#9723
25K → 30K398*25+373#9723#9350
30K → 20M8464+20#9350#9330
20M → 21M13835+103#9330#9227
21M → 35K5721+36#9227#9191
35K → 23M6778-772#9191#9963
23M → 24M2700+270#9963#9693
24M → 40K161*3+158#9693#9535
40K → 25.2M940+94#9535#9441
25.2M → Finish1605+155#9441#9286
TOTALS3732*1081+2651

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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