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BOSTON MARATHON 2023

Sarah Shirley

Bib: 18117•F

CA

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
26:09
Rank: #17017
Start → 5K
8:25/mi
26:09 split
10K· 6.21 mi
52:06
Rank: #17109 (-92)
5K → 10K
8:21/mi
25:57 split
15K· 9.32 mi
1:17:32
Rank: #16649 (+460)
10K → 15K
8:11/mi
25:26 split
20K· 12.43 mi
1:43:18
Rank: #16381 (+268)
15K → 20K
8:18/mi
25:46 split
Half· 13.11 mi
1:48:53
Rank: #16336 (+45)
20K → Half
8:11/mi
5:35 split
25K· 15.53 mi
2:08:54
Rank: #16013 (+323)
Half → 25K
8:15/mi
20:01 split
30K· 18.64 mi
2:36:17
Rank: #16044 (-31)
25K → 30K
8:49/mi
27:23 split
20M
2:48:40
Rank: #16123 (-79)
30K → 20M
9:07/mi
12:23 split
21M
2:58:36
Rank: #16228 (-105)
20M → 21M
9:56/mi
9:56 split
35K· 21.75 mi
3:05:13
Rank: #16256 (-28)
21M → 35K
8:51/mi
6:37 split
23M
3:16:44
Rank: #16300 (-44)
35K → 23M
9:12/mi
11:31 split
24M
3:25:47
Rank: #16343 (-43)
23M → 24M
9:03/mi
9:03 split
40K· 24.85 mi
3:33:38
Rank: #16359 (-16)
24M → 40K
9:11/mi
7:51 split
25.2M
3:37:05
Rank: #16380 (-21)
40K → 25.2M
10:00/mi
3:27 split
Finish· 26.22 mi
3:46:11
Rank: #16428 (-48)
25.2M → Finish
8:56/mi
9:06 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:48:53
Pace8:18 /mi
2nd Half
Distance13.11 mi
Time1:57:18
Pace8:57 /mi
📊Positive Split: 7.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:2626:098:2526:09
8:25
-
10K
6.21 mi11:43:2352:068:2325:57
8:21
-0:04
15K
9.32 mi12:08:491:17:328:1925:26
8:11
-0:10
20K
12.43 mi12:34:351:43:188:1925:46
8:18
+0:07
Half
13.11 mi12:40:101:48:538:185:35
8:11
-0:07
25K
15.53 mi13:00:112:08:548:1820:01
8:15
+0:04
30K
18.64 mi13:27:342:36:178:2327:23
8:49
+0:34
20M
20.00 mi13:39:572:48:408:2612:23
9:07
+0:18
21M
21.00 mi13:49:532:58:368:309:56
9:56
+0:49
35K
21.75 mi13:56:303:05:138:316:37
8:51
-1:05
23M
23.00 mi14:08:013:16:448:3311:31
9:12
+0:21
24M
24.00 mi14:17:043:25:478:349:03
9:03
-0:09
40K
24.85 mi14:24:553:33:388:367:51
9:11
+0:08
25.2M
25.20 mi14:28:223:37:058:373:27
10:00
+0:49
Finish
26.22 mi14:37:283:46:118:389:06
8:56
-1:04

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

8:11 /mi

Average Pace

8:38 /mi

Slowest Pace

10:00 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:08:54

57% of race

Time at Steady Pace

1:04:32

29% of race

Time at Slower Pace

32:45

14% of race

Average Pace: 8:38 /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 mi11:17:2626:098:2526:09
8:25
#17017
10K
6.21 mi11:43:2352:068:2325:57
8:21
#17109
15K
9.32 mi12:08:491:17:328:1925:26
8:11
#16649
20K
12.43 mi12:34:351:43:188:1925:46
8:18
#16381
Half
13.11 mi12:40:101:48:538:185:35
8:11
#16336
25K
15.53 mi13:00:112:08:548:1820:01
8:15
#16013
30K
18.64 mi13:27:342:36:178:2327:23
8:49
#16044
20M
20.00 mi13:39:572:48:408:2612:23
9:07
#16123
21M
21.00 mi13:49:532:58:368:309:56
9:56
#16228
35K
21.75 mi13:56:303:05:138:316:37
8:51
#16256
23M
23.00 mi14:08:013:16:448:3311:31
9:12
#16300
24M
24.00 mi14:17:043:25:478:349:03
9:03
#16343
40K
24.85 mi14:24:553:33:388:367:51
9:11
#16359
25.2M
25.20 mi14:28:223:37:058:373:27
10:00
#16380
Finish
26.22 mi14:37:283:46:118:389:06
8:56
#16428
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi170175939593915776(Top 59%)5155(Top 45%)5155(Top 106%)
10K6.21 mi3.10 mi17109-925992-535992-5317265(Top 65%)6040(Top 53%)6040(Top 124%)
15K9.32 mi3.11 mi16649+4605695+2975695+29715776(Top 59%)5155(Top 45%)5155(Top 106%)
20K12.43 mi3.11 mi16381+2685543+1525543+15215582(Top 59%)5085(Top 45%)5085(Top 104%)
Half13.11 mi0.68 mi16336+455516+275516+2715773(Top 59%)5179(Top 45%)5179(Top 106%)
25K15.53 mi2.42 mi16013+3235348+1685348+16814664(Top 55%)4632(Top 41%)4632(Top 95%)
30K18.64 mi3.11 mi16044-315402-545402-5416173(Top 61%)5597(Top 49%)5597(Top 115%)
20M20.00 mi1.36 mi16123-795469-675469-6717132(Top 64%)6241(Top 55%)6241(Top 128%)
21M21.00 mi1.00 mi16228-1055555-865555-8617792(Top 67%)6631(Top 58%)6631(Top 136%)
35K21.75 mi0.75 mi16256-285580-255580-2517191(Top 65%)6376(Top 56%)6376(Top 131%)
23M23.00 mi1.25 mi16300-445614-345614-3417059(Top 64%)6321(Top 55%)6321(Top 129%)
24M24.00 mi1.00 mi16343-435652-385652-3817460(Top 66%)6608(Top 58%)6608(Top 135%)
40K24.85 mi0.85 mi16359-165689-375689-3717034(Top 64%)6419(Top 56%)6419(Top 131%)
25.2M25.20 mi0.35 mi16380-215710-215710-2117418(Top 65%)6651(Top 58%)6651(Top 136%)
Finish26.22 mi1.02 mi16428-485739-295739-2917636(Top 66%)6721(Top 59%)6721(Top 138%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 59%
×21story building
+97ft-345ft

Overall

15776

Females

5155

F18-39

5155

5K→10K

3.1 - 6.2 mi

Top 65%
×5story building
+79ft-138ft

Overall

17265

Females

6040

F18-39

6040

10K→15K

6.2 - 9.3 mi

Top 59%
×3story building
+67ft-78ft

Overall

15776

Females

5155

F18-39

5155

15K→20K

9.3 - 12.4 mi

Top 59%
×5story building
+106ft-86ft

Overall

15582

Females

5085

F18-39

5085

20K→Half

12.4 - 13.1 mi

Top 59%
×2story building
+19ft-37ft

Overall

15773

Females

5179

F18-39

5179

Half→25K

13.1 - 15.5 mi

Top 55%
×4story building
+66ft-88ft

Overall

14664

Females

4632

F18-39

4632

25K→30K

15.5 - 18.6 mi

Top 61%
×9story building
+181ft-148ft

Overall

16173

Females

5597

F18-39

5597

30K→20M

18.6 - 20.0 mi

Top 64%
×5story building
+64ft-50ft

Overall

17132

Females

6241

F18-39

6241

20M→21M

20.0 - 21.0 mi

Top 67%
×8story building
+106ft-24ft

Overall

17792

Females

6631

F18-39

6631

21M→35K

21.0 - 21.8 mi

Top 65%
×7story building
+17ft-86ft

Overall

17191

Females

6376

F18-39

6376

35K→23M

21.8 - 23.0 mi

Top 64%
×5story building
+23ft-63ft

Overall

17059

Females

6321

F18-39

6321

23M→24M

23.0 - 24.0 mi

Top 66%
×6story building
+12ft-82ft

Overall

17460

Females

6608

F18-39

6608

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

17034

Females

6419

F18-39

6419

40K→25.2M

24.9 - 25.2 mi

Top 65%
×1story
+13ft-16ft

Overall

17418

Females

6651

F18-39

6651

25.2M→Finish

25.2 - 26.2 mi

Top 66%
×2story building
+22ft-21ft

Overall

17636

Females

6721

F18-39

6721

Passing Analysis

Category:
Athletes Passed
2084
Passed By
1495
Net Change
+589
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17017
5K → 10K266358-92#17017#17109
10K → 15K51959+460#17109#16649
15K → 20K31648+268#16649#16381
20K → Half6116+45#16381#16336
Half → 25K33916+323#16336#16013
25K → 30K169200-31#16013#16044
30K → 20M61140-79#16044#16123
20M → 21M52157-105#16123#16228
21M → 35K4169-28#16228#16256
35K → 23M63107-44#16256#16300
23M → 24M60103-43#16300#16343
24M → 40K7086-16#16343#16359
40K → 25.2M2243-21#16359#16380
25.2M → Finish4593-48#16380#16428
TOTALS20841495+589
📊

Passing Visuals

Category:
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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