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BOSTON MARATHON 2023

Lauren Szafran

Bib: 10495•F

FL

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 40%
Gender (Female)
#0 / 11423
Top 21%
Division (F18-39)
#0 / 4884
Top 37%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:54
Rank: #8616
Start → 5K
22:54 | 7:22/mi
10K· 6.21 mi
45:56
Rank: #9137 (-521)
5K → 10K
23:02 | 7:25/mi
15K· 9.32 mi
1:08:58
Rank: #9184 (-47)
10K → 15K
23:02 | 7:25/mi
20K· 12.43 mi
1:32:25
Rank: #9298 (-114)
15K → 20K
23:27 | 7:33/mi
Half· 13.11 mi
1:37:25
Rank: #9262 (+36)
20K → Half
5:00 | 7:20/mi
25K· 15.53 mi
1:57:57
Rank: #10433 (-1171)
Half → 25K
20:32 | 8:28/mi
30K· 18.64 mi
2:22:44
Rank: #10412 (+21)
25K → 30K
24:47 | 7:59/mi
20M
2:33:31
Rank: #10363 (+49)
30K → 20M
10:47 | 7:56/mi
21M
2:42:07
Rank: #10395 (-32)
20M → 21M
8:36 | 8:36/mi
35K· 21.75 mi
2:48:05
Rank: #10416 (-21)
21M → 35K
5:58 | 7:59/mi
23M
2:58:26
Rank: #10458 (-42)
35K → 23M
10:21 | 8:16/mi
24M
3:06:32
Rank: #10522 (-64)
23M → 24M
8:06 | 8:06/mi
40K· 24.85 mi
3:13:41
Rank: #10568 (-46)
24M → 40K
7:09 | 8:22/mi
25.2M
3:16:50
Rank: #10615 (-47)
40K → 25.2M
3:09 | 9:08/mi
Finish· 26.22 mi
3:25:02
Rank: #10662 (-47)
25.2M → Finish
8:12 | 8:03/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:37:25
Pace7:26 /mi
2nd Half
Distance13.11 mi
Time1:47:37
Pace8:13 /mi
📊Positive Split: 10.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:1022:547:2222:54
7:22
-
10K
6.21 mi11:17:1245:567:2423:02
7:25
+0:03
15K
9.32 mi11:40:141:08:587:2423:02
7:25
0:00
20K
12.43 mi12:03:411:32:257:2623:27
7:33
+0:08
Half
13.11 mi12:08:411:37:257:265:00
7:20
-0:13
25K
15.53 mi12:29:131:57:577:3620:32
8:28
+1:08
30K
18.64 mi12:54:002:22:447:3924:47
7:59
-0:29
20M
20.00 mi13:04:472:33:317:4110:47
7:56
-0:03
21M
21.00 mi13:13:232:42:077:438:36
8:36
+0:40
35K
21.75 mi13:19:212:48:057:445:58
7:59
-0:37
23M
23.00 mi13:29:422:58:267:4510:21
8:16
+0:17
24M
24.00 mi13:37:483:06:327:468:06
8:06
-0:10
40K
24.85 mi13:44:573:13:417:487:09
8:22
+0:16
25.2M
25.20 mi13:48:063:16:507:493:09
9:08
+0:46
Finish
26.22 mi13:56:183:25:027:508:12
8:03
-1:05

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

7:20 /mi

Average Pace

7:50 /mi

Slowest Pace

9:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:37:25

48% of race

Time at Steady Pace

57:50

28% of race

Time at Slower Pace

49:47

24% of race

Average Pace: 7:49 /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 mi10:54:1022:547:2222:54
7:22
#8616
10K
6.21 mi11:17:1245:567:2423:02
7:25
#9137
15K
9.32 mi11:40:141:08:587:2423:02
7:25
#9184
20K
12.43 mi12:03:411:32:257:2623:27
7:33
#9298
Half
13.11 mi12:08:411:37:257:265:00
7:20
#9262
25K
15.53 mi12:29:131:57:577:3620:32
8:28
#10433
30K
18.64 mi12:54:002:22:447:3924:47
7:59
#10412
20M
20.00 mi13:04:472:33:317:4110:47
7:56
#10363
21M
21.00 mi13:13:232:42:077:438:36
8:36
#10395
35K
21.75 mi13:19:212:48:057:445:58
7:59
#10416
23M
23.00 mi13:29:422:58:267:4510:21
8:16
#10458
24M
24.00 mi13:37:483:06:327:468:06
8:06
#10522
40K
24.85 mi13:44:573:13:417:487:09
8:22
#10568
25.2M
25.20 mi13:48:063:16:507:493:09
9:08
#10615
Finish
26.22 mi13:56:183:25:027:508:12
8:03
#10662
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi8616124612469472(Top 36%)1614(Top 14%)1614(Top 33%)
10K6.21 mi3.10 mi9137-5211468-2221468-2229770(Top 37%)1721(Top 15%)1721(Top 35%)
15K9.32 mi3.11 mi9184-471495-271495-279472(Top 36%)1614(Top 14%)1614(Top 33%)
20K12.43 mi3.11 mi9298-1141558-631558-639709(Top 36%)1790(Top 16%)1790(Top 37%)
Half13.11 mi0.68 mi9262+361546+121546+128914(Top 33%)1464(Top 13%)1464(Top 30%)
25K15.53 mi2.42 mi10433-11712063-5172063-51716007(Top 60%)5441(Top 48%)5441(Top 111%)
30K18.64 mi3.11 mi10412+212108-452108-4510714(Top 40%)2499(Top 22%)2499(Top 51%)
20M20.00 mi1.36 mi10363+492101+72101+79819(Top 37%)2161(Top 19%)2161(Top 44%)
21M21.00 mi1.00 mi10395-322149-482149-4811066(Top 42%)2901(Top 25%)2901(Top 59%)
35K21.75 mi0.75 mi10416-212180-312180-3111944(Top 45%)3380(Top 30%)3380(Top 69%)
23M23.00 mi1.25 mi10458-422229-492229-4911649(Top 44%)3323(Top 29%)3323(Top 68%)
24M24.00 mi1.00 mi10522-642294-652294-6511953(Top 45%)3554(Top 31%)3554(Top 73%)
40K24.85 mi0.85 mi10568-462348-542348-5412472(Top 47%)3913(Top 34%)3913(Top 80%)
25.2M25.20 mi0.35 mi10615-472378-302378-3013281(Top 50%)4352(Top 38%)4352(Top 89%)
Finish26.22 mi1.02 mi10662-472417-392417-3912449(Top 47%)3926(Top 34%)3926(Top 80%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 36%
×21stories
+97ft-345ft

Overall

9472

Females

1614

F18-39

1614

5K→10K

3.1 - 6.2 mi

Top 37%
×5stories
+79ft-138ft

Overall

9770

Females

1721

F18-39

1721

10K→15K

6.2 - 9.3 mi

Top 36%
×3stories
+67ft-78ft

Overall

9472

Females

1614

F18-39

1614

15K→20K

9.3 - 12.4 mi

Top 36%
×5stories
+106ft-86ft

Overall

9709

Females

1790

F18-39

1790

20K→Half

12.4 - 13.1 mi

Top 33%
×2stories
+19ft-37ft

Overall

8914

Females

1464

F18-39

1464

Half→25K

13.1 - 15.5 mi

Top 60%
×4stories
+66ft-88ft

Overall

16007

Females

5441

F18-39

5441

25K→30K

15.5 - 18.6 mi

Top 40%
×9stories
+181ft-148ft

Overall

10714

Females

2499

F18-39

2499

30K→20M

18.6 - 20.0 mi

Top 37%
×5stories
+64ft-50ft

Overall

9819

Females

2161

F18-39

2161

20M→21M

20.0 - 21.0 mi

Top 42%
×8stories
+106ft-24ft

Overall

11066

Females

2901

F18-39

2901

21M→35K

21.0 - 21.8 mi

Top 45%
×7stories
+17ft-86ft

Overall

11944

Females

3380

F18-39

3380

35K→23M

21.8 - 23.0 mi

Top 44%
×5stories
+23ft-63ft

Overall

11649

Females

3323

F18-39

3323

23M→24M

23.0 - 24.0 mi

Top 45%
×6stories
+12ft-82ft

Overall

11953

Females

3554

F18-39

3554

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

12472

Females

3913

F18-39

3913

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

13281

Females

4352

F18-39

4352

25.2M→Finish

25.2 - 26.2 mi

Top 47%
×2stories
+22ft-21ft

Overall

12449

Females

3926

F18-39

3926

Passing Analysis

Category:
Athletes Passed
1025*
Passed By
3069
Net Change
-2046
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8616
5K → 10K94615-521#8616#9137
10K → 15K131178-47#9137#9184
15K → 20K101215-114#9184#9298
20K → Half4913+36#9298#9262
Half → 25K101179-1171#9262#10433
25K → 30K177156+21#10433#10412
30K → 20M93*44+49#10412#10363
20M → 21M86118-32#10363#10395
21M → 35K3859-21#10395#10416
35K → 23M72114-42#10416#10458
23M → 24M50114-64#10458#10522
24M → 40K5096-46#10522#10568
40K → 25.2M2067-47#10568#10615
25.2M → Finish54101-47#10615#10662
TOTALS1025*3069-2046

* 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