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BOSTON MARATHON 2023

Amber Lopez

Bib: 12338•F

CA

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 49%
Gender (Female)
#0 / 11423
Top 32%
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:25/mi
26:08
↑ 97↓ 3451.5%
10K· 6.21 mi
8:22/mi
52:08
↑ 79↓ 1380.4%
15K· 9.32 mi
8:17/mi
1:17:51
↑ 67↓ 78
20K· 12.43 mi
8:15/mi
1:43:30
↑ 106↓ 860.1%
Half· 13.11 mi
8:15/mi
1:49:08
↑ 19↓ 370.5%
25K· 15.53 mi
8:15/mi
2:09:09
↑ 66↓ 880.2%
30K· 18.64 mi
8:19/mi
2:34:59
↑ 181↓ 1480.2%
20M
8:14/mi
2:46:10
↑ 64↓ 500.2%
21M
8:04/mi
2:54:14
↑ 106↓ 241.6%
35K· 21.75 mi
7:46/mi
3:00:03
↑ 17↓ 861.7%
23M
7:35/mi
3:09:33
↑ 23↓ 630.6%
24M
7:20/mi
3:16:53
↓ 821.3%
40K· 24.85 mi
7:06/mi
3:22:57
↓ 200.3%
25.2M
7:38/mi
3:25:35
↑ 13↓ 160.2%
Finish· 26.22 mi
6:49/mi
3:32:32
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:49:08
Pace8:19 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:43:24
Pace7:53 /mi
📊Negative Split: 5.3% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:2026:088:2526:08
8:25
-
10K
6.21 mi11:20:2052:088:2326:00
8:22
-0:03
15K
9.32 mi11:46:031:17:518:2125:43
8:17
-0:05
20K
12.43 mi12:11:421:43:308:2025:39
8:15
-0:02
Half
13.11 mi12:17:201:49:088:195:38
8:15
0:00
25K
15.53 mi12:37:212:09:098:1920:01
8:15
0:00
30K
18.64 mi13:03:112:34:598:1925:50
8:19
+0:04
20M
20.00 mi13:14:222:46:108:1811:11
8:14
-0:05
21M
21.00 mi13:22:262:54:148:188:04
8:04
-0:10
35K
21.75 mi13:28:153:00:038:175:49
7:46
-0:18
23M
23.00 mi13:37:453:09:338:149:30
7:35
-0:11
24M
24.00 mi13:45:053:16:538:127:20
7:20
-0:15
40K
24.85 mi13:51:093:22:578:106:04
7:06
-0:14
25.2M
25.20 mi13:53:473:25:358:092:38
7:38
+0:32
Finish
26.22 mi14:00:443:32:328:076:57
6:49
-0:49

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

6:49 /mi

Average Pace

8:07 /mi

Slowest Pace

8:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

38:18

18% of race

Time at Steady Pace

2:54:14

82% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:06 /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 mi10:54:2026:088:2526:08
8:25
#16964
10K
6.21 mi11:20:2052:088:2326:00
8:22
#17145
15K
9.32 mi11:46:031:17:518:2125:43
8:17
#16865
20K
12.43 mi12:11:421:43:308:2025:39
8:15
#16483
Half
13.11 mi12:17:201:49:088:195:38
8:15
#16463
25K
15.53 mi12:37:212:09:098:1920:01
8:15
#16133
30K
18.64 mi13:03:112:34:598:1925:50
8:19
#15576
20M
20.00 mi13:14:222:46:108:1811:11
8:14
#15295
21M
21.00 mi13:22:262:54:148:188:04
8:04
#14872
35K
21.75 mi13:28:153:00:038:175:49
7:46
#14705
23M
23.00 mi13:37:453:09:338:149:30
7:35
#14264
24M
24.00 mi13:45:053:16:538:127:20
7:20
#13909
40K
24.85 mi13:51:093:22:578:106:04
7:06
#13502
25.2M
25.20 mi13:53:473:25:358:092:38
7:38
#13314
Finish
26.22 mi14:00:443:32:328:076:57
6:49
#12944
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi169645903590316391(Top 62%)5523(Top 48%)5523(Top 113%)
10K6.21 mi3.10 mi17145-1816017-1146017-11417363(Top 65%)6096(Top 53%)6096(Top 125%)
15K9.32 mi3.11 mi16865+2805832+1855832+18516391(Top 62%)5523(Top 48%)5523(Top 113%)
20K12.43 mi3.11 mi16483+3825598+2345598+23415312(Top 58%)4903(Top 43%)4903(Top 100%)
Half13.11 mi0.68 mi16463+205591+75591+716197(Top 61%)5398(Top 47%)5398(Top 111%)
25K15.53 mi2.42 mi16133+3305415+1765415+17614638(Top 55%)4606(Top 40%)4606(Top 94%)
30K18.64 mi3.11 mi15576+5575111+3045111+30413115(Top 49%)3819(Top 33%)3819(Top 78%)
20M20.00 mi1.36 mi15295+2814963+1484963+14811915(Top 45%)3231(Top 28%)3231(Top 66%)
21M21.00 mi1.00 mi14872+4234715+2484715+2487845(Top 29%)1460(Top 13%)1460(Top 30%)
35K21.75 mi0.75 mi14705+1674625+904625+9010553(Top 40%)2653(Top 23%)2653(Top 54%)
23M23.00 mi1.25 mi14264+4414390+2354390+2357038(Top 26%)1199(Top 10%)1199(Top 25%)
24M24.00 mi1.00 mi13909+3554202+1884202+1886673(Top 25%)1155(Top 10%)1155(Top 24%)
40K24.85 mi0.85 mi13502+4073960+2423960+2424392(Top 16%)496(Top 4%)496(Top 10%)
25.2M25.20 mi0.35 mi13314+1883862+983862+984668(Top 18%)640(Top 6%)640(Top 13%)
Finish26.22 mi1.02 mi12944+3703671+1913671+1914236(Top 16%)522(Top 5%)522(Top 11%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21story building
+97ft-345ft

Overall

16391

Females

5523

F18-39

5523

5K→10K

3.1 - 6.2 mi

Top 65%
×5story building
+79ft-138ft

Overall

17363

Females

6096

F18-39

6096

10K→15K

6.2 - 9.3 mi

Top 62%
×3story building
+67ft-78ft

Overall

16391

Females

5523

F18-39

5523

15K→20K

9.3 - 12.4 mi

Top 58%
×5story building
+106ft-86ft

Overall

15312

Females

4903

F18-39

4903

20K→Half

12.4 - 13.1 mi

Top 61%
×2story building
+19ft-37ft

Overall

16197

Females

5398

F18-39

5398

Half→25K

13.1 - 15.5 mi

Top 55%
×4story building
+66ft-88ft

Overall

14638

Females

4606

F18-39

4606

25K→30K

15.5 - 18.6 mi

Top 49%
×9story building
+181ft-148ft

Overall

13115

Females

3819

F18-39

3819

30K→20M

18.6 - 20.0 mi

Top 45%
×5story building
+64ft-50ft

Overall

11915

Females

3231

F18-39

3231

20M→21M

20.0 - 21.0 mi

Top 29%
×8story building
+106ft-24ft

Overall

7845

Females

1460

F18-39

1460

21M→35K

21.0 - 21.8 mi

Top 40%
×7story building
+17ft-86ft

Overall

10553

Females

2653

F18-39

2653

35K→23M

21.8 - 23.0 mi

Top 26%
×5story building
+23ft-63ft

Overall

7038

Females

1199

F18-39

1199

23M→24M

23.0 - 24.0 mi

Top 25%
×6story building
+12ft-82ft

Overall

6673

Females

1155

F18-39

1155

24M→40K

24.0 - 24.9 mi

Top 16%
×1story
+6ft-20ft

Overall

4392

Females

496

F18-39

496

40K→25.2M

24.9 - 25.2 mi

Top 18%
×1story
+13ft-16ft

Overall

4668

Females

640

F18-39

640

25.2M→Finish

25.2 - 26.2 mi

Top 16%
×2story building
+22ft-21ft

Overall

4236

Females

522

F18-39

522

Passing Analysis

Category:
Athletes Passed
4608
Passed By
588
Net Change
+4020
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16964
5K → 10K232413-181#16964#17145
10K → 15K37292+280#17145#16865
15K → 20K41533+382#16865#16483
20K → Half3717+20#16483#16463
Half → 25K34818+330#16463#16133
25K → 30K56811+557#16133#15576
30K → 20M2843+281#15576#15295
20M → 21M4230+423#15295#14872
21M → 35K1670+167#14872#14705
35K → 23M4410+441#14705#14264
23M → 24M3550+355#14264#13909
24M → 40K4070+407#13909#13502
40K → 25.2M1880+188#13502#13314
25.2M → Finish3711+370#13314#12944
TOTALS4608588+4020
📊

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