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BOSTON MARATHON 2023

Lei Liu

Bib: 11817•M

TX

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 36%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 40%
Division (M50-54)
#0 / 2052
Top 38%
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
7:34/mi
23:31
↑ 97↓ 3451.5%
10K· 6.21 mi
7:30/mi
46:50
↑ 79↓ 1380.4%
15K· 9.32 mi
7:25/mi
1:09:54
↑ 67↓ 78
20K· 12.43 mi
7:33/mi
1:33:21
↑ 106↓ 860.1%
Half· 13.11 mi
7:27/mi
1:38:26
↑ 19↓ 370.5%
25K· 15.53 mi
7:41/mi
1:57:04
↑ 66↓ 880.2%
30K· 18.64 mi
7:51/mi
2:21:28
↑ 181↓ 1480.2%
20M
7:58/mi
2:32:18
↑ 64↓ 500.2%
21M
8:32/mi
2:40:50
↑ 106↓ 241.6%
35K· 21.75 mi
7:32/mi
2:46:28
↑ 17↓ 861.7%
23M
7:53/mi
2:56:20
↑ 23↓ 630.6%
24M
7:52/mi
3:04:12
↓ 821.3%
40K· 24.85 mi
7:45/mi
3:10:50
↓ 200.3%
25.2M
8:33/mi
3:13:47
↑ 13↓ 160.2%
Finish· 26.22 mi
7:36/mi
3:21:32
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:38:26
Pace7:31 /mi
2nd Half
Distance13.11 mi
Time1:43:06
Pace7:52 /mi
📊Positive Split: 4.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:50:5423:317:3423:31
7:34
-
10K
6.21 mi11:14:1346:507:3223:19
7:30
-0:04
15K
9.32 mi11:37:171:09:547:3023:04
7:25
-0:05
20K
12.43 mi12:00:441:33:217:3123:27
7:33
+0:08
Half
13.11 mi12:05:491:38:267:315:05
7:27
-0:06
25K
15.53 mi12:24:271:57:047:3218:38
7:41
+0:14
30K
18.64 mi12:48:512:21:287:3524:24
7:51
+0:10
20M
20.00 mi12:59:412:32:187:3710:50
7:58
+0:07
21M
21.00 mi13:08:132:40:507:408:32
8:32
+0:34
35K
21.75 mi13:13:512:46:287:395:38
7:32
-1:00
23M
23.00 mi13:23:432:56:207:409:52
7:53
+0:21
24M
24.00 mi13:31:353:04:127:417:52
7:52
-0:01
40K
24.85 mi13:38:133:10:507:416:38
7:45
-0:07
25.2M
25.20 mi13:41:103:13:477:412:57
8:33
+0:48
Finish
26.22 mi13:48:553:21:327:427:45
7:36
-0:57

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

7:25 /mi

Average Pace

7:42 /mi

Slowest Pace

8:33 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:10:03

94% of race

Time at Steady Pace

11:29

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:41 /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 mi10:50:5423:317:3423:31
7:34
#10243
10K
6.21 mi11:14:1346:507:3223:19
7:30
#10355
15K
9.32 mi11:37:171:09:547:3023:04
7:25
#10037
20K
12.43 mi12:00:441:33:217:3123:27
7:33
#9931
Half
13.11 mi12:05:491:38:267:315:05
7:27
#9922
25K
15.53 mi12:24:271:57:047:3218:38
7:41
#9933
30K
18.64 mi12:48:512:21:287:3524:24
7:51
#9896
20M
20.00 mi12:59:412:32:187:3710:50
7:58
#9847
21M
21.00 mi13:08:132:40:507:408:32
8:32
#9880
35K
21.75 mi13:13:512:46:287:395:38
7:32
#9831
23M
23.00 mi13:23:432:56:207:409:52
7:53
#9737
24M
24.00 mi13:31:353:04:127:417:52
7:52
#9732
40K
24.85 mi13:38:133:10:507:416:38
7:45
#9651
25.2M
25.20 mi13:41:103:13:477:412:57
8:33
#9629
Finish
26.22 mi13:48:553:21:327:427:45
7:36
#9592
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi10243825382539555(Top 36%)7898(Top 52%)7898(Top 385%)
10K6.21 mi3.10 mi10355-1128336-838336-8310472(Top 39%)8418(Top 55%)8418(Top 410%)
15K9.32 mi3.11 mi10037+3188179+1578179+1579555(Top 36%)7898(Top 52%)7898(Top 385%)
20K12.43 mi3.11 mi9931+1068109+708109+709687(Top 36%)7899(Top 52%)7899(Top 385%)
Half13.11 mi0.68 mi9922+98104+58104+59770(Top 37%)7963(Top 52%)7963(Top 388%)
25K15.53 mi2.42 mi9933-118098+68098+610173(Top 38%)8081(Top 53%)8081(Top 394%)
30K18.64 mi3.11 mi9896+378036+628036+629760(Top 37%)7700(Top 51%)7700(Top 375%)
20M20.00 mi1.36 mi9847+497986+507986+5010041(Top 38%)7774(Top 51%)7774(Top 379%)
21M21.00 mi1.00 mi9880-337975+117975+1110651(Top 40%)7931(Top 52%)7931(Top 387%)
35K21.75 mi0.75 mi9831+497931+447931+448716(Top 33%)6933(Top 46%)6933(Top 338%)
23M23.00 mi1.25 mi9737+947844+877844+878935(Top 34%)6935(Top 46%)6935(Top 338%)
24M24.00 mi1.00 mi9732+57816+287816+2810249(Top 38%)7522(Top 50%)7522(Top 367%)
40K24.85 mi0.85 mi9651+817752+647752+648376(Top 31%)6482(Top 43%)6482(Top 316%)
25.2M25.20 mi0.35 mi9629+227715+377715+379812(Top 37%)7198(Top 47%)7198(Top 351%)
Finish26.22 mi1.02 mi9592+377666+497666+499294(Top 35%)6914(Top 46%)6914(Top 337%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 36%
×21story building
+97ft-345ft

Overall

9555

Males

7898

M50-54

7898

5K→10K

3.1 - 6.2 mi

Top 39%
×5story building
+79ft-138ft

Overall

10472

Males

8418

M50-54

8418

10K→15K

6.2 - 9.3 mi

Top 36%
×3story building
+67ft-78ft

Overall

9555

Males

7898

M50-54

7898

15K→20K

9.3 - 12.4 mi

Top 36%
×5story building
+106ft-86ft

Overall

9687

Males

7899

M50-54

7899

20K→Half

12.4 - 13.1 mi

Top 37%
×2story building
+19ft-37ft

Overall

9770

Males

7963

M50-54

7963

Half→25K

13.1 - 15.5 mi

Top 38%
×4story building
+66ft-88ft

Overall

10173

Males

8081

M50-54

8081

25K→30K

15.5 - 18.6 mi

Top 37%
×9story building
+181ft-148ft

Overall

9760

Males

7700

M50-54

7700

30K→20M

18.6 - 20.0 mi

Top 38%
×5story building
+64ft-50ft

Overall

10041

Males

7774

M50-54

7774

20M→21M

20.0 - 21.0 mi

Top 40%
×8story building
+106ft-24ft

Overall

10651

Males

7931

M50-54

7931

21M→35K

21.0 - 21.8 mi

Top 33%
×7story building
+17ft-86ft

Overall

8716

Males

6933

M50-54

6933

35K→23M

21.8 - 23.0 mi

Top 34%
×5story building
+23ft-63ft

Overall

8935

Males

6935

M50-54

6935

23M→24M

23.0 - 24.0 mi

Top 38%
×6story building
+12ft-82ft

Overall

10249

Males

7522

M50-54

7522

24M→40K

24.0 - 24.9 mi

Top 31%
×1story
+6ft-20ft

Overall

8376

Males

6482

M50-54

6482

40K→25.2M

24.9 - 25.2 mi

Top 37%
×1story
+13ft-16ft

Overall

9812

Males

7198

M50-54

7198

25.2M→Finish

25.2 - 26.2 mi

Top 35%
×2story building
+22ft-21ft

Overall

9294

Males

6914

M50-54

6914

Passing Analysis

Category:
Athletes Passed
1860*
Passed By
1207
Net Change
+651
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10243
5K → 10K250*362-112#10243#10355
10K → 15K37153+318#10355#10037
15K → 20K231*125+106#10037#9931
20K → Half2920+9#9931#9922
Half → 25K114124-11#9922#9933
25K → 30K169*132+37#9933#9896
30K → 20M11061+49#9896#9847
20M → 21M74106-33#9847#9880
21M → 35K6617+49#9880#9831
35K → 23M13642+94#9831#9737
23M → 24M6661+5#9737#9732
24M → 40K106*25+81#9732#9651
40K → 25.2M5331+22#9651#9629
25.2M → Finish8548+37#9629#9592
TOTALS1860*1207+651

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

📊

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