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BOSTON MARATHON 2023

James Zhao

Bib: 31874•M

NY

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M50-54)
#0 / 2052
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
9:47/mi
30:24
↑ 97↓ 3451.5%
10K· 6.21 mi
9:56/mi
1:01:17
↑ 79↓ 1380.4%
15K· 9.32 mi
9:34/mi
1:30:59
↑ 67↓ 78
20K· 12.43 mi
9:36/mi
2:00:47
↑ 106↓ 860.1%
Half· 13.11 mi
9:24/mi
2:07:12
↑ 19↓ 370.5%
25K· 15.53 mi
9:39/mi
2:30:37
↑ 66↓ 880.2%
30K· 18.64 mi
9:35/mi
3:00:24
↑ 181↓ 1480.2%
20M
9:51/mi
3:13:48
↑ 64↓ 500.2%
21M
9:51/mi
3:23:39
↑ 106↓ 241.6%
35K· 21.75 mi
9:28/mi
3:30:44
↑ 17↓ 861.7%
23M
10:17/mi
3:43:37
↑ 23↓ 630.6%
24M
9:53/mi
3:53:30
↓ 821.3%
40K· 24.85 mi
10:22/mi
4:02:22
↓ 200.3%
25.2M
10:58/mi
4:06:09
↑ 13↓ 160.2%
Finish· 26.22 mi
10:36/mi
4:16:57
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:07:12
Pace9:42 /mi
2nd Half
Distance13.11 mi
Time2:09:45
Pace9:54 /mi
📊Positive Split: 2.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:55:0530:249:4730:24
9:47
-
10K
6.21 mi12:25:581:01:179:5230:53
9:56
+0:09
15K
9.32 mi12:55:401:30:599:4629:42
9:34
-0:22
20K
12.43 mi13:25:282:00:479:4329:48
9:36
+0:02
Half
13.11 mi13:31:532:07:129:426:25
9:24
-0:12
25K
15.53 mi13:55:182:30:379:4223:25
9:39
+0:15
30K
18.64 mi14:25:053:00:249:4129:47
9:35
-0:04
20M
20.00 mi14:38:293:13:489:4113:24
9:51
+0:16
21M
21.00 mi14:48:203:23:399:429:51
9:51
0:00
35K
21.75 mi14:55:253:30:449:417:05
9:28
-0:23
23M
23.00 mi15:08:183:43:379:4312:53
10:17
+0:49
24M
24.00 mi15:18:113:53:309:449:53
9:53
-0:24
40K
24.85 mi15:27:034:02:229:458:52
10:22
+0:29
25.2M
25.20 mi15:30:504:06:099:463:47
10:58
+0:36
Finish
26.22 mi15:41:384:16:579:4810:48
10:36
-0:22

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

9:24 /mi

Average Pace

9:48 /mi

Slowest Pace

10:58 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:53:30

91% of race

Time at Steady Pace

23:27

9% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 9:48 /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 mi11:55:0530:249:4730:24
9:47
#22864
10K
6.21 mi12:25:581:01:179:5230:53
9:56
#23310
15K
9.32 mi12:55:401:30:599:4629:42
9:34
#23041
20K
12.43 mi13:25:282:00:479:4329:48
9:36
#22722
Half
13.11 mi13:31:532:07:129:426:25
9:24
#22686
25K
15.53 mi13:55:182:30:379:4223:25
9:39
#22462
30K
18.64 mi14:25:053:00:249:4129:47
9:35
#21997
20M
20.00 mi14:38:293:13:489:4113:24
9:51
#21845
21M
21.00 mi14:48:203:23:399:429:51
9:51
#21636
35K
21.75 mi14:55:253:30:449:417:05
9:28
#21572
23M
23.00 mi15:08:183:43:379:4312:53
10:17
#21524
24M
24.00 mi15:18:113:53:309:449:53
9:53
#21475
40K
24.85 mi15:27:034:02:229:458:52
10:22
#21447
25.2M
25.20 mi15:30:504:06:099:463:47
10:58
#21433
Finish
26.22 mi15:41:384:16:579:4810:48
10:36
#21515
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi22864135311353122413(Top 84%)13373(Top 88%)13373(Top 652%)
10K6.21 mi3.10 mi23310-44613757-22613757-22623577(Top 89%)13885(Top 91%)13885(Top 677%)
15K9.32 mi3.11 mi23041+26913643+11413643+11422413(Top 84%)13373(Top 88%)13373(Top 652%)
20K12.43 mi3.11 mi22722+31913504+13913504+13921822(Top 82%)13105(Top 86%)13105(Top 639%)
Half13.11 mi0.68 mi22686+3613477+2713477+2721814(Top 82%)13096(Top 86%)13096(Top 638%)
25K15.53 mi2.42 mi22462+22413353+12413353+12421321(Top 80%)12850(Top 85%)12850(Top 626%)
30K18.64 mi3.11 mi21997+46513144+20913144+20919741(Top 74%)12108(Top 80%)12108(Top 590%)
20M20.00 mi1.36 mi21845+15213066+7813066+7820036(Top 75%)12134(Top 80%)12134(Top 591%)
21M21.00 mi1.00 mi21636+20912964+10212964+10217478(Top 66%)10979(Top 72%)10979(Top 535%)
35K21.75 mi0.75 mi21572+6412927+3712927+3719739(Top 74%)11945(Top 79%)11945(Top 582%)
23M23.00 mi1.25 mi21524+4812890+3712890+3720805(Top 78%)12373(Top 82%)12373(Top 603%)
24M24.00 mi1.00 mi21475+4912855+3512855+3520458(Top 77%)12199(Top 80%)12199(Top 594%)
40K24.85 mi0.85 mi21447+2812830+2512830+2520908(Top 79%)12339(Top 81%)12339(Top 601%)
25.2M25.20 mi0.35 mi21433+1412820+1012820+1020377(Top 77%)12104(Top 80%)12104(Top 590%)
Finish26.22 mi1.02 mi21515-8212850-3012850-3023199(Top 87%)13428(Top 88%)13428(Top 654%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 84%
×21story building
+97ft-345ft

Overall

22413

Males

13373

M50-54

13373

5K→10K

3.1 - 6.2 mi

Top 89%
×5story building
+79ft-138ft

Overall

23577

Males

13885

M50-54

13885

10K→15K

6.2 - 9.3 mi

Top 84%
×3story building
+67ft-78ft

Overall

22413

Males

13373

M50-54

13373

15K→20K

9.3 - 12.4 mi

Top 82%
×5story building
+106ft-86ft

Overall

21822

Males

13105

M50-54

13105

20K→Half

12.4 - 13.1 mi

Top 82%
×2story building
+19ft-37ft

Overall

21814

Males

13096

M50-54

13096

Half→25K

13.1 - 15.5 mi

Top 80%
×4story building
+66ft-88ft

Overall

21321

Males

12850

M50-54

12850

25K→30K

15.5 - 18.6 mi

Top 74%
×9story building
+181ft-148ft

Overall

19741

Males

12108

M50-54

12108

30K→20M

18.6 - 20.0 mi

Top 75%
×5story building
+64ft-50ft

Overall

20036

Males

12134

M50-54

12134

20M→21M

20.0 - 21.0 mi

Top 66%
×8story building
+106ft-24ft

Overall

17478

Males

10979

M50-54

10979

21M→35K

21.0 - 21.8 mi

Top 74%
×7story building
+17ft-86ft

Overall

19739

Males

11945

M50-54

11945

35K→23M

21.8 - 23.0 mi

Top 78%
×5story building
+23ft-63ft

Overall

20805

Males

12373

M50-54

12373

23M→24M

23.0 - 24.0 mi

Top 77%
×6story building
+12ft-82ft

Overall

20458

Males

12199

M50-54

12199

24M→40K

24.0 - 24.9 mi

Top 79%
×1story
+6ft-20ft

Overall

20908

Males

12339

M50-54

12339

40K→25.2M

24.9 - 25.2 mi

Top 77%
×1story
+13ft-16ft

Overall

20377

Males

12104

M50-54

12104

25.2M→Finish

25.2 - 26.2 mi

Top 87%
×2story building
+22ft-21ft

Overall

23199

Males

13428

M50-54

13428

Passing Analysis

Category:
Athletes Passed
2163
Passed By
814
Net Change
+1349
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22864
5K → 10K71517-446#22864#23310
10K → 15K31142+269#23310#23041
15K → 20K33516+319#23041#22722
20K → Half426+36#22722#22686
Half → 25K23410+224#22686#22462
25K → 30K4672+465#22462#21997
30K → 20M16412+152#21997#21845
20M → 21M2090+209#21845#21636
21M → 35K728+64#21636#21572
35K → 23M8840+48#21572#21524
23M → 24M6920+49#21524#21475
24M → 40K5830+28#21475#21447
40K → 25.2M2511+14#21447#21433
25.2M → Finish18100-82#21433#21515
TOTALS2163814+1349
📊

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