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BOSTON MARATHON 2023

Jonathan Ichikawa

Bib: 4172•M

BC

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 10%
Gender (Male)
#0 / 15176
Top 17%
Masters (Masters Men)
#0 / 9891
Top 6%
Division (M40-44)
#0 / 2241
Top 16%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:34
Rank: #3032
Start → 5K
20:34 | 6:37/mi
10K· 6.21 mi
41:13
Rank: #3409 (-377)
5K → 10K
20:39 | 6:39/mi
15K· 9.32 mi
1:02:07
Rank: #3669 (-260)
10K → 15K
20:54 | 6:44/mi
20K· 12.43 mi
1:23:03
Rank: #3711 (-42)
15K → 20K
20:56 | 6:44/mi
Half· 13.11 mi
1:27:34
Rank: #3706 (+5)
20K → Half
4:31 | 6:37/mi
25K· 15.53 mi
1:43:58
Rank: #3715 (-9)
Half → 25K
16:24 | 6:46/mi
30K· 18.64 mi
2:05:10
Rank: #3572 (+143)
25K → 30K
21:12 | 6:49/mi
20M
2:14:20
Rank: #3429 (+143)
30K → 20M
9:10 | 6:45/mi
21M
2:21:21
Rank: #3305 (+124)
20M → 21M
7:01 | 7:01/mi
35K· 21.75 mi
2:26:18
Rank: #3278 (+27)
21M → 35K
4:57 | 6:37/mi
23M
2:34:33
Rank: #3125 (+153)
35K → 23M
8:15 | 6:35/mi
24M
2:40:41
Rank: #2941 (+184)
23M → 24M
6:08 | 6:08/mi
40K· 24.85 mi
2:46:11
Rank: #2826 (+115)
24M → 40K
5:30 | 6:26/mi
25.2M
2:48:33
Rank: #2772 (+54)
40K → 25.2M
2:22 | 6:52/mi
Finish· 26.22 mi
2:54:52
Rank: #2669 (+103)
25.2M → Finish
6:19 | 6:12/mi

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:27:34
Pace6:41 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:27:18
Pace6:40 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:2120:346:3720:34
6:37
-
10K
6.21 mi10:43:0041:136:3820:39
6:39
+0:02
15K
9.32 mi11:03:541:02:076:4020:54
6:44
+0:05
20K
12.43 mi11:24:501:23:036:4120:56
6:44
0:00
Half
13.11 mi11:29:211:27:346:414:31
6:37
-0:07
25K
15.53 mi11:45:451:43:586:4216:24
6:46
+0:09
30K
18.64 mi12:06:572:05:106:4321:12
6:49
+0:03
20M
20.00 mi12:16:072:14:206:439:10
6:45
-0:04
21M
21.00 mi12:23:082:21:216:447:01
7:01
+0:16
35K
21.75 mi12:28:052:26:186:444:57
6:37
-0:24
23M
23.00 mi12:36:202:34:336:438:15
6:35
-0:02
24M
24.00 mi12:42:282:40:416:426:08
6:08
-0:27
40K
24.85 mi12:47:582:46:116:415:30
6:26
+0:18
25.2M
25.20 mi12:50:202:48:336:412:22
6:52
+0:26
Finish
26.22 mi12:56:392:54:526:406:19
6:12
-0:40

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

6:08 /mi

Average Pace

6:40 /mi

Slowest Pace

7:01 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:58:43

68% of race

Time at Steady Pace

56:09

32% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:40 /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 mi10:22:2120:346:3720:34
6:37
#3032
10K
6.21 mi10:43:0041:136:3820:39
6:39
#3409
15K
9.32 mi11:03:541:02:076:4020:54
6:44
#3669
20K
12.43 mi11:24:501:23:036:4120:56
6:44
#3711
Half
13.11 mi11:29:211:27:346:414:31
6:37
#3706
25K
15.53 mi11:45:451:43:586:4216:24
6:46
#3715
30K
18.64 mi12:06:572:05:106:4321:12
6:49
#3572
20M
20.00 mi12:16:072:14:206:439:10
6:45
#3429
21M
21.00 mi12:23:082:21:216:447:01
7:01
#3305
35K
21.75 mi12:28:052:26:186:444:57
6:37
#3278
23M
23.00 mi12:36:202:34:336:438:15
6:35
#3125
24M
24.00 mi12:42:282:40:416:426:08
6:08
#2941
40K
24.85 mi12:47:582:46:116:415:30
6:26
#2826
25.2M
25.20 mi12:50:202:48:336:412:22
6:52
#2772
Finish
26.22 mi12:56:392:54:526:406:19
6:12
#2669
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi3032287228724425(Top 17%)4134(Top 27%)4134(Top 184%)
10K6.21 mi3.10 mi3409-3773223-3513223-3513880(Top 15%)3653(Top 24%)3653(Top 163%)
15K9.32 mi3.11 mi3669-2603465-2423465-2424425(Top 17%)4134(Top 27%)4134(Top 184%)
20K12.43 mi3.11 mi3711-423510-453510-453897(Top 15%)3672(Top 24%)3672(Top 164%)
Half13.11 mi0.68 mi3706+53503+73503+73694(Top 14%)3480(Top 23%)3480(Top 155%)
25K15.53 mi2.42 mi3715-93512-93512-93872(Top 15%)3640(Top 24%)3640(Top 162%)
30K18.64 mi3.11 mi3572+1433381+1313381+1313160(Top 12%)2976(Top 20%)2976(Top 133%)
20M20.00 mi1.36 mi3429+1433245+1363245+1362532(Top 10%)2399(Top 16%)2399(Top 107%)
21M21.00 mi1.00 mi3305+1243132+1133132+1132251(Top 8%)2125(Top 14%)2125(Top 95%)
35K21.75 mi0.75 mi3278+273104+283104+283167(Top 12%)2952(Top 19%)2952(Top 132%)
23M23.00 mi1.25 mi3125+1532963+1412963+1411754(Top 7%)1663(Top 11%)1663(Top 74%)
24M24.00 mi1.00 mi2941+1842796+1672796+167854(Top 3%)809(Top 5%)809(Top 36%)
40K24.85 mi0.85 mi2826+1152687+1092687+1091351(Top 5%)1274(Top 8%)1274(Top 57%)
25.2M25.20 mi0.35 mi2772+542634+532634+531396(Top 5%)1313(Top 9%)1313(Top 59%)
Finish26.22 mi1.02 mi2669+1032543+912543+911298(Top 5%)1228(Top 8%)1228(Top 55%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 17%
×21stories
+97ft-345ft

Overall

4425

Males

4134

M40-44

4134

5K→10K

3.1 - 6.2 mi

Top 15%
×5stories
+79ft-138ft

Overall

3880

Males

3653

M40-44

3653

10K→15K

6.2 - 9.3 mi

Top 17%
×3stories
+67ft-78ft

Overall

4425

Males

4134

M40-44

4134

15K→20K

9.3 - 12.4 mi

Top 15%
×5stories
+106ft-86ft

Overall

3897

Males

3672

M40-44

3672

20K→Half

12.4 - 13.1 mi

Top 14%
×2stories
+19ft-37ft

Overall

3694

Males

3480

M40-44

3480

Half→25K

13.1 - 15.5 mi

Top 15%
×4stories
+66ft-88ft

Overall

3872

Males

3640

M40-44

3640

25K→30K

15.5 - 18.6 mi

Top 12%
×9stories
+181ft-148ft

Overall

3160

Males

2976

M40-44

2976

30K→20M

18.6 - 20.0 mi

Top 10%
×5stories
+64ft-50ft

Overall

2532

Males

2399

M40-44

2399

20M→21M

20.0 - 21.0 mi

Top 8%
×8stories
+106ft-24ft

Overall

2251

Males

2125

M40-44

2125

21M→35K

21.0 - 21.8 mi

Top 12%
×7stories
+17ft-86ft

Overall

3167

Males

2952

M40-44

2952

35K→23M

21.8 - 23.0 mi

Top 7%
×5stories
+23ft-63ft

Overall

1754

Males

1663

M40-44

1663

23M→24M

23.0 - 24.0 mi

Top 3%
×6stories
+12ft-82ft

Overall

854

Males

809

M40-44

809

24M→40K

24.0 - 24.9 mi

Top 5%
×1story
+6ft-20ft

Overall

1351

Males

1274

M40-44

1274

40K→25.2M

24.9 - 25.2 mi

Top 5%
×1story
+13ft-16ft

Overall

1396

Males

1313

M40-44

1313

25.2M→Finish

25.2 - 26.2 mi

Top 5%
×2stories
+22ft-21ft

Overall

1298

Males

1228

M40-44

1228

Passing Analysis

Category:
Athletes Passed
1391
Passed By
1028
Net Change
+363
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3032
5K → 10K56433-377#3032#3409
10K → 15K35295-260#3409#3669
15K → 20K81123-42#3669#3711
20K → Half1813+5#3711#3706
Half → 25K8089-9#3706#3715
25K → 30K18138+143#3715#3572
30K → 20M1518+143#3572#3429
20M → 21M1328+124#3429#3305
21M → 35K3912+27#3305#3278
35K → 23M1585+153#3278#3125
23M → 24M1840+184#3125#2941
24M → 40K1161+115#2941#2826
40K → 25.2M540+54#2826#2772
25.2M → Finish1063+103#2772#2669
TOTALS13911028+363
📊

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