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BOSTON MARATHON 2023

Klaus Ito

Bib: 3977•M

CA

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 6%
Gender (Male)
#0 / 15176
Top 11%
Division (M18-39)
#0 / 5285
Top 25%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K· 3.11 mi
20:40
Rank: #3224
Start → 5K
20:40 | 6:39/mi
10K· 6.21 mi
40:28
Rank: #2580 (+644)
5K → 10K
19:48 | 6:22/mi
15K· 9.32 mi
1:00:19
Rank: #2387 (+193)
10K → 15K
19:51 | 6:23/mi
20K· 12.43 mi
1:20:13
Rank: #2213 (+174)
15K → 20K
19:54 | 6:24/mi
Half· 13.11 mi
1:24:34
Rank: #2202 (+11)
20K → Half
4:21 | 6:23/mi
25K· 15.53 mi
1:40:05
Rank: #2112 (+90)
Half → 25K
15:31 | 6:24/mi
30K· 18.64 mi
2:00:28
Rank: #2030 (+82)
25K → 30K
20:23 | 6:34/mi
20M
2:09:24
Rank: #1991 (+39)
30K → 20M
8:56 | 6:34/mi
21M
2:16:11
Rank: #1935 (+56)
20M → 21M
6:47 | 6:47/mi
35K· 21.75 mi
2:20:53
Rank: #1904 (+31)
21M → 35K
4:42 | 6:17/mi
23M
2:28:59
Rank: #1843 (+61)
35K → 23M
8:06 | 6:28/mi
24M
2:35:20
Rank: #1797 (+46)
23M → 24M
6:21 | 6:21/mi
40K· 24.85 mi
2:40:52
Rank: #1763 (+34)
24M → 40K
5:32 | 6:28/mi
25.2M
2:43:19
Rank: #1759 (+4)
40K → 25.2M
2:27 | 7:06/mi
Finish· 26.22 mi
2:49:40
Rank: #1718 (+41)
25.2M → Finish
6:21 | 6:14/mi

Course Map & Elevation

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:24:34
Pace6:27 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:25:06
Pace6:30 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:0720:406:3920:40
6:39
-
10K
6.21 mi10:41:5540:286:3119:48
6:22
-0:17
15K
9.32 mi11:01:461:00:196:2819:51
6:23
+0:01
20K
12.43 mi11:21:401:20:136:2719:54
6:24
+0:01
Half
13.11 mi11:26:011:24:346:274:21
6:23
-0:01
25K
15.53 mi11:41:321:40:056:2715:31
6:24
+0:01
30K
18.64 mi12:01:552:00:286:2820:23
6:34
+0:10
20M
20.00 mi12:10:512:09:246:288:56
6:34
0:00
21M
21.00 mi12:17:382:16:116:296:47
6:47
+0:13
35K
21.75 mi12:22:202:20:536:294:42
6:17
-0:30
23M
23.00 mi12:30:262:28:596:298:06
6:28
+0:11
24M
24.00 mi12:36:472:35:206:286:21
6:21
-0:07
40K
24.85 mi12:42:192:40:526:285:32
6:28
+0:07
25.2M
25.20 mi12:44:462:43:196:292:27
7:06
+0:38
Finish
26.22 mi12:51:072:49:406:296:21
6:14
-0:52

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

6:14 /mi

Average Pace

6:29 /mi

Slowest Pace

7:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

2:47:13

99% of race

Time at Steady Pace

2:27

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:28 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:22:0720:406:3920:40
6:39
#3224
10K
6.21 mi10:41:5540:286:3119:48
6:22
#2580
15K
9.32 mi11:01:461:00:196:2819:51
6:23
#2387
20K
12.43 mi11:21:401:20:136:2719:54
6:24
#2213
Half
13.11 mi11:26:011:24:346:274:21
6:23
#2202
25K
15.53 mi11:41:321:40:056:2715:31
6:24
#2112
30K
18.64 mi12:01:552:00:286:2820:23
6:34
#2030
20M
20.00 mi12:10:512:09:246:288:56
6:34
#1991
21M
21.00 mi12:17:382:16:116:296:47
6:47
#1935
35K
21.75 mi12:22:202:20:536:294:42
6:17
#1904
23M
23.00 mi12:30:262:28:596:298:06
6:28
#1843
24M
24.00 mi12:36:472:35:206:286:21
6:21
#1797
40K
24.85 mi12:42:192:40:526:285:32
6:28
#1763
25.2M
25.20 mi12:44:462:43:196:292:27
7:06
#1759
Finish
26.22 mi12:51:072:49:406:296:21
6:14
#1718
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi3224304330432030(Top 8%)1945(Top 13%)1945(Top 37%)
10K6.21 mi3.10 mi2580+6442460+5832460+5832093(Top 8%)2004(Top 13%)2004(Top 38%)
15K9.32 mi3.11 mi2387+1932285+1752285+1752030(Top 8%)1945(Top 13%)1945(Top 37%)
20K12.43 mi3.11 mi2213+1742119+1662119+1661814(Top 7%)1737(Top 11%)1737(Top 33%)
Half13.11 mi0.68 mi2202+112109+102109+102080(Top 8%)1996(Top 13%)1996(Top 38%)
25K15.53 mi2.42 mi2112+902026+832026+831715(Top 6%)1641(Top 11%)1641(Top 31%)
30K18.64 mi3.11 mi2030+821947+791947+791798(Top 7%)1721(Top 11%)1721(Top 33%)
20M20.00 mi1.36 mi1991+391907+401907+401728(Top 6%)1648(Top 11%)1648(Top 31%)
21M21.00 mi1.00 mi1935+561851+561851+561362(Top 5%)1299(Top 9%)1299(Top 25%)
35K21.75 mi0.75 mi1904+311823+281823+281516(Top 6%)1440(Top 9%)1440(Top 27%)
23M23.00 mi1.25 mi1843+611763+601763+601330(Top 5%)1261(Top 8%)1261(Top 24%)
24M24.00 mi1.00 mi1797+461718+451718+451508(Top 6%)1427(Top 9%)1427(Top 27%)
40K24.85 mi0.85 mi1763+341685+331685+331441(Top 5%)1360(Top 9%)1360(Top 26%)
25.2M25.20 mi0.35 mi1759+41681+41681+42085(Top 8%)1941(Top 13%)1941(Top 37%)
Finish26.22 mi1.02 mi1718+411642+391642+391381(Top 5%)1306(Top 9%)1306(Top 25%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 8%
×21stories
+97ft-345ft

Overall

2030

Males

1945

M18-39

1945

5K→10K

3.1 - 6.2 mi

Top 8%
×5stories
+79ft-138ft

Overall

2093

Males

2004

M18-39

2004

10K→15K

6.2 - 9.3 mi

Top 8%
×3stories
+67ft-78ft

Overall

2030

Males

1945

M18-39

1945

15K→20K

9.3 - 12.4 mi

Top 7%
×5stories
+106ft-86ft

Overall

1814

Males

1737

M18-39

1737

20K→Half

12.4 - 13.1 mi

Top 8%
×2stories
+19ft-37ft

Overall

2080

Males

1996

M18-39

1996

Half→25K

13.1 - 15.5 mi

Top 6%
×4stories
+66ft-88ft

Overall

1715

Males

1641

M18-39

1641

25K→30K

15.5 - 18.6 mi

Top 7%
×9stories
+181ft-148ft

Overall

1798

Males

1721

M18-39

1721

30K→20M

18.6 - 20.0 mi

Top 6%
×5stories
+64ft-50ft

Overall

1728

Males

1648

M18-39

1648

20M→21M

20.0 - 21.0 mi

Top 5%
×8stories
+106ft-24ft

Overall

1362

Males

1299

M18-39

1299

21M→35K

21.0 - 21.8 mi

Top 6%
×7stories
+17ft-86ft

Overall

1516

Males

1440

M18-39

1440

35K→23M

21.8 - 23.0 mi

Top 5%
×5stories
+23ft-63ft

Overall

1330

Males

1261

M18-39

1261

23M→24M

23.0 - 24.0 mi

Top 6%
×6stories
+12ft-82ft

Overall

1508

Males

1427

M18-39

1427

24M→40K

24.0 - 24.9 mi

Top 5%
×1story
+6ft-20ft

Overall

1441

Males

1360

M18-39

1360

40K→25.2M

24.9 - 25.2 mi

Top 8%
×1story
+13ft-16ft

Overall

2085

Males

1941

M18-39

1941

25.2M→Finish

25.2 - 26.2 mi

Top 5%
×2stories
+22ft-21ft

Overall

1381

Males

1306

M18-39

1306

Passing Analysis

Category:
Athletes Passed
1660
Passed By
154
Net Change
+1506
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3224
5K → 10K6539+644#3224#2580
10K → 15K21017+193#2580#2387
15K → 20K1817+174#2387#2213
20K → Half143+11#2213#2202
Half → 25K988+90#2202#2112
25K → 30K11230+82#2112#2030
30K → 20M5718+39#2030#1991
20M → 21M6711+56#1991#1935
21M → 35K343+31#1935#1904
35K → 23M676+61#1904#1843
23M → 24M537+46#1843#1797
24M → 40K439+34#1797#1763
40K → 25.2M1612+4#1763#1759
25.2M → Finish5514+41#1759#1718
TOTALS1660154+1506
📊

Passing Visuals

Category:

📈Position Graph

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🎨Heatmap Timeline

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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