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BOSTON MARATHON 2026

Kozo Iizuka

Bib: 30253•M

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0:00
0:00
/ mi
Masters
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Overall
#0 / 29021
Gender (Male)
#0 / 16340
Masters (Masters Men)
#0 / 10617
Age Group (M55-59)
#0 / 1491
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
31:32
3.11 mi
Rank: #26358
Start → 5K
31:32 | 10:09/mi
10K
1:03:37
6.21 mi
Rank: #26480 (-122)
5K → 10K
32:05 | 10:20/mi
15K
1:35:31
9.32 mi
Rank: #26405 (+75)
10K → 15K
31:54 | 10:17/mi
20K
2:07:12
12.43 mi
Rank: #26169 (+236)
15K → 20K
31:41 | 10:12/mi
HALF
2:13:59
13.11 mi
Rank: #26116 (+53)
20K → HALF
6:47 | 9:58/mi
25K
2:39:39
15.53 mi
Rank: #26035 (+81)
HALF → 25K
25:40 | 10:35/mi
30K
3:16:19
18.64 mi
Rank: #26179 (-144)
25K → 30K
36:40 | 11:49/mi
20M
3:32:26
20.00 mi
Rank: #26200 (-21)
30K → 20M
16:07 | 11:52/mi
21M
3:45:42
21.00 mi
Rank: #26250 (-50)
20M → 21M
13:16 | 13:16/mi
35K
3:54:11
21.75 mi
Rank: #26233 (+17)
21M → 35K
8:29 | 11:21/mi
23M
4:08:20
23.00 mi
Rank: #26186 (+47)
35K → 23M
14:09 | 11:19/mi
24M
4:19:21
24.00 mi
Rank: #26153 (+33)
23M → 24M
11:01 | 11:01/mi
40K
4:28:48
24.85 mi
Rank: #26093 (+60)
24M → 40K
9:27 | 11:04/mi
25.2M
4:33:09
25.20 mi
Rank: #26086 (+7)
40K → 25.2M
4:21 | 12:37/mi
FINISH
4:44:28
26.22 mi
Rank: #26096 (-10)
25.2M → FINISH
11:19 | 11:07/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time2:13:59
Pace10:14 /mi
2nd Half
Distance13.11 mi
Time2:30:29
Pace11:29 /mi
📊Positive Split: 12.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:59:0631:3210:0931:32
10:09
-
10K
6.21 mi12:31:111:03:3710:1532:05
10:20
+0:11
15K
9.32 mi13:03:051:35:3110:1531:54
10:17
-0:03
20K
12.43 mi13:34:462:07:1210:1531:41
10:12
-0:05
HALF
13.11 mi13:41:332:13:5910:146:47
9:58
-0:14
25K
15.53 mi14:07:132:39:3910:1725:40
10:35
+0:37
30K
18.64 mi14:43:533:16:1910:3236:40
11:49
+1:14
20M
20.00 mi15:00:003:32:2610:3816:07
11:52
+0:03
21M
21.00 mi15:13:163:45:4210:4513:16
13:16
+1:24
35K
21.75 mi15:21:453:54:1110:478:29
11:21
-1:55
23M
23.00 mi15:35:544:08:2010:4814:09
11:19
-0:02
24M
24.00 mi15:46:554:19:2110:4911:01
11:01
-0:18
40K
24.85 mi15:56:224:28:4810:499:27
11:04
+0:03
25.2M
25.20 mi16:00:434:33:0910:514:21
12:37
+1:33
FINISH
26.22 mi16:12:024:44:2810:5211:19
11:07
-1:30

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

9:58 /mi

Average Pace

10:51 /mi

Slowest Pace

13:16 /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

2:39:39

56% of race

Time at Steady Pace

54:25

19% of race

Time at Slower Pace

1:10:24

25% of race

Average Pace: 10:51 /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 mi11:59:0631:3210:0931:32
10:09
#26358
10K
6.21 mi12:31:111:03:3710:1532:05
10:20
#26480
15K
9.32 mi13:03:051:35:3110:1531:54
10:17
#26405
20K
12.43 mi13:34:462:07:1210:1531:41
10:12
#26169
HALF
13.11 mi13:41:332:13:5910:146:47
9:58
#26116
25K
15.53 mi14:07:132:39:3910:1725:40
10:35
#26035
30K
18.64 mi14:43:533:16:1910:3236:40
11:49
#26179
20M
20.00 mi15:00:003:32:2610:3816:07
11:52
#26200
21M
21.00 mi15:13:163:45:4210:4513:16
13:16
#26250
35K
21.75 mi15:21:453:54:1110:478:29
11:21
#26233
23M
23.00 mi15:35:544:08:2010:4814:09
11:19
#26186
24M
24.00 mi15:46:554:19:2110:4911:01
11:01
#26153
40K
24.85 mi15:56:224:28:4810:499:27
11:04
#26093
25.2M
25.20 mi16:00:434:33:0910:514:21
12:37
#26086
FINISH
26.22 mi16:12:024:44:2810:5211:19
11:07
#26096
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi26358153631536326258(Top 90%)15282(Top 94%)15282(Top 1025%)
10K6.21 mi3.10 mi26480-12215404-4115404-4126582(Top 92%)15420(Top 94%)15420(Top 1034%)
15K9.32 mi3.11 mi26405+7515358+4615358+4626258(Top 90%)15282(Top 94%)15282(Top 1025%)
20K12.43 mi3.11 mi26169+23615247+11115247+11125484(Top 88%)14921(Top 91%)14921(Top 1001%)
HALF13.11 mi0.68 mi26116+5315225+2215225+2225562(Top 88%)14943(Top 91%)14943(Top 1002%)
25K15.53 mi2.42 mi26035+8115178+4715178+4725608(Top 88%)14941(Top 91%)14941(Top 1002%)
30K18.64 mi3.11 mi26179-14415209-3115209-3126526(Top 91%)15237(Top 93%)15237(Top 1022%)
20M20.00 mi1.36 mi26200-2115202+715202+726235(Top 90%)15033(Top 92%)15033(Top 1008%)
21M21.00 mi1.00 mi26250-5015211-915211-926652(Top 92%)15190(Top 93%)15190(Top 1019%)
35K21.75 mi0.75 mi26233+1715197+1415197+1425806(Top 89%)14776(Top 90%)14776(Top 991%)
23M23.00 mi1.25 mi26186+4715163+3415163+3425086(Top 86%)14383(Top 88%)14383(Top 965%)
24M24.00 mi1.00 mi26153+3315137+2615137+2625135(Top 87%)14383(Top 88%)14383(Top 965%)
40K24.85 mi0.85 mi26093+6015093+4415093+4424358(Top 84%)13958(Top 85%)13958(Top 936%)
25.2M25.20 mi0.35 mi26086+715087+615087+625524(Top 88%)14552(Top 89%)14552(Top 976%)
FINISH26.22 mi1.02 mi26096-1015084+315084+326285(Top 91%)14904(Top 91%)14904(Top 1000%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 90%
×21
+97ft-345ft

Overall

26258

Males

15282

M55-59

15282

5K→10K

3.1 - 6.2 mi

Top 92%
×5
+79ft-138ft

Overall

26582

Males

15420

M55-59

15420

10K→15K

6.2 - 9.3 mi

Top 90%
×3
+67ft-78ft

Overall

26258

Males

15282

M55-59

15282

15K→20K

9.3 - 12.4 mi

Top 88%
×5
+106ft-86ft

Overall

25484

Males

14921

M55-59

14921

20K→HALF

12.4 - 13.1 mi

Top 88%
×2
+19ft-37ft

Overall

25562

Males

14943

M55-59

14943

HALF→25K

13.1 - 15.5 mi

Top 88%
×4
+66ft-88ft

Overall

25608

Males

14941

M55-59

14941

25K→30K

15.5 - 18.6 mi

Top 91%
×9
+181ft-148ft

Overall

26526

Males

15237

M55-59

15237

30K→20M

18.6 - 20.0 mi

Top 90%
×5
+64ft-50ft

Overall

26235

Males

15033

M55-59

15033

20M→21M

20.0 - 21.0 mi

Top 92%
×8
+106ft-24ft

Overall

26652

Males

15190

M55-59

15190

21M→35K

21.0 - 21.8 mi

Top 89%
×7
+17ft-86ft

Overall

25806

Males

14776

M55-59

14776

35K→23M

21.8 - 23.0 mi

Top 86%
×5
+23ft-63ft

Overall

25086

Males

14383

M55-59

14383

23M→24M

23.0 - 24.0 mi

Top 87%
×6
+12ft-82ft

Overall

25135

Males

14383

M55-59

14383

24M→40K

24.0 - 24.9 mi

Top 84%
×1
+6ft-20ft

Overall

24358

Males

13958

M55-59

13958

40K→25.2M

24.9 - 25.2 mi

Top 88%
×1
+13ft-16ft

Overall

25524

Males

14552

M55-59

14552

25.2M→FINISH

25.2 - 26.2 mi

Top 91%
×2
+22ft-21ft

Overall

26285

Males

14904

M55-59

14904

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
1172
Passed By
910
Net Change
+262
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#26358
5K → 10K139261-122#26358#26480
10K → 15K16085+75#26480#26405
15K → 20K26731+236#26405#26169
20K → HALF574+53#26169#26116
HALF → 25K12443+81#26116#26035
25K → 30K79223-144#26035#26179
30K → 20M5273-21#26179#26200
20M → 21M2373-50#26200#26250
21M → 35K4124+17#26250#26233
35K → 23M6922+47#26233#26186
23M → 24M5320+33#26186#26153
24M → 40K677+60#26153#26093
40K → 25.2M169+7#26093#26086
25.2M → FINISH2535-10#26086#26096
TOTALS1172910+262
📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
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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Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing