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BOSTON MARATHON 2025

Ritsuko Iizuka

Bib: 18792•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 48%
Masters (Masters Women)
#0 / 6759
Top 37%
Division (F45-49)
#0 / 1813
Top 46%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:45
Rank: #16345
Start → 5K
24:45 | 7:58/mi
10K· 6.21 mi
48:44
Rank: #15186 (+1159)
5K → 10K
23:59 | 7:43/mi
15K· 9.32 mi
1:13:21
Rank: #15241 (-55)
10K → 15K
24:37 | 7:55/mi
20K· 12.43 mi
1:40:18
Rank: #16463 (-1222)
15K → 20K
26:57 | 8:40/mi
Half· 13.11 mi
1:45:40
Rank: #16387 (+76)
20K → Half
5:22 | 7:52/mi
25K· 15.53 mi
2:05:47
Rank: #16310 (+77)
Half → 25K
20:07 | 8:18/mi
30K· 18.64 mi
2:33:16
Rank: #16361 (-51)
25K → 30K
27:29 | 8:51/mi
20M
2:45:54
Rank: #16477 (-116)
30K → 20M
12:38 | 9:18/mi
21M
2:55:35
Rank: #16461 (+16)
20M → 21M
9:41 | 9:41/mi
35K· 21.75 mi
3:02:03
Rank: #16422 (+39)
21M → 35K
6:28 | 8:39/mi
23M
3:13:46
Rank: #16505 (-83)
35K → 23M
11:43 | 9:21/mi
24M
3:22:43
Rank: #16526 (-21)
23M → 24M
8:57 | 8:57/mi
40K· 24.85 mi
3:30:45
Rank: #16605 (-79)
24M → 40K
8:02 | 9:24/mi
25.2M
3:34:11
Rank: #16615 (-10)
40K → 25.2M
3:26 | 9:57/mi
Finish· 26.22 mi
3:43:39
Rank: #16787 (-172)
25.2M → Finish
9:28 | 9:17/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:45:40
Pace8:04 /mi
2nd Half
Distance13.11 mi
Time1:57:59
Pace9:00 /mi
📊Positive Split: 11.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:41:4724:457:5824:45
7:58
-
10K
6.21 mi12:05:4648:447:5123:59
7:43
-0:15
15K
9.32 mi12:30:231:13:217:5224:37
7:55
+0:12
20K
12.43 mi12:57:201:40:188:0426:57
8:40
+0:45
Half
13.11 mi13:02:421:45:408:045:22
7:52
-0:48
25K
15.53 mi13:22:492:05:478:0620:07
8:18
+0:26
30K
18.64 mi13:50:182:33:168:1327:29
8:51
+0:33
20M
20.00 mi14:02:562:45:548:1812:38
9:18
+0:27
21M
21.00 mi14:12:372:55:358:229:41
9:41
+0:23
35K
21.75 mi14:19:053:02:038:226:28
8:39
-1:02
23M
23.00 mi14:30:483:13:468:2511:43
9:21
+0:42
24M
24.00 mi14:39:453:22:438:278:57
8:57
-0:24
40K
24.85 mi14:47:473:30:458:298:02
9:24
+0:27
25.2M
25.20 mi14:51:133:34:118:303:26
9:57
+0:33
Finish
26.22 mi15:00:413:43:398:329:28
9:17
-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

7:43 /mi

Average Pace

8:32 /mi

Slowest Pace

9:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:38:50

44% of race

Time at Steady Pace

1:09:51

31% of race

Time at Slower Pace

54:58

25% of race

Average Pace: 8:32 /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 mi11:41:4724:457:5824:45
7:58
#16345
10K
6.21 mi12:05:4648:447:5123:59
7:43
#15186
15K
9.32 mi12:30:231:13:217:5224:37
7:55
#15241
20K
12.43 mi12:57:201:40:188:0426:57
8:40
#16463
Half
13.11 mi13:02:421:45:408:045:22
7:52
#16387
25K
15.53 mi13:22:492:05:478:0620:07
8:18
#16310
30K
18.64 mi13:50:182:33:168:1327:29
8:51
#16361
20M
20.00 mi14:02:562:45:548:1812:38
9:18
#16477
21M
21.00 mi14:12:372:55:358:229:41
9:41
#16461
35K
21.75 mi14:19:053:02:038:226:28
8:39
#16422
23M
23.00 mi14:30:483:13:468:2511:43
9:21
#16505
24M
24.00 mi14:39:453:22:438:278:57
8:57
#16526
40K
24.85 mi14:47:473:30:458:298:02
9:24
#16605
25.2M
25.20 mi14:51:133:34:118:303:26
9:57
#16615
Finish
26.22 mi15:00:413:43:398:329:28
9:17
#16787
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi163455358535815437(Top 54%)4831(Top 40%)4831(Top 266%)
10K6.21 mi3.10 mi15186+11594654+7044654+70414091(Top 50%)4012(Top 33%)4012(Top 221%)
15K9.32 mi3.11 mi15241-554702-484702-4815437(Top 54%)4831(Top 40%)4831(Top 266%)
20K12.43 mi3.11 mi16463-12225410-7085410-70819284(Top 68%)7070(Top 58%)7070(Top 390%)
Half13.11 mi0.68 mi16387+765370+405370+4014900(Top 52%)4578(Top 37%)4578(Top 253%)
25K15.53 mi2.42 mi16310+775347+235347+2315918(Top 56%)5269(Top 43%)5269(Top 291%)
30K18.64 mi3.11 mi16361-515448-1015448-10116876(Top 59%)5968(Top 49%)5968(Top 329%)
20M20.00 mi1.36 mi16477-1165542-945542-9418288(Top 64%)6879(Top 56%)6879(Top 379%)
21M21.00 mi1.00 mi16461+165565-235565-2316965(Top 60%)6236(Top 51%)6236(Top 344%)
35K21.75 mi0.75 mi16422+395556+95556+916364(Top 58%)5984(Top 49%)5984(Top 330%)
23M23.00 mi1.25 mi16505-835637-815637-8118051(Top 64%)7000(Top 57%)7000(Top 386%)
24M24.00 mi1.00 mi16526-215677-405677-4017127(Top 60%)6562(Top 54%)6562(Top 362%)
40K24.85 mi0.85 mi16605-795752-755752-7518275(Top 64%)7253(Top 59%)7253(Top 400%)
25.2M25.20 mi0.35 mi16615-105769-175769-1716859(Top 59%)6513(Top 53%)6513(Top 359%)
Finish26.22 mi1.02 mi16787-1725898-1295898-12920347(Top 72%)8310(Top 68%)8310(Top 458%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 54%
×21stories
+97ft-345ft

Overall

15437

Females

4831

F45-49

4831

5K→10K

3.1 - 6.2 mi

Top 50%
×5stories
+79ft-138ft

Overall

14091

Females

4012

F45-49

4012

10K→15K

6.2 - 9.3 mi

Top 54%
×3stories
+67ft-78ft

Overall

15437

Females

4831

F45-49

4831

15K→20K

9.3 - 12.4 mi

Top 68%
×5stories
+106ft-86ft

Overall

19284

Females

7070

F45-49

7070

20K→Half

12.4 - 13.1 mi

Top 52%
×2stories
+19ft-37ft

Overall

14900

Females

4578

F45-49

4578

Half→25K

13.1 - 15.5 mi

Top 56%
×4stories
+66ft-88ft

Overall

15918

Females

5269

F45-49

5269

25K→30K

15.5 - 18.6 mi

Top 59%
×9stories
+181ft-148ft

Overall

16876

Females

5968

F45-49

5968

30K→20M

18.6 - 20.0 mi

Top 64%
×5stories
+64ft-50ft

Overall

18288

Females

6879

F45-49

6879

20M→21M

20.0 - 21.0 mi

Top 60%
×8stories
+106ft-24ft

Overall

16965

Females

6236

F45-49

6236

21M→35K

21.0 - 21.8 mi

Top 58%
×7stories
+17ft-86ft

Overall

16364

Females

5984

F45-49

5984

35K→23M

21.8 - 23.0 mi

Top 64%
×5stories
+23ft-63ft

Overall

18051

Females

7000

F45-49

7000

23M→24M

23.0 - 24.0 mi

Top 60%
×6stories
+12ft-82ft

Overall

17127

Females

6562

F45-49

6562

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

18275

Females

7253

F45-49

7253

40K→25.2M

24.9 - 25.2 mi

Top 59%
×1story
+13ft-16ft

Overall

16859

Females

6513

F45-49

6513

25.2M→Finish

25.2 - 26.2 mi

Top 72%
×2stories
+22ft-21ft

Overall

20347

Females

8310

F45-49

8310

Passing Analysis

Category:
Athletes Passed
2483
Passed By
2925
Net Change
-442
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16345
5K → 10K119839+1159#16345#15186
10K → 15K198253-55#15186#15241
15K → 20K381260-1222#15241#16463
20K → Half859+76#16463#16387
Half → 25K191114+77#16387#16310
25K → 30K215266-51#16310#16361
30K → 20M73189-116#16361#16477
20M → 21M123107+16#16477#16461
21M → 35K7940+39#16461#16422
35K → 23M95178-83#16422#16505
23M → 24M7394-21#16505#16526
24M → 40K52131-79#16526#16605
40K → 25.2M3141-10#16605#16615
25.2M → Finish32204-172#16615#16787
TOTALS24832925-442
📊

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