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BOSTON MARATHON 2025

Waiyung Iu

Bib: 18261•M

BC

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 42%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Top 45%
Division (M55-59)
#0 / 1648
Top 30%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:41
Rank: #10373
Start → 5K
22:41 | 7:18/mi
10K· 6.21 mi
44:49
Rank: #9556 (+817)
5K → 10K
22:08 | 7:07/mi
15K· 9.32 mi
1:07:19
Rank: #9515 (+41)
10K → 15K
22:30 | 7:15/mi
20K· 12.43 mi
1:30:36
Rank: #9780 (-265)
15K → 20K
23:17 | 7:30/mi
Half· 13.11 mi
1:35:36
Rank: #9802 (-22)
20K → Half
5:00 | 7:20/mi
25K· 15.53 mi
1:54:05
Rank: #9945 (-143)
Half → 25K
18:29 | 7:37/mi
30K· 18.64 mi
2:19:33
Rank: #10458 (-513)
25K → 30K
25:28 | 8:12/mi
20M
2:30:51
Rank: #10620 (-162)
30K → 20M
11:18 | 8:19/mi
21M
2:39:54
Rank: #10783 (-163)
20M → 21M
9:03 | 9:03/mi
35K· 21.75 mi
2:47:03
Rank: #11250 (-467)
21M → 35K
7:09 | 9:33/mi
23M
2:57:49
Rank: #11404 (-154)
35K → 23M
10:46 | 8:36/mi
24M
3:06:46
Rank: #11694 (-290)
23M → 24M
8:57 | 8:57/mi
40K· 24.85 mi
3:14:57
Rank: #12048 (-354)
24M → 40K
8:11 | 9:34/mi
25.2M
3:18:12
Rank: #12074 (-26)
40K → 25.2M
3:15 | 9:25/mi
Finish· 26.22 mi
3:26:07
Rank: #12025 (+49)
25.2M → Finish
7:55 | 7:46/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:35:36
Pace7:18 /mi
2nd Half
Distance13.11 mi
Time1:50:31
Pace8:26 /mi
📊Positive Split: 15.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:13:3022:417:1822:41
7:18
-
10K
6.21 mi11:35:3844:497:1322:08
7:07
-0:11
15K
9.32 mi11:58:081:07:197:1322:30
7:15
+0:08
20K
12.43 mi12:21:251:30:367:1723:17
7:30
+0:15
Half
13.11 mi12:26:251:35:367:185:00
7:20
-0:10
25K
15.53 mi12:44:541:54:057:2118:29
7:37
+0:17
30K
18.64 mi13:10:222:19:337:2925:28
8:12
+0:35
20M
20.00 mi13:21:402:30:517:3311:18
8:19
+0:07
21M
21.00 mi13:30:432:39:547:379:03
9:03
+0:44
35K
21.75 mi13:37:522:47:037:417:09
9:33
+0:30
23M
23.00 mi13:48:382:57:497:4410:46
8:36
-0:57
24M
24.00 mi13:57:353:06:467:478:57
8:57
+0:21
40K
24.85 mi14:05:463:14:577:518:11
9:34
+0:37
25.2M
25.20 mi14:09:013:18:127:523:15
9:25
-0:09
Finish
26.22 mi14:16:563:26:077:527:55
7:46
-1:39

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

7:07 /mi

Average Pace

7:52 /mi

Slowest Pace

9:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:02:00

59% of race

Time at Steady Pace

47:32

23% of race

Time at Slower Pace

36:35

18% of race

Average Pace: 7:52 /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 mi11:13:3022:417:1822:41
7:18
#10373
10K
6.21 mi11:35:3844:497:1322:08
7:07
#9556
15K
9.32 mi11:58:081:07:197:1322:30
7:15
#9515
20K
12.43 mi12:21:251:30:367:1723:17
7:30
#9780
Half
13.11 mi12:26:251:35:367:185:00
7:20
#9802
25K
15.53 mi12:44:541:54:057:2118:29
7:37
#9945
30K
18.64 mi13:10:222:19:337:2925:28
8:12
#10458
20M
20.00 mi13:21:402:30:517:3311:18
8:19
#10620
21M
21.00 mi13:30:432:39:547:379:03
9:03
#10783
35K
21.75 mi13:37:522:47:037:417:09
9:33
#11250
23M
23.00 mi13:48:382:57:497:4410:46
8:36
#11404
24M
24.00 mi13:57:353:06:467:478:57
8:57
#11694
40K
24.85 mi14:05:463:14:577:518:11
9:34
#12048
25.2M
25.20 mi14:09:013:18:127:523:15
9:25
#12074
Finish
26.22 mi14:16:563:26:077:527:55
7:46
#12025
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi10373837683769480(Top 33%)7814(Top 49%)7814(Top 474%)
10K6.21 mi3.10 mi9556+8177937+4397937+4398870(Top 31%)7526(Top 47%)7526(Top 457%)
15K9.32 mi3.11 mi9515+417885+527885+529480(Top 33%)7814(Top 49%)7814(Top 474%)
20K12.43 mi3.11 mi9780-2657988-1037988-10310702(Top 38%)8356(Top 52%)8356(Top 507%)
Half13.11 mi0.68 mi9802-228000-128000-1210254(Top 36%)8170(Top 51%)8170(Top 496%)
25K15.53 mi2.42 mi9945-1438043-438043-4310948(Top 39%)8364(Top 52%)8364(Top 508%)
30K18.64 mi3.11 mi10458-5138250-2078250-20712788(Top 45%)9044(Top 56%)9044(Top 549%)
20M20.00 mi1.36 mi10620-1628279-298279-2912571(Top 44%)8803(Top 55%)8803(Top 534%)
21M21.00 mi1.00 mi10783-1638319-408319-4013768(Top 48%)9220(Top 57%)9220(Top 559%)
35K21.75 mi0.75 mi11250-4678515-1968515-19620485(Top 72%)12189(Top 76%)12189(Top 740%)
23M23.00 mi1.25 mi11404-1548540-258540-2513896(Top 49%)9111(Top 57%)9111(Top 553%)
24M24.00 mi1.00 mi11694-2908647-1078647-10717076(Top 60%)10484(Top 65%)10484(Top 636%)
40K24.85 mi0.85 mi12048-3548782-1358782-13518953(Top 67%)11284(Top 70%)11284(Top 685%)
25.2M25.20 mi0.35 mi12074-268780+28780+214075(Top 50%)8960(Top 56%)8960(Top 544%)
Finish26.22 mi1.02 mi12025+498736+448736+4411197(Top 39%)7615(Top 47%)7615(Top 462%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 33%
×21stories
+97ft-345ft

Overall

9480

Males

7814

M55-59

7814

5K→10K

3.1 - 6.2 mi

Top 31%
×5stories
+79ft-138ft

Overall

8870

Males

7526

M55-59

7526

10K→15K

6.2 - 9.3 mi

Top 33%
×3stories
+67ft-78ft

Overall

9480

Males

7814

M55-59

7814

15K→20K

9.3 - 12.4 mi

Top 38%
×5stories
+106ft-86ft

Overall

10702

Males

8356

M55-59

8356

20K→Half

12.4 - 13.1 mi

Top 36%
×2stories
+19ft-37ft

Overall

10254

Males

8170

M55-59

8170

Half→25K

13.1 - 15.5 mi

Top 39%
×4stories
+66ft-88ft

Overall

10948

Males

8364

M55-59

8364

25K→30K

15.5 - 18.6 mi

Top 45%
×9stories
+181ft-148ft

Overall

12788

Males

9044

M55-59

9044

30K→20M

18.6 - 20.0 mi

Top 44%
×5stories
+64ft-50ft

Overall

12571

Males

8803

M55-59

8803

20M→21M

20.0 - 21.0 mi

Top 48%
×8stories
+106ft-24ft

Overall

13768

Males

9220

M55-59

9220

21M→35K

21.0 - 21.8 mi

Top 72%
×7stories
+17ft-86ft

Overall

20485

Males

12189

M55-59

12189

35K→23M

21.8 - 23.0 mi

Top 49%
×5stories
+23ft-63ft

Overall

13896

Males

9111

M55-59

9111

23M→24M

23.0 - 24.0 mi

Top 60%
×6stories
+12ft-82ft

Overall

17076

Males

10484

M55-59

10484

24M→40K

24.0 - 24.9 mi

Top 67%
×1story
+6ft-20ft

Overall

18953

Males

11284

M55-59

11284

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

14075

Males

8960

M55-59

8960

25.2M→Finish

25.2 - 26.2 mi

Top 39%
×2stories
+22ft-21ft

Overall

11197

Males

7615

M55-59

7615

Passing Analysis

Category:
Athletes Passed
1783*
Passed By
3433
Net Change
-1652
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10373
5K → 10K857*40+817#10373#9556
10K → 15K184143+41#9556#9515
15K → 20K117382-265#9515#9780
20K → Half2850-22#9780#9802
Half → 25K109252-143#9802#9945
25K → 30K109620-513#9945#10458
30K → 20M78240-162#10458#10620
20M → 21M60223-163#10620#10783
21M → 35K4471-467#10783#11250
35K → 23M66220-154#11250#11404
23M → 24M34324-290#11404#11694
24M → 40K16370-354#11694#12048
40K → 25.2M2854-26#12048#12074
25.2M → Finish9344+49#12074#12025
TOTALS1783*3433-1652

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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