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BOSTON MARATHON 2025

Sungsu Kim

Bib: 21221•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M60-64)
#0 / 1259
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:06/mi
25:09
↑ 97↓ 3451.5%
10K· 6.21 mi
7:56/mi
49:47
↑ 79↓ 1380.4%
15K· 9.32 mi
8:00/mi
1:14:39
↑ 67↓ 78
20K· 12.43 mi
8:36/mi
1:41:23
↑ 106↓ 860.1%
Half· 13.11 mi
8:59/mi
1:47:31
↑ 19↓ 370.5%
25K· 15.53 mi
9:07/mi
2:09:38
↑ 66↓ 880.2%
30K· 18.64 mi
9:29/mi
2:39:06
↑ 181↓ 1480.2%
20M
11:24/mi
2:54:35
↑ 64↓ 500.2%
21M
14:53/mi
3:09:28
↑ 106↓ 241.6%
35K· 21.75 mi
11:43/mi
3:18:14
↑ 17↓ 861.7%
23M
9:39/mi
3:30:19
↑ 23↓ 630.6%
24M
8:58/mi
3:39:17
↓ 821.3%
40K· 24.85 mi
11:49/mi
3:49:23
↓ 200.3%
25.2M
15:34/mi
3:54:45
↑ 13↓ 160.2%
Finish· 26.22 mi
10:15/mi
4:05:12
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:31
Pace8:12 /mi
2nd Half
Distance13.11 mi
Time2:17:41
Pace10:30 /mi
📊Positive Split: 28.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:5225:098:0625:09
8:06
-
10K
6.21 mi11:42:3049:478:0124:38
7:56
-0:10
15K
9.32 mi12:07:221:14:398:0124:52
8:00
+0:04
20K
12.43 mi12:34:061:41:238:0926:44
8:36
+0:36
Half
13.11 mi12:40:141:47:318:126:08
8:59
+0:23
25K
15.53 mi13:02:212:09:388:2122:07
9:07
+0:08
30K
18.64 mi13:31:492:39:068:3229:28
9:29
+0:22
20M
20.00 mi13:47:182:54:358:4415:29
11:24
+1:55
21M
21.00 mi14:02:113:09:289:0114:53
14:53
+3:29
35K
21.75 mi14:10:573:18:149:078:46
11:43
-3:10
23M
23.00 mi14:23:023:30:199:0912:05
9:39
-2:04
24M
24.00 mi14:32:003:39:179:088:58
8:58
-0:41
40K
24.85 mi14:42:063:49:239:1410:06
11:49
+2:51
25.2M
25.20 mi14:47:283:54:459:195:22
15:34
+3:45
Finish
26.22 mi14:57:554:05:129:2210:27
10:15
-5:19

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

7:56 /mi

Average Pace

9:22 /mi

Slowest Pace

15:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:14:39

30% of race

Time at Steady Pace

1:55:57

47% of race

Time at Slower Pace

54:36

22% of race

Average Pace: 9:21 /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 mi11:17:5225:098:0625:09
8:06
#17314
10K
6.21 mi11:42:3049:478:0124:38
7:56
#16608
15K
9.32 mi12:07:221:14:398:0124:52
8:00
#16406
20K
12.43 mi12:34:061:41:238:0926:44
8:36
#17091
Half
13.11 mi12:40:141:47:318:126:08
8:59
#17335
25K
15.53 mi13:02:212:09:388:2122:07
9:07
#17898
30K
18.64 mi13:31:492:39:068:3229:28
9:29
#18350
20M
20.00 mi13:47:182:54:358:4415:29
11:24
#19163
21M
21.00 mi14:02:113:09:289:0114:53
14:53
#20302
35K
21.75 mi14:10:573:18:149:078:46
11:43
#20634
23M
23.00 mi14:23:023:30:199:0912:05
9:39
#20565
24M
24.00 mi14:32:003:39:179:088:58
8:58
#20461
40K
24.85 mi14:42:063:49:239:1410:06
11:49
#20739
25.2M
25.20 mi14:47:283:54:459:195:22
15:34
#20953
Finish
26.22 mi14:57:554:05:129:2210:27
10:15
#21077
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM60-64Seg. OverallSeg. MalesSeg. M60-64
5K3.11 mi3.11 mi17314113411134116073(Top 57%)10846(Top 67%)10846(Top 861%)
10K6.21 mi3.10 mi16608+70611061+28011061+28015896(Top 56%)10789(Top 67%)10789(Top 857%)
15K9.32 mi3.11 mi16406+20210981+8010981+8016073(Top 57%)10846(Top 67%)10846(Top 861%)
20K12.43 mi3.11 mi17091-68511243-26211243-26218872(Top 66%)11985(Top 74%)11985(Top 952%)
Half13.11 mi0.68 mi17335-24411341-9811341-9821748(Top 77%)13236(Top 82%)13236(Top 1051%)
25K15.53 mi2.42 mi17898-56311554-21311554-21320442(Top 72%)12610(Top 78%)12610(Top 1002%)
30K18.64 mi3.11 mi18350-45211719-16511719-16519878(Top 70%)12233(Top 76%)12233(Top 972%)
20M20.00 mi1.36 mi19163-81312039-32012039-32024349(Top 86%)14143(Top 88%)14143(Top 1123%)
21M21.00 mi1.00 mi20302-113912499-46012499-46027053(Top 95%)15392(Top 96%)15392(Top 1223%)
35K21.75 mi0.75 mi20634-33212640-14112640-14125426(Top 90%)14548(Top 90%)14548(Top 1156%)
23M23.00 mi1.25 mi20565+6912586+5412586+5419274(Top 68%)11572(Top 72%)11572(Top 919%)
24M24.00 mi1.00 mi20461+10412526+6012526+6017197(Top 61%)10568(Top 66%)10568(Top 839%)
40K24.85 mi0.85 mi20739-27812631-10512631-10524647(Top 87%)14084(Top 87%)14084(Top 1119%)
25.2M25.20 mi0.35 mi20953-21412713-8212713-8227491(Top 97%)15530(Top 96%)15530(Top 1234%)
Finish26.22 mi1.02 mi21077-12412755-4212755-4223662(Top 83%)13591(Top 84%)13591(Top 1080%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 57%
×21story building
+97ft-345ft

Overall

16073

Males

10846

M60-64

10846

5K→10K

3.1 - 6.2 mi

Top 56%
×5story building
+79ft-138ft

Overall

15896

Males

10789

M60-64

10789

10K→15K

6.2 - 9.3 mi

Top 57%
×3story building
+67ft-78ft

Overall

16073

Males

10846

M60-64

10846

15K→20K

9.3 - 12.4 mi

Top 66%
×5story building
+106ft-86ft

Overall

18872

Males

11985

M60-64

11985

20K→Half

12.4 - 13.1 mi

Top 77%
×2story building
+19ft-37ft

Overall

21748

Males

13236

M60-64

13236

Half→25K

13.1 - 15.5 mi

Top 72%
×4story building
+66ft-88ft

Overall

20442

Males

12610

M60-64

12610

25K→30K

15.5 - 18.6 mi

Top 70%
×9story building
+181ft-148ft

Overall

19878

Males

12233

M60-64

12233

30K→20M

18.6 - 20.0 mi

Top 86%
×5story building
+64ft-50ft

Overall

24349

Males

14143

M60-64

14143

20M→21M

20.0 - 21.0 mi

Top 95%
×8story building
+106ft-24ft

Overall

27053

Males

15392

M60-64

15392

21M→35K

21.0 - 21.8 mi

Top 90%
×7story building
+17ft-86ft

Overall

25426

Males

14548

M60-64

14548

35K→23M

21.8 - 23.0 mi

Top 68%
×5story building
+23ft-63ft

Overall

19274

Males

11572

M60-64

11572

23M→24M

23.0 - 24.0 mi

Top 61%
×6story building
+12ft-82ft

Overall

17197

Males

10568

M60-64

10568

24M→40K

24.0 - 24.9 mi

Top 87%
×1story
+6ft-20ft

Overall

24647

Males

14084

M60-64

14084

40K→25.2M

24.9 - 25.2 mi

Top 97%
×1story
+13ft-16ft

Overall

27491

Males

15530

M60-64

15530

25.2M→Finish

25.2 - 26.2 mi

Top 83%
×2story building
+22ft-21ft

Overall

23662

Males

13591

M60-64

13591

Passing Analysis

Category:
Athletes Passed
1629
Passed By
5392
Net Change
-3763
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17314
5K → 10K79084+706#17314#16608
10K → 15K308106+202#16608#16406
15K → 20K52737-685#16406#17091
20K → Half4248-244#17091#17335
Half → 25K59622-563#17335#17898
25K → 30K121573-452#17898#18350
30K → 20M11824-813#18350#19163
20M → 21M51144-1139#19163#20302
21M → 35K12344-332#20302#20634
35K → 23M12051+69#20634#20565
23M → 24M1139+104#20565#20461
24M → 40K12290-278#20461#20739
40K → 25.2M6220-214#20739#20953
25.2M → Finish16140-124#20953#21077
TOTALS16295392-3763
📊

Passing Visuals

Category:
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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