Boston Marathon logo
BOSTON MARATHON 2025

Sangjun Yoon

Bib: 8045•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Top 15%
Gender (Male)
#0 / 16105
Top 25%
Masters (Masters Men)
#0 / 10463
Top 11%
Division (M40-44)
#0 / 2247
Top 29%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:45
Rank: #5265
Start → 5K
20:45 | 6:41/mi
10K· 6.21 mi
41:21
Rank: #4969 (+296)
5K → 10K
20:36 | 6:38/mi
15K· 9.32 mi
1:02:10
Rank: #4955 (+14)
10K → 15K
20:49 | 6:42/mi
20K· 12.43 mi
1:23:08
Rank: #4907 (+48)
15K → 20K
20:58 | 6:45/mi
Half· 13.11 mi
1:27:45
Rank: #4947 (-40)
20K → Half
4:37 | 6:46/mi
25K· 15.53 mi
1:44:07
Rank: #4819 (+128)
Half → 25K
16:22 | 6:45/mi
30K· 18.64 mi
2:05:45
Rank: #4707 (+112)
25K → 30K
21:38 | 6:58/mi
20M
2:15:27
Rank: #4721 (-14)
30K → 20M
9:42 | 7:08/mi
21M
2:22:56
Rank: #4655 (+66)
20M → 21M
7:29 | 7:29/mi
35K· 21.75 mi
2:28:06
Rank: #4639 (+16)
21M → 35K
5:10 | 6:54/mi
23M
2:36:59
Rank: #4587 (+52)
35K → 23M
8:53 | 7:06/mi
24M
2:43:52
Rank: #4532 (+55)
23M → 24M
6:53 | 6:53/mi
40K· 24.85 mi
2:49:54
Rank: #4505 (+27)
24M → 40K
6:02 | 7:03/mi
25.2M
2:52:30
Rank: #4480 (+25)
40K → 25.2M
2:36 | 7:32/mi
Finish· 26.22 mi
2:59:08
Rank: #4394 (+86)
25.2M → Finish
6:38 | 6:31/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:27:45
Pace6:42 /mi
2nd Half
Distance13.11 mi
Time1:31:23
Pace6:58 /mi
📊Positive Split: 4.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:28:5120:456:4120:45
6:41
-
10K
6.21 mi10:49:2741:216:3920:36
6:38
-0:03
15K
9.32 mi11:10:161:02:106:4020:49
6:42
+0:04
20K
12.43 mi11:31:141:23:086:4120:58
6:45
+0:03
Half
13.11 mi11:35:511:27:456:424:37
6:46
+0:01
25K
15.53 mi11:52:131:44:076:4216:22
6:45
-0:01
30K
18.64 mi12:13:512:05:456:4521:38
6:58
+0:13
20M
20.00 mi12:23:332:15:276:469:42
7:08
+0:10
21M
21.00 mi12:31:022:22:566:487:29
7:29
+0:21
35K
21.75 mi12:36:122:28:066:495:10
6:54
-0:35
23M
23.00 mi12:45:052:36:596:508:53
7:06
+0:12
24M
24.00 mi12:51:582:43:526:506:53
6:53
-0:13
40K
24.85 mi12:58:002:49:546:506:02
7:03
+0:10
25.2M
25.20 mi13:00:362:52:306:512:36
7:32
+0:29
Finish
26.22 mi13:07:142:59:086:506:38
6:31
-1:01

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

6:31 /mi

Average Pace

6:50 /mi

Slowest Pace

7:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:49:03

94% of race

Time at Steady Pace

10:05

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:50 /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 mi10:28:5120:456:4120:45
6:41
#5265
10K
6.21 mi10:49:2741:216:3920:36
6:38
#4969
15K
9.32 mi11:10:161:02:106:4020:49
6:42
#4955
20K
12.43 mi11:31:141:23:086:4120:58
6:45
#4907
Half
13.11 mi11:35:511:27:456:424:37
6:46
#4947
25K
15.53 mi11:52:131:44:076:4216:22
6:45
#4819
30K
18.64 mi12:13:512:05:456:4521:38
6:58
#4707
20M
20.00 mi12:23:332:15:276:469:42
7:08
#4721
21M
21.00 mi12:31:022:22:566:487:29
7:29
#4655
35K
21.75 mi12:36:122:28:066:495:10
6:54
#4639
23M
23.00 mi12:45:052:36:596:508:53
7:06
#4587
24M
24.00 mi12:51:582:43:526:506:53
6:53
#4532
40K
24.85 mi12:58:002:49:546:506:02
7:03
#4505
25.2M
25.20 mi13:00:362:52:306:512:36
7:32
#4480
Finish
26.22 mi13:07:142:59:086:506:38
6:31
#4394
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi5265490049005080(Top 18%)4715(Top 29%)4715(Top 210%)
10K6.21 mi3.10 mi4969+2964635+2654635+2654714(Top 17%)4414(Top 27%)4414(Top 196%)
15K9.32 mi3.11 mi4955+144621+144621+145080(Top 18%)4715(Top 29%)4715(Top 210%)
20K12.43 mi3.11 mi4907+484574+474574+474837(Top 17%)4476(Top 28%)4476(Top 199%)
Half13.11 mi0.68 mi4947-404607-334607-335828(Top 21%)5315(Top 33%)5315(Top 237%)
25K15.53 mi2.42 mi4819+1284482+1254482+1254501(Top 16%)4161(Top 26%)4161(Top 185%)
30K18.64 mi3.11 mi4707+1124368+1144368+1144480(Top 16%)4098(Top 25%)4098(Top 182%)
20M20.00 mi1.36 mi4721-144376-84376-84879(Top 17%)4394(Top 27%)4394(Top 196%)
21M21.00 mi1.00 mi4655+664313+634313+634543(Top 16%)4033(Top 25%)4033(Top 179%)
35K21.75 mi0.75 mi4639+164292+214292+214777(Top 17%)4220(Top 26%)4220(Top 188%)
23M23.00 mi1.25 mi4587+524230+624230+624306(Top 15%)3818(Top 24%)3818(Top 170%)
24M24.00 mi1.00 mi4532+554178+524178+523999(Top 14%)3538(Top 22%)3538(Top 157%)
40K24.85 mi0.85 mi4505+274141+374141+374222(Top 15%)3659(Top 23%)3659(Top 163%)
25.2M25.20 mi0.35 mi4480+254116+254116+253610(Top 13%)3154(Top 20%)3154(Top 140%)
Finish26.22 mi1.02 mi4394+864036+804036+802886(Top 10%)2581(Top 16%)2581(Top 115%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 18%
×21stories
+97ft-345ft

Overall

5080

Males

4715

M40-44

4715

5K→10K

3.1 - 6.2 mi

Top 17%
×5stories
+79ft-138ft

Overall

4714

Males

4414

M40-44

4414

10K→15K

6.2 - 9.3 mi

Top 18%
×3stories
+67ft-78ft

Overall

5080

Males

4715

M40-44

4715

15K→20K

9.3 - 12.4 mi

Top 17%
×5stories
+106ft-86ft

Overall

4837

Males

4476

M40-44

4476

20K→Half

12.4 - 13.1 mi

Top 21%
×2stories
+19ft-37ft

Overall

5828

Males

5315

M40-44

5315

Half→25K

13.1 - 15.5 mi

Top 16%
×4stories
+66ft-88ft

Overall

4501

Males

4161

M40-44

4161

25K→30K

15.5 - 18.6 mi

Top 16%
×9stories
+181ft-148ft

Overall

4480

Males

4098

M40-44

4098

30K→20M

18.6 - 20.0 mi

Top 17%
×5stories
+64ft-50ft

Overall

4879

Males

4394

M40-44

4394

20M→21M

20.0 - 21.0 mi

Top 16%
×8stories
+106ft-24ft

Overall

4543

Males

4033

M40-44

4033

21M→35K

21.0 - 21.8 mi

Top 17%
×7stories
+17ft-86ft

Overall

4777

Males

4220

M40-44

4220

35K→23M

21.8 - 23.0 mi

Top 15%
×5stories
+23ft-63ft

Overall

4306

Males

3818

M40-44

3818

23M→24M

23.0 - 24.0 mi

Top 14%
×6stories
+12ft-82ft

Overall

3999

Males

3538

M40-44

3538

24M→40K

24.0 - 24.9 mi

Top 15%
×1story
+6ft-20ft

Overall

4222

Males

3659

M40-44

3659

40K→25.2M

24.9 - 25.2 mi

Top 13%
×1story
+13ft-16ft

Overall

3610

Males

3154

M40-44

3154

25.2M→Finish

25.2 - 26.2 mi

Top 10%
×2stories
+22ft-21ft

Overall

2886

Males

2581

M40-44

2581

Passing Analysis

Category:
Athletes Passed
1655
Passed By
784
Net Change
+871
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5265
5K → 10K36973+296#5265#4969
10K → 15K124110+14#4969#4955
15K → 20K154106+48#4955#4907
20K → Half1151-40#4907#4947
Half → 25K16638+128#4947#4819
25K → 30K215103+112#4819#4707
30K → 20M6983-14#4707#4721
20M → 21M10640+66#4721#4655
21M → 35K5034+16#4655#4639
35K → 23M10048+52#4639#4587
23M → 24M9338+55#4587#4532
24M → 40K6134+27#4532#4505
40K → 25.2M3510+25#4505#4480
25.2M → Finish10216+86#4480#4394
TOTALS1655784+871
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing