Boston Marathon logo
BOSTON MARATHON 2025

Sebastián Alonso Delgado

Bib: 1133•M

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 9%
Gender (Male)
#0 / 16105
Top 15%
Division (M18-39)
#0 / 5642
Top 36%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
17:30
Rank: #343
Start → 5K
17:30 | 5:38/mi
10K· 6.21 mi
35:17
Rank: #403 (-60)
5K → 10K
17:47 | 5:43/mi
15K· 9.32 mi
53:22
Rank: #459 (-56)
10K → 15K
18:05 | 5:49/mi
20K· 12.43 mi
1:12:32
Rank: #590 (-131)
15K → 20K
19:10 | 6:10/mi
Half· 13.11 mi
1:16:45
Rank: #626 (-36)
20K → Half
4:13 | 6:11/mi
25K· 15.53 mi
1:32:06
Rank: #769 (-143)
Half → 25K
15:21 | 6:20/mi
30K· 18.64 mi
1:52:52
Rank: #977 (-208)
25K → 30K
20:46 | 6:41/mi
20M
2:02:38
Rank: #1155 (-178)
30K → 20M
9:46 | 7:11/mi
21M
2:11:12
Rank: #1443 (-288)
20M → 21M
8:34 | 8:34/mi
35K· 21.75 mi
2:19:13
Rank: #2142 (-699)
21M → 35K
8:01 | 10:43/mi
23M
2:28:02
Rank: #2191 (-49)
35K → 23M
8:49 | 7:03/mi
24M
2:35:02
Rank: #2272 (-81)
23M → 24M
7:00 | 7:00/mi
40K· 24.85 mi
2:41:19
Rank: #2356 (-84)
24M → 40K
6:17 | 7:21/mi
25.2M
2:44:13
Rank: #2429 (-73)
40K → 25.2M
2:54 | 8:25/mi
Finish· 26.22 mi
2:51:59
Rank: #2633 (-204)
25.2M → Finish
7:46 | 7:37/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
Time1:16:45
Pace5:51 /mi
2nd Half
Distance13.11 mi
Time1:35:14
Pace7:16 /mi
📊Positive Split: 24.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:17:3317:305:3817:30
5:38
-
10K
6.21 mi10:35:2035:175:4117:47
5:43
+0:05
15K
9.32 mi10:53:2553:225:4418:05
5:49
+0:06
20K
12.43 mi11:12:351:12:325:5019:10
6:10
+0:21
Half
13.11 mi11:16:481:16:455:514:13
6:11
+0:01
25K
15.53 mi11:32:091:32:065:5615:21
6:20
+0:09
30K
18.64 mi11:52:551:52:526:0320:46
6:41
+0:21
20M
20.00 mi12:02:412:02:386:089:46
7:11
+0:30
21M
21.00 mi12:11:152:11:126:158:34
8:34
+1:23
35K
21.75 mi12:19:162:19:136:248:01
10:43
+2:09
23M
23.00 mi12:28:052:28:026:268:49
7:03
-3:40
24M
24.00 mi12:35:052:35:026:287:00
7:00
-0:03
40K
24.85 mi12:41:222:41:196:296:17
7:21
+0:21
25.2M
25.20 mi12:44:162:44:136:312:54
8:25
+1:04
Finish
26.22 mi12:52:022:51:596:347:46
7:37
-0:48

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

5:38 /mi

Average Pace

6:34 /mi

Slowest Pace

10:43 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:32:06

54% of race

Time at Steady Pace

1:00:24

35% of race

Time at Slower Pace

19:29

11% of race

Average Pace: 6:34 /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 mi10:17:3317:305:3817:30
5:38
#343
10K
6.21 mi10:35:2035:175:4117:47
5:43
#403
15K
9.32 mi10:53:2553:225:4418:05
5:49
#459
20K
12.43 mi11:12:351:12:325:5019:10
6:10
#590
Half
13.11 mi11:16:481:16:455:514:13
6:11
#626
25K
15.53 mi11:32:091:32:065:5615:21
6:20
#769
30K
18.64 mi11:52:551:52:526:0320:46
6:41
#977
20M
20.00 mi12:02:412:02:386:089:46
7:11
#1155
21M
21.00 mi12:11:152:11:126:158:34
8:34
#1443
35K
21.75 mi12:19:162:19:136:248:01
10:43
#2142
23M
23.00 mi12:28:052:28:026:268:49
7:03
#2191
24M
24.00 mi12:35:052:35:026:287:00
7:00
#2272
40K
24.85 mi12:41:222:41:196:296:17
7:21
#2356
25.2M
25.20 mi12:44:162:44:136:312:54
8:25
#2429
Finish
26.22 mi12:52:022:51:596:347:46
7:37
#2633
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi343311311564(Top 2%)526(Top 3%)526(Top 9%)
10K6.21 mi3.10 mi403-60370-59370-59497(Top 2%)460(Top 3%)460(Top 8%)
15K9.32 mi3.11 mi459-56423-53423-53564(Top 2%)526(Top 3%)526(Top 9%)
20K12.43 mi3.11 mi590-131546-123546-1231458(Top 5%)1383(Top 9%)1383(Top 25%)
Half13.11 mi0.68 mi626-36580-34580-341932(Top 7%)1845(Top 11%)1845(Top 33%)
25K15.53 mi2.42 mi769-143720-140720-1402038(Top 7%)1942(Top 12%)1942(Top 34%)
30K18.64 mi3.11 mi977-208920-200920-2002818(Top 10%)2666(Top 17%)2666(Top 47%)
20M20.00 mi1.36 mi1155-1781089-1691089-1695129(Top 18%)4578(Top 28%)4578(Top 81%)
21M21.00 mi1.00 mi1443-2881363-2741363-27410852(Top 38%)7791(Top 48%)7791(Top 138%)
35K21.75 mi0.75 mi2142-6992041-6782041-67823591(Top 83%)13675(Top 85%)13675(Top 242%)
23M23.00 mi1.25 mi2191-492085-442085-444014(Top 14%)3584(Top 22%)3584(Top 64%)
24M24.00 mi1.00 mi2272-812162-772162-774627(Top 16%)3998(Top 25%)3998(Top 71%)
40K24.85 mi0.85 mi2356-842240-782240-785903(Top 21%)4790(Top 30%)4790(Top 85%)
25.2M25.20 mi0.35 mi2429-732304-642304-648157(Top 29%)5981(Top 37%)5981(Top 106%)
Finish26.22 mi1.02 mi2633-2042492-1882492-18810066(Top 35%)7003(Top 43%)7003(Top 124%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 2%
×21stories
+97ft-345ft

Overall

564

Males

526

M18-39

526

5K→10K

3.1 - 6.2 mi

Top 2%
×5stories
+79ft-138ft

Overall

497

Males

460

M18-39

460

10K→15K

6.2 - 9.3 mi

Top 2%
×3stories
+67ft-78ft

Overall

564

Males

526

M18-39

526

15K→20K

9.3 - 12.4 mi

Top 5%
×5stories
+106ft-86ft

Overall

1458

Males

1383

M18-39

1383

20K→Half

12.4 - 13.1 mi

Top 7%
×2stories
+19ft-37ft

Overall

1932

Males

1845

M18-39

1845

Half→25K

13.1 - 15.5 mi

Top 7%
×4stories
+66ft-88ft

Overall

2038

Males

1942

M18-39

1942

25K→30K

15.5 - 18.6 mi

Top 10%
×9stories
+181ft-148ft

Overall

2818

Males

2666

M18-39

2666

30K→20M

18.6 - 20.0 mi

Top 18%
×5stories
+64ft-50ft

Overall

5129

Males

4578

M18-39

4578

20M→21M

20.0 - 21.0 mi

Top 38%
×8stories
+106ft-24ft

Overall

10852

Males

7791

M18-39

7791

21M→35K

21.0 - 21.8 mi

Top 83%
×7stories
+17ft-86ft

Overall

23591

Males

13675

M18-39

13675

35K→23M

21.8 - 23.0 mi

Top 14%
×5stories
+23ft-63ft

Overall

4014

Males

3584

M18-39

3584

23M→24M

23.0 - 24.0 mi

Top 16%
×6stories
+12ft-82ft

Overall

4627

Males

3998

M18-39

3998

24M→40K

24.0 - 24.9 mi

Top 21%
×1story
+6ft-20ft

Overall

5903

Males

4790

M18-39

4790

40K→25.2M

24.9 - 25.2 mi

Top 29%
×1story
+13ft-16ft

Overall

8157

Males

5981

M18-39

5981

25.2M→Finish

25.2 - 26.2 mi

Top 35%
×2stories
+22ft-21ft

Overall

10066

Males

7003

M18-39

7003

Passing Analysis

Category:
Athletes Passed
109
Passed By
2399
Net Change
-2290
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#343
5K → 10K666-60#343#403
10K → 15K864-56#403#459
15K → 20K1132-131#459#590
20K → Half036-36#590#626
Half → 25K9152-143#626#769
25K → 30K4212-208#769#977
30K → 20M5183-178#977#1155
20M → 21M2290-288#1155#1443
21M → 35K2701-699#1443#2142
35K → 23M2877-49#2142#2191
23M → 24M22103-81#2191#2272
24M → 40K16100-84#2272#2356
40K → 25.2M376-73#2356#2429
25.2M → Finish3207-204#2429#2633
TOTALS1092399-2290
📊

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