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BOSTON MARATHON 2025

Joshua Defronzo

Bib: 31370•M

RI

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
30:54
Rank: #25456
Start → 5K
30:54 | 9:57/mi
10K· 6.21 mi
1:02:33
Rank: #25579 (-123)
5K → 10K
31:39 | 10:11/mi
15K· 9.32 mi
1:33:31
Rank: #25367 (+212)
10K → 15K
30:58 | 9:58/mi
20K· 12.43 mi
2:05:27
Rank: #25226 (+141)
15K → 20K
31:56 | 10:17/mi
Half· 13.11 mi
2:11:55
Rank: #25147 (+79)
20K → Half
6:28 | 9:29/mi
25K· 15.53 mi
2:36:08
Rank: #24823 (+324)
Half → 25K
24:13 | 9:59/mi
30K· 18.64 mi
3:08:15
Rank: #24442 (+381)
25K → 30K
32:07 | 10:20/mi
20M
3:21:38
Rank: #24200 (+242)
30K → 20M
13:23 | 9:51/mi
21M
3:31:41
Rank: #23936 (+264)
20M → 21M
10:03 | 10:03/mi
35K· 21.75 mi
3:38:43
Rank: #23797 (+139)
21M → 35K
7:02 | 9:24/mi
23M
3:50:46
Rank: #23555 (+242)
35K → 23M
12:03 | 9:37/mi
24M
4:00:35
Rank: #23441 (+114)
23M → 24M
9:49 | 9:49/mi
40K· 24.85 mi
4:08:32
Rank: #23261 (+180)
24M → 40K
7:57 | 9:18/mi
25.2M
4:11:54
Rank: #23167 (+94)
40K → 25.2M
3:22 | 9:46/mi
Finish· 26.22 mi
4:20:34
Rank: #23014 (+153)
25.2M → Finish
8:40 | 8:30/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time2:11:55
Pace10:04 /mi
2nd Half✓ Faster
Distance13.11 mi
Time2:08:39
Pace9:49 /mi
📊Negative Split: 2.5% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:56:2330:549:5730:54
9:57
-
10K
6.21 mi12:28:021:02:3310:0431:39
10:11
+0:14
15K
9.32 mi12:59:001:33:3110:0230:58
9:58
-0:13
20K
12.43 mi13:30:562:05:2710:0631:56
10:17
+0:19
Half
13.11 mi13:37:242:11:5510:046:28
9:29
-0:48
25K
15.53 mi14:01:372:36:0810:0324:13
9:59
+0:30
30K
18.64 mi14:33:443:08:1510:0632:07
10:20
+0:21
20M
20.00 mi14:47:073:21:3810:0513:23
9:51
-0:29
21M
21.00 mi14:57:103:31:4110:0510:03
10:03
+0:12
35K
21.75 mi15:04:123:38:4310:037:02
9:24
-0:39
23M
23.00 mi15:16:153:50:4610:0212:03
9:37
+0:13
24M
24.00 mi15:26:044:00:3510:019:49
9:49
+0:12
40K
24.85 mi15:34:014:08:3210:007:57
9:18
-0:31
25.2M
25.20 mi15:37:234:11:5410:003:22
9:46
+0:28
Finish
26.22 mi15:46:034:20:349:578:40
8:30
-1:16

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

8:30 /mi

Average Pace

9:57 /mi

Slowest Pace

10:20 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

42:10

16% of race

Time at Steady Pace

2:02:42

47% of race

Time at Slower Pace

1:35:42

37% of race

Average Pace: 9:56 /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 mi11:56:2330:549:5730:54
9:57
#25456
10K
6.21 mi12:28:021:02:3310:0431:39
10:11
#25579
15K
9.32 mi12:59:001:33:3110:0230:58
9:58
#25367
20K
12.43 mi13:30:562:05:2710:0631:56
10:17
#25226
Half
13.11 mi13:37:242:11:5510:046:28
9:29
#25147
25K
15.53 mi14:01:372:36:0810:0324:13
9:59
#24823
30K
18.64 mi14:33:443:08:1510:0632:07
10:20
#24442
20M
20.00 mi14:47:073:21:3810:0513:23
9:51
#24200
21M
21.00 mi14:57:103:31:4110:0510:03
10:03
#23936
35K
21.75 mi15:04:123:38:4310:037:02
9:24
#23797
23M
23.00 mi15:16:153:50:4610:0212:03
9:37
#23555
24M
24.00 mi15:26:044:00:3510:019:49
9:49
#23441
40K
24.85 mi15:34:014:08:3210:007:57
9:18
#23261
25.2M
25.20 mi15:37:234:11:5410:003:22
9:46
#23167
Finish
26.22 mi15:46:034:20:349:578:40
8:30
#23014
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi25456149381493824923(Top 88%)14686(Top 91%)14686(Top 260%)
10K6.21 mi3.10 mi25579-12314971-3314971-3325721(Top 91%)15012(Top 93%)15012(Top 266%)
15K9.32 mi3.11 mi25367+21214878+9314878+9324923(Top 88%)14686(Top 91%)14686(Top 260%)
20K12.43 mi3.11 mi25226+14114802+7614802+7624788(Top 87%)14578(Top 91%)14578(Top 258%)
Half13.11 mi0.68 mi25147+7914764+3814764+3823488(Top 83%)13997(Top 87%)13997(Top 248%)
25K15.53 mi2.42 mi24823+32414599+16514599+16523224(Top 82%)13846(Top 86%)13846(Top 245%)
30K18.64 mi3.11 mi24442+38114412+18714412+18722559(Top 79%)13419(Top 83%)13419(Top 238%)
20M20.00 mi1.36 mi24200+24214277+13514277+13520443(Top 72%)12346(Top 77%)12346(Top 219%)
21M21.00 mi1.00 mi23936+26414147+13014147+13018494(Top 65%)11398(Top 71%)11398(Top 202%)
35K21.75 mi0.75 mi23797+13914070+7714070+7719949(Top 70%)11954(Top 74%)11954(Top 212%)
23M23.00 mi1.25 mi23555+24213940+13013940+13019176(Top 68%)11532(Top 72%)11532(Top 204%)
24M24.00 mi1.00 mi23441+11413873+6713873+6720777(Top 73%)12237(Top 76%)12237(Top 217%)
40K24.85 mi0.85 mi23261+18013761+11213761+11217850(Top 63%)10755(Top 67%)10755(Top 191%)
25.2M25.20 mi0.35 mi23167+9413706+5513706+5515916(Top 56%)9853(Top 61%)9853(Top 175%)
Finish26.22 mi1.02 mi23014+15313627+7913627+7916245(Top 57%)10053(Top 62%)10053(Top 178%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 88%
×21stories
+97ft-345ft

Overall

24923

Males

14686

M18-39

14686

5K→10K

3.1 - 6.2 mi

Top 91%
×5stories
+79ft-138ft

Overall

25721

Males

15012

M18-39

15012

10K→15K

6.2 - 9.3 mi

Top 88%
×3stories
+67ft-78ft

Overall

24923

Males

14686

M18-39

14686

15K→20K

9.3 - 12.4 mi

Top 87%
×5stories
+106ft-86ft

Overall

24788

Males

14578

M18-39

14578

20K→Half

12.4 - 13.1 mi

Top 83%
×2stories
+19ft-37ft

Overall

23488

Males

13997

M18-39

13997

Half→25K

13.1 - 15.5 mi

Top 82%
×4stories
+66ft-88ft

Overall

23224

Males

13846

M18-39

13846

25K→30K

15.5 - 18.6 mi

Top 79%
×9stories
+181ft-148ft

Overall

22559

Males

13419

M18-39

13419

30K→20M

18.6 - 20.0 mi

Top 72%
×5stories
+64ft-50ft

Overall

20443

Males

12346

M18-39

12346

20M→21M

20.0 - 21.0 mi

Top 65%
×8stories
+106ft-24ft

Overall

18494

Males

11398

M18-39

11398

21M→35K

21.0 - 21.8 mi

Top 70%
×7stories
+17ft-86ft

Overall

19949

Males

11954

M18-39

11954

35K→23M

21.8 - 23.0 mi

Top 68%
×5stories
+23ft-63ft

Overall

19176

Males

11532

M18-39

11532

23M→24M

23.0 - 24.0 mi

Top 73%
×6stories
+12ft-82ft

Overall

20777

Males

12237

M18-39

12237

24M→40K

24.0 - 24.9 mi

Top 63%
×1story
+6ft-20ft

Overall

17850

Males

10755

M18-39

10755

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

15916

Males

9853

M18-39

9853

25.2M→Finish

25.2 - 26.2 mi

Top 57%
×2stories
+22ft-21ft

Overall

16245

Males

10053

M18-39

10053

Passing Analysis

Category:
Athletes Passed
2838
Passed By
396
Net Change
+2442
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#25456
5K → 10K151274-123#25456#25579
10K → 15K25543+212#25579#25367
15K → 20K20059+141#25367#25226
20K → Half790+79#25226#25147
Half → 25K3262+324#25147#24823
25K → 30K3887+381#24823#24442
30K → 20M2431+242#24442#24200
20M → 21M2651+264#24200#23936
21M → 35K1412+139#23936#23797
35K → 23M2453+242#23797#23555
23M → 24M1184+114#23555#23441
24M → 40K1800+180#23441#23261
40K → 25.2M940+94#23261#23167
25.2M → Finish1530+153#23167#23014
TOTALS2838396+2442
📊

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