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BOSTON MARATHON 2025

Alston Mccaslin

Bib: 1890•M

MD

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
26:55
Rank: #20817
Start → 5K
26:55 | 8:40/mi
10K· 6.21 mi
53:38
Rank: #20560 (+257)
5K → 10K
26:43 | 8:36/mi
15K· 9.32 mi
1:20:36
Rank: #20464 (+96)
10K → 15K
26:58 | 8:41/mi
20K· 12.43 mi
1:48:03
Rank: #20383 (+81)
15K → 20K
27:27 | 8:50/mi
Half· 13.11 mi
1:54:04
Rank: #20416 (-33)
20K → Half
6:01 | 8:49/mi
25K· 15.53 mi
2:17:11
Rank: #20766 (-350)
Half → 25K
23:07 | 9:32/mi
30K· 18.64 mi
2:46:08
Rank: #20426 (+340)
25K → 30K
28:57 | 9:19/mi
20M
2:58:55
Rank: #20304 (+122)
30K → 20M
12:47 | 9:24/mi
21M
3:08:56
Rank: #20184 (+120)
20M → 21M
10:01 | 10:01/mi
35K· 21.75 mi
3:15:45
Rank: #20129 (+55)
21M → 35K
6:49 | 9:07/mi
23M
3:27:40
Rank: #20060 (+69)
35K → 23M
11:55 | 9:31/mi
24M
3:37:09
Rank: #20042 (+18)
23M → 24M
9:29 | 9:29/mi
40K· 24.85 mi
3:45:33
Rank: #20032 (+10)
24M → 40K
8:24 | 9:49/mi
25.2M
3:49:04
Rank: #20000 (+32)
40K → 25.2M
3:31 | 10:12/mi
Finish· 26.22 mi
3:58:10
Rank: #19970 (+30)
25.2M → Finish
9:06 | 8:56/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:04
Pace8:42 /mi
2nd Half
Distance13.11 mi
Time2:04:06
Pace9:28 /mi
📊Positive Split: 8.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:23:1326:558:4026:55
8:40
-
10K
6.21 mi11:49:5653:388:3826:43
8:36
-0:04
15K
9.32 mi12:16:541:20:368:3926:58
8:41
+0:05
20K
12.43 mi12:44:211:48:038:4227:27
8:50
+0:09
Half
13.11 mi12:50:221:54:048:426:01
8:49
-0:01
25K
15.53 mi13:13:292:17:118:5023:07
9:32
+0:43
30K
18.64 mi13:42:262:46:088:5528:57
9:19
-0:13
20M
20.00 mi13:55:132:58:558:5712:47
9:24
+0:05
21M
21.00 mi14:05:143:08:569:0010:01
10:01
+0:37
35K
21.75 mi14:12:033:15:459:006:49
9:07
-0:54
23M
23.00 mi14:23:583:27:409:0211:55
9:31
+0:24
24M
24.00 mi14:33:273:37:099:039:29
9:29
-0:02
40K
24.85 mi14:41:513:45:339:048:24
9:49
+0:20
25.2M
25.20 mi14:45:223:49:049:053:31
10:12
+0:23
Finish
26.22 mi14:54:283:58:109:059:06
8:56
-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

8:36 /mi

Average Pace

9:05 /mi

Slowest Pace

10:12 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:51:43

72% of race

Time at Steady Pace

1:02:56

26% of race

Time at Slower Pace

3:31

1% of race

Average Pace: 9:05 /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 mi11:23:1326:558:4026:55
8:40
#20817
10K
6.21 mi11:49:5653:388:3826:43
8:36
#20560
15K
9.32 mi12:16:541:20:368:3926:58
8:41
#20464
20K
12.43 mi12:44:211:48:038:4227:27
8:50
#20383
Half
13.11 mi12:50:221:54:048:426:01
8:49
#20416
25K
15.53 mi13:13:292:17:118:5023:07
9:32
#20766
30K
18.64 mi13:42:262:46:088:5528:57
9:19
#20426
20M
20.00 mi13:55:132:58:558:5712:47
9:24
#20304
21M
21.00 mi14:05:143:08:569:0010:01
10:01
#20184
35K
21.75 mi14:12:033:15:459:006:49
9:07
#20129
23M
23.00 mi14:23:583:27:409:0211:55
9:31
#20060
24M
24.00 mi14:33:273:37:099:039:29
9:29
#20042
40K
24.85 mi14:41:513:45:339:048:24
9:49
#20032
25.2M
25.20 mi14:45:223:49:049:053:31
10:12
#20000
Finish
26.22 mi14:54:283:58:109:059:06
8:56
#19970
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi20817127771277720358(Top 72%)12673(Top 79%)12673(Top 225%)
10K6.21 mi3.10 mi20560+25712698+7912698+7920343(Top 72%)12627(Top 78%)12627(Top 224%)
15K9.32 mi3.11 mi20464+9612674+2412674+2420358(Top 72%)12673(Top 79%)12673(Top 225%)
20K12.43 mi3.11 mi20383+8112634+4012634+4020126(Top 71%)12518(Top 78%)12518(Top 222%)
Half13.11 mi0.68 mi20416-3312645-1112645-1120958(Top 74%)12871(Top 80%)12871(Top 228%)
25K15.53 mi2.42 mi20766-35012797-15212797-15221965(Top 77%)13273(Top 82%)13273(Top 235%)
30K18.64 mi3.11 mi20426+34012592+20512592+20519193(Top 68%)11922(Top 74%)11922(Top 211%)
20M20.00 mi1.36 mi20304+12212521+7112521+7118770(Top 66%)11577(Top 72%)11577(Top 205%)
21M21.00 mi1.00 mi20184+12012444+7712444+7718357(Top 65%)11332(Top 70%)11332(Top 201%)
35K21.75 mi0.75 mi20129+5512412+3212412+3218758(Top 66%)11384(Top 71%)11384(Top 202%)
23M23.00 mi1.25 mi20060+6912350+6212350+6218772(Top 66%)11342(Top 70%)11342(Top 201%)
24M24.00 mi1.00 mi20042+1812323+2712323+2719571(Top 69%)11656(Top 72%)11656(Top 207%)
40K24.85 mi0.85 mi20032+1012300+2312300+2319881(Top 70%)11743(Top 73%)11743(Top 208%)
25.2M25.20 mi0.35 mi20000+3212282+1812282+1817861(Top 63%)10763(Top 67%)10763(Top 191%)
Finish26.22 mi1.02 mi19970+3012252+3012252+3018666(Top 66%)11210(Top 70%)11210(Top 199%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 72%
×21stories
+97ft-345ft

Overall

20358

Males

12673

M18-39

12673

5K→10K

3.1 - 6.2 mi

Top 72%
×5stories
+79ft-138ft

Overall

20343

Males

12627

M18-39

12627

10K→15K

6.2 - 9.3 mi

Top 72%
×3stories
+67ft-78ft

Overall

20358

Males

12673

M18-39

12673

15K→20K

9.3 - 12.4 mi

Top 71%
×5stories
+106ft-86ft

Overall

20126

Males

12518

M18-39

12518

20K→Half

12.4 - 13.1 mi

Top 74%
×2stories
+19ft-37ft

Overall

20958

Males

12871

M18-39

12871

Half→25K

13.1 - 15.5 mi

Top 77%
×4stories
+66ft-88ft

Overall

21965

Males

13273

M18-39

13273

25K→30K

15.5 - 18.6 mi

Top 68%
×9stories
+181ft-148ft

Overall

19193

Males

11922

M18-39

11922

30K→20M

18.6 - 20.0 mi

Top 66%
×5stories
+64ft-50ft

Overall

18770

Males

11577

M18-39

11577

20M→21M

20.0 - 21.0 mi

Top 65%
×8stories
+106ft-24ft

Overall

18357

Males

11332

M18-39

11332

21M→35K

21.0 - 21.8 mi

Top 66%
×7stories
+17ft-86ft

Overall

18758

Males

11384

M18-39

11384

35K→23M

21.8 - 23.0 mi

Top 66%
×5stories
+23ft-63ft

Overall

18772

Males

11342

M18-39

11342

23M→24M

23.0 - 24.0 mi

Top 69%
×6stories
+12ft-82ft

Overall

19571

Males

11656

M18-39

11656

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

19881

Males

11743

M18-39

11743

40K→25.2M

24.9 - 25.2 mi

Top 63%
×1story
+13ft-16ft

Overall

17861

Males

10763

M18-39

10763

25.2M→Finish

25.2 - 26.2 mi

Top 66%
×2stories
+22ft-21ft

Overall

18666

Males

11210

M18-39

11210

Passing Analysis

Category:
Athletes Passed
2147
Passed By
1300
Net Change
+847
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20817
5K → 10K435178+257#20817#20560
10K → 15K243147+96#20560#20464
15K → 20K218137+81#20464#20383
20K → Half2053-33#20383#20416
Half → 25K65415-350#20416#20766
25K → 30K40060+340#20766#20426
30K → 20M15735+122#20426#20304
20M → 21M15636+120#20304#20184
21M → 35K7823+55#20184#20129
35K → 23M11546+69#20129#20060
23M → 24M7355+18#20060#20042
24M → 40K6050+10#20042#20032
40K → 25.2M4412+32#20032#20000
25.2M → Finish8353+30#20000#19970
TOTALS21471300+847
📊

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