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BOSTON MARATHON 2025

Duncan Byrne

Bib: 31268•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M50-54)
#0 / 1996
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
8:18/mi
25:47
↑ 97↓ 3451.5%
10K· 6.21 mi
8:09/mi
51:06
↑ 79↓ 1380.4%
15K· 9.32 mi
8:22/mi
1:17:05
↑ 67↓ 78
20K· 12.43 mi
8:22/mi
1:43:04
↑ 106↓ 860.1%
Half· 13.11 mi
8:04/mi
1:48:34
↑ 19↓ 370.5%
25K· 15.53 mi
8:29/mi
2:09:09
↑ 66↓ 880.2%
30K· 18.64 mi
9:04/mi
2:37:18
↑ 181↓ 1480.2%
20M
8:58/mi
2:49:29
↑ 64↓ 500.2%
21M
10:15/mi
2:59:44
↑ 106↓ 241.6%
35K· 21.75 mi
8:49/mi
3:06:20
↑ 17↓ 861.7%
23M
9:31/mi
3:18:15
↑ 23↓ 630.6%
24M
9:13/mi
3:27:28
↓ 821.3%
40K· 24.85 mi
9:18/mi
3:35:25
↓ 200.3%
25.2M
10:32/mi
3:39:03
↑ 13↓ 160.2%
Finish· 26.22 mi
9:08/mi
3:48:21
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:48:34
Pace8:17 /mi
2nd Half
Distance13.11 mi
Time1:59:47
Pace9:08 /mi
📊Positive Split: 10.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:47:4325:478:1825:47
8:18
-
10K
6.21 mi12:13:0251:068:1325:19
8:09
-0:09
15K
9.32 mi12:39:011:17:058:1625:59
8:22
+0:13
20K
12.43 mi13:05:001:43:048:1825:59
8:22
0:00
Half
13.11 mi13:10:301:48:348:175:30
8:04
-0:18
25K
15.53 mi13:31:052:09:098:1920:35
8:29
+0:25
30K
18.64 mi13:59:142:37:188:2628:09
9:04
+0:35
20M
20.00 mi14:11:252:49:298:2812:11
8:58
-0:06
21M
21.00 mi14:21:402:59:448:3410:15
10:15
+1:17
35K
21.75 mi14:28:163:06:208:346:36
8:49
-1:26
23M
23.00 mi14:40:113:18:158:3711:55
9:31
+0:42
24M
24.00 mi14:49:243:27:288:399:13
9:13
-0:18
40K
24.85 mi14:57:213:35:258:407:57
9:18
+0:05
25.2M
25.20 mi15:00:593:39:038:423:38
10:32
+1:14
Finish
26.22 mi15:10:173:48:218:439:18
9:08
-1:24

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

8:04 /mi

Average Pace

8:43 /mi

Slowest Pace

10:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:09:09

57% of race

Time at Steady Pace

1:13:24

32% of race

Time at Slower Pace

25:48

11% of race

Average Pace: 8:43 /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 mi11:47:4325:478:1825:47
8:18
#18700
10K
6.21 mi12:13:0251:068:1325:19
8:09
#18124
15K
9.32 mi12:39:011:17:058:1625:59
8:22
#18207
20K
12.43 mi13:05:001:43:048:1825:59
8:22
#17958
Half
13.11 mi13:10:301:48:348:175:30
8:04
#17866
25K
15.53 mi13:31:052:09:098:1920:35
8:29
#17663
30K
18.64 mi13:59:142:37:188:2628:09
9:04
#17721
20M
20.00 mi14:11:252:49:298:2812:11
8:58
#17603
21M
21.00 mi14:21:402:59:448:3410:15
10:15
#17748
35K
21.75 mi14:28:163:06:208:346:36
8:49
#17716
23M
23.00 mi14:40:113:18:158:3711:55
9:31
#17779
24M
24.00 mi14:49:243:27:288:399:13
9:13
#17795
40K
24.85 mi14:57:213:35:258:407:57
9:18
#17800
25.2M
25.20 mi15:00:593:39:038:423:38
10:32
#17843
Finish
26.22 mi15:10:173:48:218:439:18
9:08
#17923
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi18700119031190318459(Top 65%)11820(Top 73%)11820(Top 592%)
10K6.21 mi3.10 mi18124+57611667+23611667+23617529(Top 62%)11466(Top 71%)11466(Top 574%)
15K9.32 mi3.11 mi18207-8311704-3711704-3718459(Top 65%)11820(Top 73%)11820(Top 592%)
20K12.43 mi3.11 mi17958+24911591+11311591+11317309(Top 61%)11311(Top 70%)11311(Top 567%)
Half13.11 mi0.68 mi17866+9211549+4211549+4216349(Top 58%)10925(Top 68%)10925(Top 547%)
25K15.53 mi2.42 mi17663+20311457+9211457+9217121(Top 60%)11153(Top 69%)11153(Top 559%)
30K18.64 mi3.11 mi17721-5811430+2711430+2717969(Top 63%)11361(Top 71%)11361(Top 569%)
20M20.00 mi1.36 mi17603+11811348+8211348+8216601(Top 58%)10643(Top 66%)10643(Top 533%)
21M21.00 mi1.00 mi17748-14511401-5311401-5319180(Top 68%)11702(Top 73%)11702(Top 586%)
35K21.75 mi0.75 mi17716+3211372+2911372+2917345(Top 61%)10749(Top 67%)10749(Top 539%)
23M23.00 mi1.25 mi17779-6311353+1911353+1918763(Top 66%)11333(Top 70%)11333(Top 568%)
24M24.00 mi1.00 mi17795-1611324+2911324+2918407(Top 65%)11108(Top 69%)11108(Top 557%)
40K24.85 mi0.85 mi17800-511316+811316+817830(Top 63%)10735(Top 67%)10735(Top 538%)
25.2M25.20 mi0.35 mi17843-4311326-1011326-1019095(Top 67%)11353(Top 70%)11353(Top 569%)
Finish26.22 mi1.02 mi17923-8011349-2311349-2319603(Top 69%)11628(Top 72%)11628(Top 583%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 65%
×21story building
+97ft-345ft

Overall

18459

Males

11820

M50-54

11820

5K→10K

3.1 - 6.2 mi

Top 62%
×5story building
+79ft-138ft

Overall

17529

Males

11466

M50-54

11466

10K→15K

6.2 - 9.3 mi

Top 65%
×3story building
+67ft-78ft

Overall

18459

Males

11820

M50-54

11820

15K→20K

9.3 - 12.4 mi

Top 61%
×5story building
+106ft-86ft

Overall

17309

Males

11311

M50-54

11311

20K→Half

12.4 - 13.1 mi

Top 58%
×2story building
+19ft-37ft

Overall

16349

Males

10925

M50-54

10925

Half→25K

13.1 - 15.5 mi

Top 60%
×4story building
+66ft-88ft

Overall

17121

Males

11153

M50-54

11153

25K→30K

15.5 - 18.6 mi

Top 63%
×9story building
+181ft-148ft

Overall

17969

Males

11361

M50-54

11361

30K→20M

18.6 - 20.0 mi

Top 58%
×5story building
+64ft-50ft

Overall

16601

Males

10643

M50-54

10643

20M→21M

20.0 - 21.0 mi

Top 68%
×8story building
+106ft-24ft

Overall

19180

Males

11702

M50-54

11702

21M→35K

21.0 - 21.8 mi

Top 61%
×7story building
+17ft-86ft

Overall

17345

Males

10749

M50-54

10749

35K→23M

21.8 - 23.0 mi

Top 66%
×5story building
+23ft-63ft

Overall

18763

Males

11333

M50-54

11333

23M→24M

23.0 - 24.0 mi

Top 65%
×6story building
+12ft-82ft

Overall

18407

Males

11108

M50-54

11108

24M→40K

24.0 - 24.9 mi

Top 63%
×1story
+6ft-20ft

Overall

17830

Males

10735

M50-54

10735

40K→25.2M

24.9 - 25.2 mi

Top 67%
×1story
+13ft-16ft

Overall

19095

Males

11353

M50-54

11353

25.2M→Finish

25.2 - 26.2 mi

Top 69%
×2story building
+22ft-21ft

Overall

19603

Males

11628

M50-54

11628

Passing Analysis

Category:
Athletes Passed
2287
Passed By
1510
Net Change
+777
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18700
5K → 10K65781+576#18700#18124
10K → 15K156239-83#18124#18207
15K → 20K31869+249#18207#17958
20K → Half942+92#17958#17866
Half → 25K26259+203#17866#17663
25K → 30K204262-58#17663#17721
30K → 20M16850+118#17721#17603
20M → 21M61206-145#17603#17748
21M → 35K7745+32#17748#17716
35K → 23M93156-63#17716#17779
23M → 24M7591-16#17779#17795
24M → 40K5459-5#17795#17800
40K → 25.2M2164-43#17800#17843
25.2M → Finish47127-80#17843#17923
TOTALS22871510+777
📊

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