Boston Marathon logo
BOSTON MARATHON 2025

Thomas O'Byrne

Bib: 5425•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Top 16%
Gender (Male)
#0 / 16105
Top 26%
Masters (Masters Men)
#0 / 10463
Top 12%
Division (M40-44)
#0 / 2247
Top 32%
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
6:32/mi
20:18
↑ 97↓ 3451.5%
10K· 6.21 mi
6:32/mi
40:35
↑ 79↓ 1380.4%
15K· 9.32 mi
6:35/mi
1:01:03
↑ 67↓ 78
20K· 12.43 mi
6:48/mi
1:22:10
↑ 106↓ 860.1%
Half· 13.11 mi
6:37/mi
1:26:41
↑ 19↓ 370.5%
25K· 15.53 mi
6:46/mi
1:43:06
↑ 66↓ 880.2%
30K· 18.64 mi
6:59/mi
2:04:48
↑ 181↓ 1480.2%
20M
7:13/mi
2:14:36
↑ 64↓ 500.2%
21M
7:40/mi
2:22:16
↑ 106↓ 241.6%
35K· 21.75 mi
6:40/mi
2:27:15
↑ 17↓ 861.7%
23M
7:12/mi
2:36:16
↑ 23↓ 630.6%
24M
6:47/mi
2:43:03
↓ 821.3%
40K· 24.85 mi
7:13/mi
2:49:13
↓ 200.3%
25.2M
8:19/mi
2:52:05
↑ 13↓ 160.2%
Finish· 26.22 mi
7:26/mi
2:59:39
↑ 22↓ 21

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
Time1:26:41
Pace6:37 /mi
2nd Half
Distance13.11 mi
Time1:32:58
Pace7:06 /mi
📊Positive Split: 7.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:25:0320:186:3220:18
6:32
-
10K
6.21 mi10:45:2040:356:3220:17
6:32
0:00
15K
9.32 mi11:05:481:01:036:3320:28
6:35
+0:03
20K
12.43 mi11:26:551:22:106:3721:07
6:48
+0:13
Half
13.11 mi11:31:261:26:416:374:31
6:37
-0:11
25K
15.53 mi11:47:511:43:066:3816:25
6:46
+0:09
30K
18.64 mi12:09:332:04:486:4221:42
6:59
+0:13
20M
20.00 mi12:19:212:14:366:449:48
7:13
+0:14
21M
21.00 mi12:27:012:22:166:467:40
7:40
+0:27
35K
21.75 mi12:32:002:27:156:464:59
6:40
-1:00
23M
23.00 mi12:41:012:36:166:489:01
7:12
+0:32
24M
24.00 mi12:47:482:43:036:486:47
6:47
-0:25
40K
24.85 mi12:53:582:49:136:486:10
7:13
+0:26
25.2M
25.20 mi12:56:502:52:056:502:52
8:19
+1:06
Finish
26.22 mi13:04:242:59:396:517:34
7:26
-0:53

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

6:32 /mi

Average Pace

6:51 /mi

Slowest Pace

8:19 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

40:35

23% of race

Time at Steady Pace

1:35:59

53% of race

Time at Slower Pace

43:05

24% of race

Average Pace: 6:51 /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 mi10:25:0320:186:3220:18
6:32
#4096
10K
6.21 mi10:45:2040:356:3220:17
6:32
#3999
15K
9.32 mi11:05:481:01:036:3320:28
6:35
#4032
20K
12.43 mi11:26:551:22:106:3721:07
6:48
#4278
Half
13.11 mi11:31:261:26:416:374:31
6:37
#4268
25K
15.53 mi11:47:511:43:066:3816:25
6:46
#4271
30K
18.64 mi12:09:332:04:486:4221:42
6:59
#4281
20M
20.00 mi12:19:212:14:366:449:48
7:13
#4346
21M
21.00 mi12:27:012:22:166:467:40
7:40
#4409
35K
21.75 mi12:32:002:27:156:464:59
6:40
#4328
23M
23.00 mi12:41:012:36:166:489:01
7:12
#4348
24M
24.00 mi12:47:482:43:036:486:47
6:47
#4258
40K
24.85 mi12:53:582:49:136:486:10
7:13
#4296
25.2M
25.20 mi12:56:502:52:056:502:52
8:19
#4342
Finish
26.22 mi13:04:242:59:396:517:34
7:26
#4581
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi4096386338634141(Top 15%)3896(Top 24%)3896(Top 173%)
10K6.21 mi3.10 mi3999+973780+833780+833943(Top 14%)3714(Top 23%)3714(Top 165%)
15K9.32 mi3.11 mi4032-333801-213801-214141(Top 15%)3896(Top 24%)3896(Top 173%)
20K12.43 mi3.11 mi4278-2464023-2224023-2225269(Top 19%)4844(Top 30%)4844(Top 216%)
Half13.11 mi0.68 mi4268+104012+114012+114631(Top 16%)4324(Top 27%)4324(Top 192%)
25K15.53 mi2.42 mi4271-34006+64006+64658(Top 16%)4295(Top 27%)4295(Top 191%)
30K18.64 mi3.11 mi4281-10400640064612(Top 16%)4209(Top 26%)4209(Top 187%)
20M20.00 mi1.36 mi4346-654056-504056-505261(Top 19%)4678(Top 29%)4678(Top 208%)
21M21.00 mi1.00 mi4409-634095-394095-395470(Top 19%)4716(Top 29%)4716(Top 210%)
35K21.75 mi0.75 mi4328+814018+774018+773323(Top 12%)3039(Top 19%)3039(Top 135%)
23M23.00 mi1.25 mi4348-204027-94027-94887(Top 17%)4238(Top 26%)4238(Top 189%)
24M24.00 mi1.00 mi4258+903938+893938+893434(Top 12%)3089(Top 19%)3089(Top 137%)
40K24.85 mi0.85 mi4296-383963-253963-255119(Top 18%)4290(Top 27%)4290(Top 191%)
25.2M25.20 mi0.35 mi4342-464001-384001-387650(Top 27%)5709(Top 35%)5709(Top 254%)
Finish26.22 mi1.02 mi4581-2394200-1994200-1998650(Top 30%)6256(Top 39%)6256(Top 278%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 15%
×21story building
+97ft-345ft

Overall

4141

Males

3896

M40-44

3896

5K→10K

3.1 - 6.2 mi

Top 14%
×5story building
+79ft-138ft

Overall

3943

Males

3714

M40-44

3714

10K→15K

6.2 - 9.3 mi

Top 15%
×3story building
+67ft-78ft

Overall

4141

Males

3896

M40-44

3896

15K→20K

9.3 - 12.4 mi

Top 19%
×5story building
+106ft-86ft

Overall

5269

Males

4844

M40-44

4844

20K→Half

12.4 - 13.1 mi

Top 16%
×2story building
+19ft-37ft

Overall

4631

Males

4324

M40-44

4324

Half→25K

13.1 - 15.5 mi

Top 16%
×4story building
+66ft-88ft

Overall

4658

Males

4295

M40-44

4295

25K→30K

15.5 - 18.6 mi

Top 16%
×9story building
+181ft-148ft

Overall

4612

Males

4209

M40-44

4209

30K→20M

18.6 - 20.0 mi

Top 19%
×5story building
+64ft-50ft

Overall

5261

Males

4678

M40-44

4678

20M→21M

20.0 - 21.0 mi

Top 19%
×8story building
+106ft-24ft

Overall

5470

Males

4716

M40-44

4716

21M→35K

21.0 - 21.8 mi

Top 12%
×7story building
+17ft-86ft

Overall

3323

Males

3039

M40-44

3039

35K→23M

21.8 - 23.0 mi

Top 17%
×5story building
+23ft-63ft

Overall

4887

Males

4238

M40-44

4238

23M→24M

23.0 - 24.0 mi

Top 12%
×6story building
+12ft-82ft

Overall

3434

Males

3089

M40-44

3089

24M→40K

24.0 - 24.9 mi

Top 18%
×1story
+6ft-20ft

Overall

5119

Males

4290

M40-44

4290

40K→25.2M

24.9 - 25.2 mi

Top 27%
×1story
+13ft-16ft

Overall

7650

Males

5709

M40-44

5709

25.2M→Finish

25.2 - 26.2 mi

Top 30%
×2story building
+22ft-21ft

Overall

8650

Males

6256

M40-44

6256

Passing Analysis

Category:
Athletes Passed
986
Passed By
1471
Net Change
-485
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4096
5K → 10K210113+97#4096#3999
10K → 15K75108-33#3999#4032
15K → 20K37283-246#4032#4278
20K → Half2818+10#4278#4268
Half → 25K8992-3#4268#4271
25K → 30K141151-10#4271#4281
30K → 20M51116-65#4281#4346
20M → 21M49112-63#4346#4409
21M → 35K898+81#4409#4328
35K → 23M6282-20#4328#4348
23M → 24M10313+90#4348#4258
24M → 40K3371-38#4258#4296
40K → 25.2M1157-46#4296#4342
25.2M → Finish8247-239#4342#4581
TOTALS9861471-485
📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing