Boston Marathon logo
BOSTON MARATHON 2023

Sam Cathro

Bib: 2543•M

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 32%
Gender (Male)
#0 / 15176
Top 46%
Division (M18-39)
#0 / 5285
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:28
Rank: #2792
Start → 5K
20:28 | 6:35/mi
10K· 6.21 mi
41:41
Rank: #4072 (-1280)
5K → 10K
21:13 | 6:50/mi
15K· 9.32 mi
1:03:36
Rank: #5211 (-1139)
10K → 15K
21:55 | 7:03/mi
20K· 12.43 mi
1:26:29
Rank: #6102 (-891)
15K → 20K
22:53 | 7:22/mi
Half· 13.11 mi
1:31:27
Rank: #6219 (-117)
20K → Half
4:58 | 7:17/mi
25K· 15.53 mi
1:49:58
Rank: #6660 (-441)
Half → 25K
18:31 | 7:38/mi
30K· 18.64 mi
2:15:06
Rank: #7279 (-619)
25K → 30K
25:08 | 8:05/mi
20M
2:26:14
Rank: #7529 (-250)
30K → 20M
11:08 | 8:12/mi
21M
2:34:58
Rank: #7710 (-181)
20M → 21M
8:44 | 8:44/mi
35K· 21.75 mi
2:40:53
Rank: #7829 (-119)
21M → 35K
5:55 | 7:55/mi
23M
2:51:23
Rank: #8093 (-264)
35K → 23M
10:30 | 8:23/mi
24M
2:59:38
Rank: #8294 (-201)
23M → 24M
8:15 | 8:15/mi
40K· 24.85 mi
3:06:39
Rank: #8383 (-89)
24M → 40K
7:01 | 8:12/mi
25.2M
3:09:38
Rank: #8405 (-22)
40K → 25.2M
2:59 | 8:39/mi
Finish· 26.22 mi
3:17:28
Rank: #8450 (-45)
25.2M → Finish
7:50 | 7:41/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
Time1:31:27
Pace6:59 /mi
2nd Half
Distance13.11 mi
Time1:46:01
Pace8:05 /mi
📊Positive Split: 15.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:21:1520:286:3520:28
6:35
-
10K
6.21 mi10:42:2841:416:4221:13
6:50
+0:15
15K
9.32 mi11:04:231:03:366:4921:55
7:03
+0:13
20K
12.43 mi11:27:161:26:296:5822:53
7:22
+0:19
Half
13.11 mi11:32:141:31:276:594:58
7:17
-0:05
25K
15.53 mi11:50:451:49:587:0518:31
7:38
+0:21
30K
18.64 mi12:15:532:15:067:1525:08
8:05
+0:27
20M
20.00 mi12:27:012:26:147:1911:08
8:12
+0:07
21M
21.00 mi12:35:452:34:587:238:44
8:44
+0:32
35K
21.75 mi12:41:402:40:537:245:55
7:55
-0:49
23M
23.00 mi12:52:102:51:237:2710:30
8:23
+0:28
24M
24.00 mi13:00:252:59:387:298:15
8:15
-0:08
40K
24.85 mi13:07:263:06:397:317:01
8:12
-0:03
25.2M
25.20 mi13:10:253:09:387:322:59
8:39
+0:27
Finish
26.22 mi13:18:153:17:287:327:50
7:41
-0:58

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

6:35 /mi

Average Pace

7:32 /mi

Slowest Pace

8:44 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:31:27

46% of race

Time at Steady Pace

1:15:33

38% of race

Time at Slower Pace

30:28

15% of race

Average Pace: 7:32 /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 mi10:21:1520:286:3520:28
6:35
#2792
10K
6.21 mi10:42:2841:416:4221:13
6:50
#4072
15K
9.32 mi11:04:231:03:366:4921:55
7:03
#5211
20K
12.43 mi11:27:161:26:296:5822:53
7:22
#6102
Half
13.11 mi11:32:141:31:276:594:58
7:17
#6219
25K
15.53 mi11:50:451:49:587:0518:31
7:38
#6660
30K
18.64 mi12:15:532:15:067:1525:08
8:05
#7279
20M
20.00 mi12:27:012:26:147:1911:08
8:12
#7529
21M
21.00 mi12:35:452:34:587:238:44
8:44
#7710
35K
21.75 mi12:41:402:40:537:245:55
7:55
#7829
23M
23.00 mi12:52:102:51:237:2710:30
8:23
#8093
24M
24.00 mi13:00:252:59:387:298:15
8:15
#8294
40K
24.85 mi13:07:263:06:397:317:01
8:12
#8383
25.2M
25.20 mi13:10:253:09:387:322:59
8:39
#8405
Finish
26.22 mi13:18:153:17:287:327:50
7:41
#8450
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2792265726576884(Top 26%)6157(Top 41%)6157(Top 116%)
10K6.21 mi3.10 mi4072-12803828-11713828-11715575(Top 21%)5125(Top 34%)5125(Top 97%)
15K9.32 mi3.11 mi5211-11394829-10014829-10016884(Top 26%)6157(Top 41%)6157(Top 116%)
20K12.43 mi3.11 mi6102-8915553-7245553-7248255(Top 31%)7047(Top 46%)7047(Top 133%)
Half13.11 mi0.68 mi6219-1175648-955648-958419(Top 32%)7158(Top 47%)7158(Top 135%)
25K15.53 mi2.42 mi6660-4415975-3275975-3279810(Top 37%)7872(Top 52%)7872(Top 149%)
30K18.64 mi3.11 mi7279-6196414-4396414-43911557(Top 43%)8606(Top 57%)8606(Top 163%)
20M20.00 mi1.36 mi7529-2506549-1356549-13511623(Top 44%)8528(Top 56%)8528(Top 161%)
21M21.00 mi1.00 mi7710-1816655-1066655-10611830(Top 44%)8491(Top 56%)8491(Top 161%)
35K21.75 mi0.75 mi7829-1196726-716726-7111400(Top 43%)8290(Top 55%)8290(Top 157%)
23M23.00 mi1.25 mi8093-2646865-1396865-13912461(Top 47%)8662(Top 57%)8662(Top 164%)
24M24.00 mi1.00 mi8294-2016968-1036968-10312896(Top 48%)8788(Top 58%)8788(Top 166%)
40K24.85 mi0.85 mi8383-897005-377005-3711360(Top 43%)7994(Top 53%)7994(Top 151%)
25.2M25.20 mi0.35 mi8405-227011-67011-610363(Top 39%)7461(Top 49%)7461(Top 141%)
Finish26.22 mi1.02 mi8450-457017-67017-69864(Top 37%)7209(Top 48%)7209(Top 136%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 26%
×21stories
+97ft-345ft

Overall

6884

Males

6157

M18-39

6157

5K→10K

3.1 - 6.2 mi

Top 21%
×5stories
+79ft-138ft

Overall

5575

Males

5125

M18-39

5125

10K→15K

6.2 - 9.3 mi

Top 26%
×3stories
+67ft-78ft

Overall

6884

Males

6157

M18-39

6157

15K→20K

9.3 - 12.4 mi

Top 31%
×5stories
+106ft-86ft

Overall

8255

Males

7047

M18-39

7047

20K→Half

12.4 - 13.1 mi

Top 32%
×2stories
+19ft-37ft

Overall

8419

Males

7158

M18-39

7158

Half→25K

13.1 - 15.5 mi

Top 37%
×4stories
+66ft-88ft

Overall

9810

Males

7872

M18-39

7872

25K→30K

15.5 - 18.6 mi

Top 43%
×9stories
+181ft-148ft

Overall

11557

Males

8606

M18-39

8606

30K→20M

18.6 - 20.0 mi

Top 44%
×5stories
+64ft-50ft

Overall

11623

Males

8528

M18-39

8528

20M→21M

20.0 - 21.0 mi

Top 44%
×8stories
+106ft-24ft

Overall

11830

Males

8491

M18-39

8491

21M→35K

21.0 - 21.8 mi

Top 43%
×7stories
+17ft-86ft

Overall

11400

Males

8290

M18-39

8290

35K→23M

21.8 - 23.0 mi

Top 47%
×5stories
+23ft-63ft

Overall

12461

Males

8662

M18-39

8662

23M→24M

23.0 - 24.0 mi

Top 48%
×6stories
+12ft-82ft

Overall

12896

Males

8788

M18-39

8788

24M→40K

24.0 - 24.9 mi

Top 43%
×1story
+6ft-20ft

Overall

11360

Males

7994

M18-39

7994

40K→25.2M

24.9 - 25.2 mi

Top 39%
×1story
+13ft-16ft

Overall

10363

Males

7461

M18-39

7461

25.2M→Finish

25.2 - 26.2 mi

Top 37%
×2stories
+22ft-21ft

Overall

9864

Males

7209

M18-39

7209

Passing Analysis

Category:
Athletes Passed
284
Passed By
5942
Net Change
-5658
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2792
5K → 10K71287-1280#2792#4072
10K → 15K91148-1139#4072#5211
15K → 20K10901-891#5211#6102
20K → Half0117-117#6102#6219
Half → 25K14455-441#6219#6660
25K → 30K16635-619#6660#7279
30K → 20M27277-250#7279#7529
20M → 21M16197-181#7529#7710
21M → 35K19138-119#7710#7829
35K → 23M28292-264#7829#8093
23M → 24M27228-201#8093#8294
24M → 40K32121-89#8294#8383
40K → 25.2M2143-22#8383#8405
25.2M → Finish58103-45#8405#8450
TOTALS2845942-5658
📊

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