Boston Marathon logo
BOSTON MARATHON 2023

Brent Shirley

Bib: 3258•M

OR

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 22%
Gender (Male)
#0 / 15176
Top 35%
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
21:09
Rank: #4763
Start → 5K
21:09 | 6:48/mi
10K· 6.21 mi
42:27
Rank: #5233 (-470)
5K → 10K
21:18 | 6:51/mi
15K· 9.32 mi
1:03:31
Rank: #5131 (+102)
10K → 15K
21:04 | 6:47/mi
20K· 12.43 mi
1:25:26
Rank: #5521 (-390)
15K → 20K
21:55 | 7:03/mi
Half· 13.11 mi
1:30:18
Rank: #5641 (-120)
20K → Half
4:52 | 7:08/mi
25K· 15.53 mi
1:48:09
Rank: #5985 (-344)
Half → 25K
17:51 | 7:22/mi
30K· 18.64 mi
2:10:34
Rank: #5839 (+146)
25K → 30K
22:25 | 7:13/mi
20M
2:22:16
Rank: #6309 (-470)
30K → 20M
11:42 | 8:37/mi
21M
2:29:46
Rank: #6180 (+129)
20M → 21M
7:30 | 7:30/mi
35K· 21.75 mi
2:35:06
Rank: #6157 (+23)
21M → 35K
5:20 | 7:08/mi
23M
2:44:33
Rank: #6132 (+25)
35K → 23M
9:27 | 7:33/mi
24M
2:51:52
Rank: #6090 (+42)
23M → 24M
7:19 | 7:19/mi
40K· 24.85 mi
2:58:12
Rank: #6043 (+47)
24M → 40K
6:20 | 7:24/mi
25.2M
3:00:52
Rank: #6011 (+32)
40K → 25.2M
2:40 | 7:44/mi
Finish· 26.22 mi
3:08:06
Rank: #5967 (+44)
25.2M → Finish
7:14 | 7:06/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
Time1:30:18
Pace6:53 /mi
2nd Half
Distance13.11 mi
Time1:37:48
Pace7:28 /mi
📊Positive Split: 8.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:3721:096:4821:09
6:48
-
10K
6.21 mi10:43:5542:276:5021:18
6:51
+0:03
15K
9.32 mi11:04:591:03:316:4921:04
6:47
-0:04
20K
12.43 mi11:26:541:25:266:5221:55
7:03
+0:16
Half
13.11 mi11:31:461:30:186:534:52
7:08
+0:05
25K
15.53 mi11:49:371:48:096:5817:51
7:22
+0:14
30K
18.64 mi12:12:022:10:347:0022:25
7:13
-0:09
20M
20.00 mi12:23:442:22:167:0711:42
8:37
+1:24
21M
21.00 mi12:31:142:29:467:087:30
7:30
-1:07
35K
21.75 mi12:36:342:35:067:085:20
7:08
-0:22
23M
23.00 mi12:46:012:44:337:099:27
7:33
+0:25
24M
24.00 mi12:53:202:51:527:107:19
7:19
-0:14
40K
24.85 mi12:59:402:58:127:106:20
7:24
+0:05
25.2M
25.20 mi13:02:203:00:527:112:40
7:44
+0:20
Finish
26.22 mi13:09:343:08:067:117:14
7:06
-0:38

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

6:47 /mi

Average Pace

7:11 /mi

Slowest Pace

8:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:03:31

34% of race

Time at Steady Pace

1:33:16

50% of race

Time at Slower Pace

31:19

17% of race

Average Pace: 7:10 /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 mi10:22:3721:096:4821:09
6:48
#4763
10K
6.21 mi10:43:5542:276:5021:18
6:51
#5233
15K
9.32 mi11:04:591:03:316:4921:04
6:47
#5131
20K
12.43 mi11:26:541:25:266:5221:55
7:03
#5521
Half
13.11 mi11:31:461:30:186:534:52
7:08
#5641
25K
15.53 mi11:49:371:48:096:5817:51
7:22
#5985
30K
18.64 mi12:12:022:10:347:0022:25
7:13
#5839
20M
20.00 mi12:23:442:22:167:0711:42
8:37
#6309
21M
21.00 mi12:31:142:29:467:087:30
7:30
#6180
35K
21.75 mi12:36:342:35:067:085:20
7:08
#6157
23M
23.00 mi12:46:012:44:337:099:27
7:33
#6132
24M
24.00 mi12:53:202:51:527:107:19
7:19
#6090
40K
24.85 mi12:59:402:58:127:106:20
7:24
#6043
25.2M
25.20 mi13:02:203:00:527:112:40
7:44
#6011
Finish
26.22 mi13:09:343:08:067:117:14
7:06
#5967
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi4763443344334944(Top 19%)4595(Top 30%)4595(Top 87%)
10K6.21 mi3.10 mi5233-4704844-4114844-4115802(Top 22%)5303(Top 35%)5303(Top 100%)
15K9.32 mi3.11 mi5131+1024758+864758+864944(Top 19%)4595(Top 30%)4595(Top 87%)
20K12.43 mi3.11 mi5521-3905092-3345092-3346308(Top 24%)5703(Top 38%)5703(Top 108%)
Half13.11 mi0.68 mi5641-1205199-1075199-1077317(Top 27%)6437(Top 42%)6437(Top 122%)
25K15.53 mi2.42 mi5985-3445472-2735472-2737679(Top 29%)6590(Top 43%)6590(Top 125%)
30K18.64 mi3.11 mi5839+1465341+1315341+1315582(Top 21%)5062(Top 33%)5062(Top 96%)
20M20.00 mi1.36 mi6309-4705686-3455686-34514287(Top 54%)9671(Top 64%)9671(Top 183%)
21M21.00 mi1.00 mi6180+1295573+1135573+1134585(Top 17%)4172(Top 27%)4172(Top 79%)
35K21.75 mi0.75 mi6157+235553+205553+206058(Top 23%)5266(Top 35%)5266(Top 100%)
23M23.00 mi1.25 mi6132+255524+295524+296695(Top 25%)5626(Top 37%)5626(Top 106%)
24M24.00 mi1.00 mi6090+425477+475477+476458(Top 24%)5388(Top 36%)5388(Top 102%)
40K24.85 mi0.85 mi6043+475432+455432+456116(Top 23%)5090(Top 34%)5090(Top 96%)
25.2M25.20 mi0.35 mi6011+325404+285404+285025(Top 19%)4302(Top 28%)4302(Top 81%)
Finish26.22 mi1.02 mi5967+445360+445360+445809(Top 22%)4801(Top 32%)4801(Top 91%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 19%
×21stories
+97ft-345ft

Overall

4944

Males

4595

M18-39

4595

5K→10K

3.1 - 6.2 mi

Top 22%
×5stories
+79ft-138ft

Overall

5802

Males

5303

M18-39

5303

10K→15K

6.2 - 9.3 mi

Top 19%
×3stories
+67ft-78ft

Overall

4944

Males

4595

M18-39

4595

15K→20K

9.3 - 12.4 mi

Top 24%
×5stories
+106ft-86ft

Overall

6308

Males

5703

M18-39

5703

20K→Half

12.4 - 13.1 mi

Top 27%
×2stories
+19ft-37ft

Overall

7317

Males

6437

M18-39

6437

Half→25K

13.1 - 15.5 mi

Top 29%
×4stories
+66ft-88ft

Overall

7679

Males

6590

M18-39

6590

25K→30K

15.5 - 18.6 mi

Top 21%
×9stories
+181ft-148ft

Overall

5582

Males

5062

M18-39

5062

30K→20M

18.6 - 20.0 mi

Top 54%
×5stories
+64ft-50ft

Overall

14287

Males

9671

M18-39

9671

20M→21M

20.0 - 21.0 mi

Top 17%
×8stories
+106ft-24ft

Overall

4585

Males

4172

M18-39

4172

21M→35K

21.0 - 21.8 mi

Top 23%
×7stories
+17ft-86ft

Overall

6058

Males

5266

M18-39

5266

35K→23M

21.8 - 23.0 mi

Top 25%
×5stories
+23ft-63ft

Overall

6695

Males

5626

M18-39

5626

23M→24M

23.0 - 24.0 mi

Top 24%
×6stories
+12ft-82ft

Overall

6458

Males

5388

M18-39

5388

24M→40K

24.0 - 24.9 mi

Top 23%
×1story
+6ft-20ft

Overall

6116

Males

5090

M18-39

5090

40K→25.2M

24.9 - 25.2 mi

Top 19%
×1story
+13ft-16ft

Overall

5025

Males

4302

M18-39

4302

25.2M→Finish

25.2 - 26.2 mi

Top 22%
×2stories
+22ft-21ft

Overall

5809

Males

4801

M18-39

4801

Passing Analysis

Category:
Athletes Passed
1009
Passed By
2213
Net Change
-1204
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4763
5K → 10K73543-470#4763#5233
10K → 15K16563+102#5233#5131
15K → 20K34424-390#5131#5521
20K → Half2122-120#5521#5641
Half → 25K13357-344#5641#5985
25K → 30K19852+146#5985#5839
30K → 20M4474-470#5839#6309
20M → 21M1378+129#6309#6180
21M → 35K4219+23#6180#6157
35K → 23M8156+25#6157#6132
23M → 24M7129+42#6132#6090
24M → 40K6922+47#6090#6043
40K → 25.2M375+32#6043#6011
25.2M → Finish8339+44#6011#5967
TOTALS10092213-1204
📊

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