Boston Marathon logo
BOSTON MARATHON 2023

Daniel Brosius

Bib: 3809•M

PA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 3%
Gender (Male)
#0 / 15176
Top 5%
Division (M18-39)
#0 / 5285
Top 13%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ 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
6:24/mi
19:54
↑ 97↓ 3451.5%
10K· 6.21 mi
6:15/mi
39:20
↑ 79↓ 1380.4%
15K· 9.32 mi
6:16/mi
58:48
↑ 67↓ 78
20K· 12.43 mi
6:12/mi
1:18:04
↑ 106↓ 860.1%
Half· 13.11 mi
6:12/mi
1:22:18
↑ 19↓ 370.5%
25K· 15.53 mi
6:14/mi
1:37:24
↑ 66↓ 880.2%
30K· 18.64 mi
6:21/mi
1:57:09
↑ 181↓ 1480.2%
20M
6:17/mi
2:05:41
↑ 64↓ 500.2%
21M
6:24/mi
2:12:05
↑ 106↓ 241.6%
35K· 21.75 mi
6:01/mi
2:16:35
↑ 17↓ 861.7%
23M
6:06/mi
2:24:13
↑ 23↓ 630.6%
24M
5:55/mi
2:30:08
↓ 821.3%
40K· 24.85 mi
5:50/mi
2:35:07
↓ 200.3%
25.2M
6:14/mi
2:37:16
↑ 13↓ 160.2%
Finish· 26.22 mi
5:41/mi
2:43:04
↑ 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 Half
Distance13.11 mi
Time1:22:18
Pace6:17 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:20:46
Pace6:10 /mi
📊Negative Split: 1.9% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:21:1619:546:2419:54
6:24
-
10K
6.21 mi10:40:4239:206:2019:26
6:15
-0:09
15K
9.32 mi11:00:1058:486:1919:28
6:16
+0:01
20K
12.43 mi11:19:261:18:046:1719:16
6:12
-0:04
Half
13.11 mi11:23:401:22:186:174:14
6:12
0:00
25K
15.53 mi11:38:461:37:246:1615:06
6:14
+0:02
30K
18.64 mi11:58:311:57:096:1719:45
6:21
+0:07
20M
20.00 mi12:07:032:05:416:178:32
6:17
-0:04
21M
21.00 mi12:13:272:12:056:176:24
6:24
+0:07
35K
21.75 mi12:17:572:16:356:174:30
6:01
-0:23
23M
23.00 mi12:25:352:24:136:167:38
6:06
+0:05
24M
24.00 mi12:31:302:30:086:155:55
5:55
-0:11
40K
24.85 mi12:36:292:35:076:144:59
5:50
-0:05
25.2M
25.20 mi12:38:382:37:166:142:09
6:14
+0:24
Finish
26.22 mi12:44:262:43:046:135:48
5:41
-0:33

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

5:41 /mi

Average Pace

6:13 /mi

Slowest Pace

6:24 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:29:01

55% of race

Time at Steady Pace

1:14:03

45% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:13 /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 mi10:21:1619:546:2419:54
6:24
#1824
10K
6.21 mi10:40:4239:206:2019:26
6:15
#1688
15K
9.32 mi11:00:1058:486:1919:28
6:16
#1617
20K
12.43 mi11:19:261:18:046:1719:16
6:12
#1428
Half
13.11 mi11:23:401:22:186:174:14
6:12
#1423
25K
15.53 mi11:38:461:37:246:1615:06
6:14
#1347
30K
18.64 mi11:58:311:57:096:1719:45
6:21
#1278
20M
20.00 mi12:07:032:05:416:178:32
6:17
#1228
21M
21.00 mi12:13:272:12:056:176:24
6:24
#1145
35K
21.75 mi12:17:572:16:356:174:30
6:01
#1119
23M
23.00 mi12:25:352:24:136:167:38
6:06
#1064
24M
24.00 mi12:31:302:30:086:155:55
5:55
#999
40K
24.85 mi12:36:292:35:076:144:59
5:50
#939
25.2M
25.20 mi12:38:382:37:166:142:09
6:14
#917
Finish
26.22 mi12:44:262:43:046:135:48
5:41
#858
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1824173917391482(Top 6%)1414(Top 9%)1414(Top 27%)
10K6.21 mi3.10 mi1688+1361612+1271612+1271571(Top 6%)1501(Top 10%)1501(Top 28%)
15K9.32 mi3.11 mi1617+711544+681544+681482(Top 6%)1414(Top 9%)1414(Top 27%)
20K12.43 mi3.11 mi1428+1891362+1821362+1821053(Top 4%)1003(Top 7%)1003(Top 19%)
Half13.11 mi0.68 mi1423+51356+61356+61344(Top 5%)1284(Top 8%)1284(Top 24%)
25K15.53 mi2.42 mi1347+761285+711285+711057(Top 4%)1006(Top 7%)1006(Top 19%)
30K18.64 mi3.11 mi1278+691222+631222+631076(Top 4%)1024(Top 7%)1024(Top 19%)
20M20.00 mi1.36 mi1228+501173+491173+49826(Top 3%)786(Top 5%)786(Top 15%)
21M21.00 mi1.00 mi1145+831092+811092+81496(Top 2%)462(Top 3%)462(Top 9%)
35K21.75 mi0.75 mi1119+261066+261066+26720(Top 3%)680(Top 4%)680(Top 13%)
23M23.00 mi1.25 mi1064+551012+541012+54456(Top 2%)426(Top 3%)426(Top 8%)
24M24.00 mi1.00 mi999+65950+62950+62412(Top 2%)386(Top 3%)386(Top 7%)
40K24.85 mi0.85 mi939+60892+58892+58170(Top 0.6%)153(Top 1%)153(Top 3%)
25.2M25.20 mi0.35 mi917+22870+22870+22192(Top 0.7%)173(Top 1%)173(Top 3%)
Finish26.22 mi1.02 mi858+59812+58812+58229(Top 0.9%)212(Top 1%)212(Top 4%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 6%
×21story building
+97ft-345ft

Overall

1482

Males

1414

M18-39

1414

5K→10K

3.1 - 6.2 mi

Top 6%
×5story building
+79ft-138ft

Overall

1571

Males

1501

M18-39

1501

10K→15K

6.2 - 9.3 mi

Top 6%
×3story building
+67ft-78ft

Overall

1482

Males

1414

M18-39

1414

15K→20K

9.3 - 12.4 mi

Top 4%
×5story building
+106ft-86ft

Overall

1053

Males

1003

M18-39

1003

20K→Half

12.4 - 13.1 mi

Top 5%
×2story building
+19ft-37ft

Overall

1344

Males

1284

M18-39

1284

Half→25K

13.1 - 15.5 mi

Top 4%
×4story building
+66ft-88ft

Overall

1057

Males

1006

M18-39

1006

25K→30K

15.5 - 18.6 mi

Top 4%
×9story building
+181ft-148ft

Overall

1076

Males

1024

M18-39

1024

30K→20M

18.6 - 20.0 mi

Top 3%
×5story building
+64ft-50ft

Overall

826

Males

786

M18-39

786

20M→21M

20.0 - 21.0 mi

Top 2%
×8story building
+106ft-24ft

Overall

496

Males

462

M18-39

462

21M→35K

21.0 - 21.8 mi

Top 3%
×7story building
+17ft-86ft

Overall

720

Males

680

M18-39

680

35K→23M

21.8 - 23.0 mi

Top 2%
×5story building
+23ft-63ft

Overall

456

Males

426

M18-39

426

23M→24M

23.0 - 24.0 mi

Top 2%
×6story building
+12ft-82ft

Overall

412

Males

386

M18-39

386

24M→40K

24.0 - 24.9 mi

Top 0.6%
×1story
+6ft-20ft

Overall

170

Males

153

M18-39

153

40K→25.2M

24.9 - 25.2 mi

Top 0.7%
×1story
+13ft-16ft

Overall

192

Males

173

M18-39

173

25.2M→Finish

25.2 - 26.2 mi

Top 0.9%
×2story building
+22ft-21ft

Overall

229

Males

212

M18-39

212

Passing Analysis

Category:
Athletes Passed
1058
Passed By
92
Net Change
+966
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1824
5K → 10K17640+136#1824#1688
10K → 15K9928+71#1688#1617
15K → 20K1901+189#1617#1428
20K → Half127+5#1428#1423
Half → 25K782+76#1423#1347
25K → 30K789+69#1347#1278
30K → 20M533+50#1278#1228
20M → 21M830+83#1228#1145
21M → 35K271+26#1145#1119
35K → 23M561+55#1119#1064
23M → 24M650+65#1064#999
24M → 40K600+60#999#939
40K → 25.2M220+22#939#917
25.2M → Finish590+59#917#858
TOTALS105892+966
📊

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