Boston Marathon logo
BOSTON MARATHON 2023

Robert Duncan

Bib: 3136•M

IL

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 6%
Gender (Male)
#0 / 15176
Top 10%
Masters (Masters Men)
#0 / 9891
Top 3%
Division (M40-44)
#0 / 2241
Top 8%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K· 3.11 mi
19:14
Rank: #1112
Start → 5K
19:14 | 6:11/mi
10K· 6.21 mi
38:21
Rank: #1140 (-28)
5K → 10K
19:07 | 6:09/mi
15K· 9.32 mi
57:32
Rank: #1131 (+9)
10K → 15K
19:11 | 6:10/mi
20K· 12.43 mi
1:16:40
Rank: #1073 (+58)
15K → 20K
19:08 | 6:10/mi
Half· 13.11 mi
1:20:44
Rank: #1057 (+16)
20K → Half
4:04 | 5:58/mi
25K· 15.53 mi
1:35:50
Rank: #1043 (+14)
Half → 25K
15:06 | 6:14/mi
30K· 18.64 mi
1:55:45
Rank: #1056 (-13)
25K → 30K
19:55 | 6:25/mi
20M
2:04:27
Rank: #1046 (+10)
30K → 20M
8:42 | 6:24/mi
21M
2:11:25
Rank: #1060 (-14)
20M → 21M
6:58 | 6:58/mi
35K· 21.75 mi
2:16:09
Rank: #1064 (-4)
21M → 35K
4:44 | 6:20/mi
23M
2:24:56
Rank: #1157 (-93)
35K → 23M
8:47 | 7:01/mi
24M
2:31:45
Rank: #1216 (-59)
23M → 24M
6:49 | 6:49/mi
40K· 24.85 mi
2:38:10
Rank: #1341 (-125)
24M → 40K
6:25 | 7:30/mi
25.2M
2:41:01
Rank: #1409 (-68)
40K → 25.2M
2:51 | 8:16/mi
Finish· 26.22 mi
2:48:17
Rank: #1513 (-104)
25.2M → Finish
7:16 | 7:08/mi

Course Map & Elevation

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
Time1:20:44
Pace6:09 /mi
2nd Half
Distance13.11 mi
Time1:27:33
Pace6:41 /mi
📊Positive Split: 8.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:20:1619:146:1119:14
6:11
-
10K
6.21 mi10:39:2338:216:1019:07
6:09
-0:02
15K
9.32 mi10:58:3457:326:1019:11
6:10
+0:01
20K
12.43 mi11:17:421:16:406:1019:08
6:10
0:00
Half
13.11 mi11:21:461:20:446:094:04
5:58
-0:12
25K
15.53 mi11:36:521:35:506:1015:06
6:14
+0:16
30K
18.64 mi11:56:471:55:456:1319:55
6:25
+0:11
20M
20.00 mi12:05:292:04:276:138:42
6:24
-0:01
21M
21.00 mi12:12:272:11:256:156:58
6:58
+0:34
35K
21.75 mi12:17:112:16:096:164:44
6:20
-0:38
23M
23.00 mi12:25:582:24:566:188:47
7:01
+0:41
24M
24.00 mi12:32:472:31:456:196:49
6:49
-0:12
40K
24.85 mi12:39:122:38:106:226:25
7:30
+0:41
25.2M
25.20 mi12:42:032:41:016:232:51
8:16
+0:46
Finish
26.22 mi12:49:192:48:176:257:16
7:08
-1:08

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

5:58 /mi

Average Pace

6:25 /mi

Slowest Pace

8:16 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

4:04

2% of race

Time at Steady Pace

2:05:07

74% of race

Time at Slower Pace

39:06

23% of race

Average Pace: 6:25 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:20:1619:146:1119:14
6:11
#1112
10K
6.21 mi10:39:2338:216:1019:07
6:09
#1140
15K
9.32 mi10:58:3457:326:1019:11
6:10
#1131
20K
12.43 mi11:17:421:16:406:1019:08
6:10
#1073
Half
13.11 mi11:21:461:20:446:094:04
5:58
#1057
25K
15.53 mi11:36:521:35:506:1015:06
6:14
#1043
30K
18.64 mi11:56:471:55:456:1319:55
6:25
#1056
20M
20.00 mi12:05:292:04:276:138:42
6:24
#1046
21M
21.00 mi12:12:272:11:256:156:58
6:58
#1060
35K
21.75 mi12:17:112:16:096:164:44
6:20
#1064
23M
23.00 mi12:25:582:24:566:188:47
7:01
#1157
24M
24.00 mi12:32:472:31:456:196:49
6:49
#1216
40K
24.85 mi12:39:122:38:106:226:25
7:30
#1341
25.2M
25.20 mi12:42:032:41:016:232:51
8:16
#1409
Finish
26.22 mi12:49:192:48:176:257:16
7:08
#1513
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi1112105110511167(Top 4%)1113(Top 7%)1113(Top 50%)
10K6.21 mi3.10 mi1140-281077-261077-261188(Top 4%)1127(Top 7%)1127(Top 50%)
15K9.32 mi3.11 mi1131+91071+61071+61167(Top 4%)1113(Top 7%)1113(Top 50%)
20K12.43 mi3.11 mi1073+581018+531018+53936(Top 4%)889(Top 6%)889(Top 40%)
Half13.11 mi0.68 mi1057+161004+141004+14690(Top 3%)650(Top 4%)650(Top 29%)
25K15.53 mi2.42 mi1043+14991+13991+131071(Top 4%)1020(Top 7%)1020(Top 46%)
30K18.64 mi3.11 mi1056-131006-151006-151244(Top 5%)1188(Top 8%)1188(Top 53%)
20M20.00 mi1.36 mi1046+10995+11995+111157(Top 4%)1107(Top 7%)1107(Top 49%)
21M21.00 mi1.00 mi1060-141009-141009-141970(Top 7%)1865(Top 12%)1865(Top 83%)
35K21.75 mi0.75 mi1064-41013-41013-41660(Top 6%)1578(Top 10%)1578(Top 70%)
23M23.00 mi1.25 mi1157-931104-911104-913835(Top 14%)3532(Top 23%)3532(Top 158%)
24M24.00 mi1.00 mi1216-591160-561160-563702(Top 14%)3388(Top 22%)3388(Top 151%)
40K24.85 mi0.85 mi1341-1251278-1181278-1186697(Top 25%)5434(Top 36%)5434(Top 242%)
25.2M25.20 mi0.35 mi1409-681343-651343-657921(Top 30%)6081(Top 40%)6081(Top 271%)
Finish26.22 mi1.02 mi1513-1041446-1031446-1035942(Top 22%)4881(Top 32%)4881(Top 218%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 4%
×21stories
+97ft-345ft

Overall

1167

Males

1113

M40-44

1113

5K→10K

3.1 - 6.2 mi

Top 4%
×5stories
+79ft-138ft

Overall

1188

Males

1127

M40-44

1127

10K→15K

6.2 - 9.3 mi

Top 4%
×3stories
+67ft-78ft

Overall

1167

Males

1113

M40-44

1113

15K→20K

9.3 - 12.4 mi

Top 4%
×5stories
+106ft-86ft

Overall

936

Males

889

M40-44

889

20K→Half

12.4 - 13.1 mi

Top 3%
×2stories
+19ft-37ft

Overall

690

Males

650

M40-44

650

Half→25K

13.1 - 15.5 mi

Top 4%
×4stories
+66ft-88ft

Overall

1071

Males

1020

M40-44

1020

25K→30K

15.5 - 18.6 mi

Top 5%
×9stories
+181ft-148ft

Overall

1244

Males

1188

M40-44

1188

30K→20M

18.6 - 20.0 mi

Top 4%
×5stories
+64ft-50ft

Overall

1157

Males

1107

M40-44

1107

20M→21M

20.0 - 21.0 mi

Top 7%
×8stories
+106ft-24ft

Overall

1970

Males

1865

M40-44

1865

21M→35K

21.0 - 21.8 mi

Top 6%
×7stories
+17ft-86ft

Overall

1660

Males

1578

M40-44

1578

35K→23M

21.8 - 23.0 mi

Top 14%
×5stories
+23ft-63ft

Overall

3835

Males

3532

M40-44

3532

23M→24M

23.0 - 24.0 mi

Top 14%
×6stories
+12ft-82ft

Overall

3702

Males

3388

M40-44

3388

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6697

Males

5434

M40-44

5434

40K→25.2M

24.9 - 25.2 mi

Top 30%
×1story
+13ft-16ft

Overall

7921

Males

6081

M40-44

6081

25.2M→Finish

25.2 - 26.2 mi

Top 22%
×2stories
+22ft-21ft

Overall

5942

Males

4881

M40-44

4881

Passing Analysis

Category:
Athletes Passed
284
Passed By
685
Net Change
-401
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1112
5K → 10K4270-28#1112#1140
10K → 15K3122+9#1140#1131
15K → 20K668+58#1131#1073
20K → Half160+16#1073#1057
Half → 25K2915+14#1057#1043
25K → 30K3548-13#1043#1056
30K → 20M2515+10#1056#1046
20M → 21M1428-14#1046#1060
21M → 35K913-4#1060#1064
35K → 23M497-93#1064#1157
23M → 24M665-59#1157#1216
24M → 40K2127-125#1216#1341
40K → 25.2M068-68#1341#1409
25.2M → Finish5109-104#1409#1513
TOTALS284685-401
📊

Passing Visuals

Category:

📈Position Graph

Loading...

🎨Heatmap Timeline

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