Boston Marathon logo
BOSTON MARATHON 2025

Robert Duncan

Bib: 4963•M

IL

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Top 5%
Gender (Male)
#0 / 16105
Top 9%
Masters (Masters Men)
#0 / 10463
Top 2%
Division (M40-44)
#0 / 2247
Top 7%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
18:55
Rank: #1381
Start → 5K
18:55 | 6:05/mi
10K· 6.21 mi
37:49
Rank: #1372 (+9)
5K → 10K
18:54 | 6:05/mi
15K· 9.32 mi
56:39
Rank: #1310 (+62)
10K → 15K
18:50 | 6:04/mi
20K· 12.43 mi
1:15:39
Rank: #1274 (+36)
15K → 20K
19:00 | 6:07/mi
Half· 13.11 mi
1:19:40
Rank: #1236 (+38)
20K → Half
4:01 | 5:53/mi
25K· 15.53 mi
1:34:29
Rank: #1207 (+29)
Half → 25K
14:49 | 6:07/mi
30K· 18.64 mi
1:54:27
Rank: #1273 (-66)
25K → 30K
19:58 | 6:26/mi
20M
2:03:42
Rank: #1339 (-66)
30K → 20M
9:15 | 6:48/mi
21M
2:10:40
Rank: #1346 (-7)
20M → 21M
6:58 | 6:58/mi
35K· 21.75 mi
2:15:30
Rank: #1359 (-13)
21M → 35K
4:50 | 6:28/mi
23M
2:24:13
Rank: #1431 (-72)
35K → 23M
8:43 | 6:58/mi
24M
2:30:59
Rank: #1470 (-39)
23M → 24M
6:46 | 6:46/mi
40K· 24.85 mi
2:36:50
Rank: #1491 (-21)
24M → 40K
5:51 | 6:51/mi
25.2M
2:39:29
Rank: #1525 (-34)
40K → 25.2M
2:39 | 7:41/mi
Finish· 26.22 mi
2:45:53
Rank: #1514 (+11)
25.2M → Finish
6:24 | 6:17/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
Time1:19:40
Pace6:05 /mi
2nd Half
Distance13.11 mi
Time1:26:13
Pace6:35 /mi
📊Positive Split: 8.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:0918:556:0518:55
6:05
-
10K
6.21 mi10:41:0337:496:0518:54
6:05
0:00
15K
9.32 mi10:59:5356:396:0518:50
6:04
-0:01
20K
12.43 mi11:18:531:15:396:0519:00
6:07
+0:03
Half
13.11 mi11:22:541:19:406:054:01
5:53
-0:14
25K
15.53 mi11:37:431:34:296:0514:49
6:07
+0:14
30K
18.64 mi11:57:411:54:276:0819:58
6:26
+0:19
20M
20.00 mi12:06:562:03:426:119:15
6:48
+0:22
21M
21.00 mi12:13:542:10:406:136:58
6:58
+0:10
35K
21.75 mi12:18:442:15:306:144:50
6:28
-0:30
23M
23.00 mi12:27:272:24:136:168:43
6:58
+0:30
24M
24.00 mi12:34:132:30:596:176:46
6:46
-0:12
40K
24.85 mi12:40:042:36:506:195:51
6:51
+0:05
25.2M
25.20 mi12:42:432:39:296:202:39
7:41
+0:50
Finish
26.22 mi12:49:072:45:536:206:24
6:17
-1:24

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

5:53 /mi

Average Pace

6:20 /mi

Slowest Pace

7:41 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:34:29

57% of race

Time at Steady Pace

31:12

19% of race

Time at Slower Pace

40:12

24% of race

Average Pace: 6:20 /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 mi10:22:0918:556:0518:55
6:05
#1381
10K
6.21 mi10:41:0337:496:0518:54
6:05
#1372
15K
9.32 mi10:59:5356:396:0518:50
6:04
#1310
20K
12.43 mi11:18:531:15:396:0519:00
6:07
#1274
Half
13.11 mi11:22:541:19:406:054:01
5:53
#1236
25K
15.53 mi11:37:431:34:296:0514:49
6:07
#1207
30K
18.64 mi11:57:411:54:276:0819:58
6:26
#1273
20M
20.00 mi12:06:562:03:426:119:15
6:48
#1339
21M
21.00 mi12:13:542:10:406:136:58
6:58
#1346
35K
21.75 mi12:18:442:15:306:144:50
6:28
#1359
23M
23.00 mi12:27:272:24:136:168:43
6:58
#1431
24M
24.00 mi12:34:132:30:596:176:46
6:46
#1470
40K
24.85 mi12:40:042:36:506:195:51
6:51
#1491
25.2M
25.20 mi12:42:432:39:296:202:39
7:41
#1525
Finish
26.22 mi12:49:072:45:536:206:24
6:17
#1514
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi1381131313131239(Top 4%)1175(Top 7%)1175(Top 52%)
10K6.21 mi3.10 mi1372+91305+81305+81413(Top 5%)1341(Top 8%)1341(Top 60%)
15K9.32 mi3.11 mi1310+621245+601245+601239(Top 4%)1175(Top 7%)1175(Top 52%)
20K12.43 mi3.11 mi1274+361205+401205+401232(Top 4%)1167(Top 7%)1167(Top 52%)
Half13.11 mi0.68 mi1236+381169+361169+36834(Top 3%)788(Top 5%)788(Top 35%)
25K15.53 mi2.42 mi1207+291141+281141+281137(Top 4%)1073(Top 7%)1073(Top 48%)
30K18.64 mi3.11 mi1273-661202-611202-611651(Top 6%)1565(Top 10%)1565(Top 70%)
20M20.00 mi1.36 mi1339-661263-611263-612931(Top 10%)2730(Top 17%)2730(Top 121%)
21M21.00 mi1.00 mi1346-71271-81271-82111(Top 7%)1976(Top 12%)1976(Top 88%)
35K21.75 mi0.75 mi1359-131282-111282-112236(Top 8%)2088(Top 13%)2088(Top 93%)
23M23.00 mi1.25 mi1431-721351-691351-693506(Top 12%)3176(Top 20%)3176(Top 141%)
24M24.00 mi1.00 mi1470-391390-391390-393284(Top 12%)2950(Top 18%)2950(Top 131%)
40K24.85 mi0.85 mi1491-211408-181408-183009(Top 11%)2705(Top 17%)2705(Top 120%)
25.2M25.20 mi0.35 mi1525-341441-331441-334165(Top 15%)3521(Top 22%)3521(Top 157%)
Finish26.22 mi1.02 mi1514+111431+101431+101802(Top 6%)1665(Top 10%)1665(Top 74%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 4%
×21stories
+97ft-345ft

Overall

1239

Males

1175

M40-44

1175

5K→10K

3.1 - 6.2 mi

Top 5%
×5stories
+79ft-138ft

Overall

1413

Males

1341

M40-44

1341

10K→15K

6.2 - 9.3 mi

Top 4%
×3stories
+67ft-78ft

Overall

1239

Males

1175

M40-44

1175

15K→20K

9.3 - 12.4 mi

Top 4%
×5stories
+106ft-86ft

Overall

1232

Males

1167

M40-44

1167

20K→Half

12.4 - 13.1 mi

Top 3%
×2stories
+19ft-37ft

Overall

834

Males

788

M40-44

788

Half→25K

13.1 - 15.5 mi

Top 4%
×4stories
+66ft-88ft

Overall

1137

Males

1073

M40-44

1073

25K→30K

15.5 - 18.6 mi

Top 6%
×9stories
+181ft-148ft

Overall

1651

Males

1565

M40-44

1565

30K→20M

18.6 - 20.0 mi

Top 10%
×5stories
+64ft-50ft

Overall

2931

Males

2730

M40-44

2730

20M→21M

20.0 - 21.0 mi

Top 7%
×8stories
+106ft-24ft

Overall

2111

Males

1976

M40-44

1976

21M→35K

21.0 - 21.8 mi

Top 8%
×7stories
+17ft-86ft

Overall

2236

Males

2088

M40-44

2088

35K→23M

21.8 - 23.0 mi

Top 12%
×5stories
+23ft-63ft

Overall

3506

Males

3176

M40-44

3176

23M→24M

23.0 - 24.0 mi

Top 12%
×6stories
+12ft-82ft

Overall

3284

Males

2950

M40-44

2950

24M→40K

24.0 - 24.9 mi

Top 11%
×1story
+6ft-20ft

Overall

3009

Males

2705

M40-44

2705

40K→25.2M

24.9 - 25.2 mi

Top 15%
×1story
+13ft-16ft

Overall

4165

Males

3521

M40-44

3521

25.2M→Finish

25.2 - 26.2 mi

Top 6%
×2stories
+22ft-21ft

Overall

1802

Males

1665

M40-44

1665

Passing Analysis

Category:
Athletes Passed
487
Passed By
620
Net Change
-133
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1381
5K → 10K7162+9#1381#1372
10K → 15K8220+62#1372#1310
15K → 20K6226+36#1310#1274
20K → Half391+38#1274#1236
Half → 25K4819+29#1236#1207
25K → 30K37103-66#1207#1273
30K → 20M1682-66#1273#1339
20M → 21M2431-7#1339#1346
21M → 35K1629-13#1346#1359
35K → 23M1688-72#1359#1431
23M → 24M2160-39#1431#1470
24M → 40K1738-21#1470#1491
40K → 25.2M539-34#1491#1525
25.2M → Finish3322+11#1525#1514
TOTALS487620-133
📊

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