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BOSTON MARATHON 2025

Robert Kacer

Bib: 28576•M

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M55-59)
#0 / 1648
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
11:08/mi
34:35
↑ 97↓ 3451.5%
10K· 6.21 mi
11:09/mi
1:09:12
↑ 79↓ 1380.4%
15K· 9.32 mi
11:27/mi
1:44:45
↑ 67↓ 78
20K· 12.43 mi
12:18/mi
2:22:59
↑ 106↓ 860.1%
Half· 13.11 mi
12:26/mi
2:31:28
↑ 19↓ 370.5%
25K· 15.53 mi
12:16/mi
3:01:12
↑ 66↓ 880.2%
30K· 18.64 mi
13:06/mi
3:41:53
↑ 181↓ 1480.2%
20M
12:34/mi
3:58:57
↑ 64↓ 500.2%
21M
15:05/mi
4:14:02
↑ 106↓ 241.6%
35K· 21.75 mi
12:42/mi
4:23:32
↑ 17↓ 861.7%
23M
12:18/mi
4:38:56
↑ 23↓ 630.6%
24M
11:45/mi
4:50:41
↓ 821.3%
40K· 24.85 mi
12:07/mi
5:01:03
↓ 200.3%
25.2M
15:02/mi
5:06:14
↑ 13↓ 160.2%
Finish· 26.22 mi
10:58/mi
5:17:25
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:31:28
Pace11:33 /mi
2nd Half
Distance13.11 mi
Time2:45:57
Pace12:40 /mi
📊Positive Split: 9.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi12:00:2034:3511:0834:35
11:08
-
10K
6.21 mi12:34:571:09:1211:0834:37
11:09
+0:01
15K
9.32 mi13:10:301:44:4511:1435:33
11:27
+0:18
20K
12.43 mi13:48:442:22:5911:3038:14
12:18
+0:51
Half
13.11 mi13:57:132:31:2811:338:29
12:26
+0:08
25K
15.53 mi14:26:573:01:1211:4029:44
12:16
-0:10
30K
18.64 mi15:07:383:41:5311:5440:41
13:06
+0:50
20M
20.00 mi15:24:423:58:5711:5717:04
12:34
-0:32
21M
21.00 mi15:39:474:14:0212:0615:05
15:05
+2:31
35K
21.75 mi15:49:174:23:3212:079:30
12:42
-2:23
23M
23.00 mi16:04:414:38:5612:0815:24
12:18
-0:24
24M
24.00 mi16:16:264:50:4112:0711:45
11:45
-0:33
40K
24.85 mi16:26:485:01:0312:0710:22
12:07
+0:22
25.2M
25.20 mi16:31:595:06:1412:095:11
15:02
+2:55
Finish
26.22 mi16:43:105:17:2512:0711:11
10:58
-4:04

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

10:58 /mi

Average Pace

12:07 /mi

Slowest Pace

15:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:55:56

37% of race

Time at Steady Pace

2:20:32

44% of race

Time at Slower Pace

1:00:57

19% of race

Average Pace: 12:06 /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 mi12:00:2034:3511:0834:35
11:08
#27692
10K
6.21 mi12:34:571:09:1211:0834:37
11:09
#27469
15K
9.32 mi13:10:301:44:4511:1435:33
11:27
#27358
20K
12.43 mi13:48:442:22:5911:3038:14
12:18
#27391
Half
13.11 mi13:57:132:31:2811:338:29
12:26
#27405
25K
15.53 mi14:26:573:01:1211:4029:44
12:16
#27276
30K
18.64 mi15:07:383:41:5311:5440:41
13:06
#27199
20M
20.00 mi15:24:423:58:5711:5717:04
12:34
#27133
21M
21.00 mi15:39:474:14:0212:0615:05
15:05
#27147
35K
21.75 mi15:49:174:23:3212:079:30
12:42
#27144
23M
23.00 mi16:04:414:38:5612:0815:24
12:18
#27097
24M
24.00 mi16:16:264:50:4112:0711:45
11:45
#27039
40K
24.85 mi16:26:485:01:0312:0710:22
12:07
#26986
25.2M
25.20 mi16:31:595:06:1412:095:11
15:02
#26991
Finish
26.22 mi16:43:105:17:2512:0711:11
10:58
#26953
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi27692158591585927189(Top 96%)15636(Top 97%)15636(Top 949%)
10K6.21 mi3.10 mi27469+22315774+8515774+8527225(Top 96%)15660(Top 97%)15660(Top 950%)
15K9.32 mi3.11 mi27358+11115722+5215722+5227189(Top 96%)15636(Top 97%)15636(Top 949%)
20K12.43 mi3.11 mi27391-3315730-815730-827360(Top 96%)15676(Top 97%)15676(Top 951%)
Half13.11 mi0.68 mi27405-1415731-115731-127729(Top 98%)15817(Top 98%)15817(Top 960%)
25K15.53 mi2.42 mi27276+12915663+6815663+6826707(Top 94%)15386(Top 96%)15386(Top 934%)
30K18.64 mi3.11 mi27199+7715611+5215611+5226773(Top 94%)15336(Top 95%)15336(Top 931%)
20M20.00 mi1.36 mi27133+6615580+3115580+3125970(Top 91%)14903(Top 93%)14903(Top 904%)
21M21.00 mi1.00 mi27147-14155801558027227(Top 96%)15473(Top 96%)15473(Top 939%)
35K21.75 mi0.75 mi27144+315574+615574+626684(Top 94%)15181(Top 94%)15181(Top 921%)
23M23.00 mi1.25 mi27097+4715543+3115543+3125537(Top 90%)14594(Top 91%)14594(Top 886%)
24M24.00 mi1.00 mi27039+5815513+3015513+3025339(Top 89%)14482(Top 90%)14482(Top 879%)
40K24.85 mi0.85 mi26986+5315485+2815485+2825125(Top 88%)14330(Top 89%)14330(Top 870%)
25.2M25.20 mi0.35 mi26991-515486-115486-127147(Top 96%)15352(Top 95%)15352(Top 932%)
Finish26.22 mi1.02 mi26953+3815463+2315463+2325327(Top 89%)14453(Top 90%)14453(Top 877%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 96%
×21story building
+97ft-345ft

Overall

27189

Males

15636

M55-59

15636

5K→10K

3.1 - 6.2 mi

Top 96%
×5story building
+79ft-138ft

Overall

27225

Males

15660

M55-59

15660

10K→15K

6.2 - 9.3 mi

Top 96%
×3story building
+67ft-78ft

Overall

27189

Males

15636

M55-59

15636

15K→20K

9.3 - 12.4 mi

Top 96%
×5story building
+106ft-86ft

Overall

27360

Males

15676

M55-59

15676

20K→Half

12.4 - 13.1 mi

Top 98%
×2story building
+19ft-37ft

Overall

27729

Males

15817

M55-59

15817

Half→25K

13.1 - 15.5 mi

Top 94%
×4story building
+66ft-88ft

Overall

26707

Males

15386

M55-59

15386

25K→30K

15.5 - 18.6 mi

Top 94%
×9story building
+181ft-148ft

Overall

26773

Males

15336

M55-59

15336

30K→20M

18.6 - 20.0 mi

Top 91%
×5story building
+64ft-50ft

Overall

25970

Males

14903

M55-59

14903

20M→21M

20.0 - 21.0 mi

Top 96%
×8story building
+106ft-24ft

Overall

27227

Males

15473

M55-59

15473

21M→35K

21.0 - 21.8 mi

Top 94%
×7story building
+17ft-86ft

Overall

26684

Males

15181

M55-59

15181

35K→23M

21.8 - 23.0 mi

Top 90%
×5story building
+23ft-63ft

Overall

25537

Males

14594

M55-59

14594

23M→24M

23.0 - 24.0 mi

Top 89%
×6story building
+12ft-82ft

Overall

25339

Males

14482

M55-59

14482

24M→40K

24.0 - 24.9 mi

Top 88%
×1story
+6ft-20ft

Overall

25125

Males

14330

M55-59

14330

40K→25.2M

24.9 - 25.2 mi

Top 96%
×1story
+13ft-16ft

Overall

27147

Males

15352

M55-59

15352

25.2M→Finish

25.2 - 26.2 mi

Top 89%
×2story building
+22ft-21ft

Overall

25327

Males

14453

M55-59

14453

Passing Analysis

Category:
Athletes Passed
1082
Passed By
343
Net Change
+739
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#27692
5K → 10K25027+223#27692#27469
10K → 15K14736+111#27469#27358
15K → 20K77110-33#27358#27391
20K → Half1630-14#27391#27405
Half → 25K14819+129#27405#27276
25K → 30K12245+77#27276#27199
30K → 20M748+66#27199#27133
20M → 21M1731-14#27133#27147
21M → 35K1512+3#27147#27144
35K → 23M547+47#27144#27097
23M → 24M602+58#27097#27039
24M → 40K552+53#27039#26986
40K → 25.2M712-5#26986#26991
25.2M → Finish402+38#26991#26953
TOTALS1082343+739
📊

Passing Visuals

Category:
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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing