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BOSTON MARATHON 2026

Jaroslaw Lacki

Bib: 29510•M

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0:00
0:00
/ mi
Masters
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Overall
#0 / 29021
Gender (Male)
#0 / 16340
Masters (Masters Men)
#0 / 10617
Age Group (M45-49)
#0 / 2413
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
27:50
3.11 mi
Rank: #22453
Start → 5K
27:50 | 8:58/mi
10K
53:35
6.21 mi
Rank: #20889 (+1564)
5K → 10K
25:45 | 8:18/mi
15K
1:20:40
9.32 mi
Rank: #21042 (-153)
10K → 15K
27:05 | 8:44/mi
20K
1:49:23
12.43 mi
Rank: #21555 (-513)
15K → 20K
28:43 | 9:15/mi
HALF
1:55:10
13.11 mi
Rank: #21484 (+71)
20K → HALF
5:47 | 8:30/mi
25K
2:18:07
15.53 mi
Rank: #21751 (-267)
HALF → 25K
22:57 | 9:28/mi
30K
2:51:01
18.64 mi
Rank: #22526 (-775)
25K → 30K
32:54 | 10:36/mi
20M
3:06:03
20.00 mi
Rank: #22790 (-264)
30K → 20M
15:02 | 11:05/mi
21M
3:17:57
21.00 mi
Rank: #22932 (-142)
20M → 21M
11:54 | 11:54/mi
35K
3:26:07
21.75 mi
Rank: #23040 (-108)
21M → 35K
8:10 | 10:55/mi
23M
3:41:04
23.00 mi
Rank: #23286 (-246)
35K → 23M
14:57 | 11:57/mi
24M
3:51:06
24.00 mi
Rank: #23258 (+28)
23M → 24M
10:02 | 10:02/mi
40K
4:00:31
24.85 mi
Rank: #23306 (-48)
24M → 40K
9:25 | 11:01/mi
25.2M
4:04:50
25.20 mi
Rank: #23330 (-24)
40K → 25.2M
4:19 | 12:32/mi
FINISH
4:15:28
26.22 mi
Rank: #23381 (-51)
25.2M → FINISH
10:38 | 10:27/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:55:10
Pace8:48 /mi
2nd Half
Distance13.11 mi
Time2:20:18
Pace10:43 /mi
📊Positive Split: 21.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:52:0127:508:5827:50
8:58
-
10K
6.21 mi12:17:4653:358:3825:45
8:18
-0:40
15K
9.32 mi12:44:511:20:408:4027:05
8:44
+0:26
20K
12.43 mi13:13:341:49:238:4928:43
9:15
+0:31
HALF
13.11 mi13:19:211:55:108:485:47
8:30
-0:45
25K
15.53 mi13:42:182:18:078:5422:57
9:28
+0:58
30K
18.64 mi14:15:122:51:019:1132:54
10:36
+1:08
20M
20.00 mi14:30:143:06:039:1915:02
11:05
+0:29
21M
21.00 mi14:42:083:17:579:2611:54
11:54
+0:49
35K
21.75 mi14:50:183:26:079:298:10
10:55
-0:59
23M
23.00 mi15:05:153:41:049:3714:57
11:57
+1:02
24M
24.00 mi15:15:173:51:069:3810:02
10:02
-1:55
40K
24.85 mi15:24:424:00:319:419:25
11:01
+0:59
25.2M
25.20 mi15:29:014:04:509:434:19
12:32
+1:31
FINISH
26.22 mi15:39:394:15:289:4610:38
10:27
-2:05

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

8:18 /mi

Average Pace

9:45 /mi

Slowest Pace

12:32 /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

2:18:07

54% of race

Time at Steady Pace

1:26:11

34% of race

Time at Slower Pace

31:10

12% of race

Average Pace: 9:45 /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 mi11:52:0127:508:5827:50
8:58
#22453
10K
6.21 mi12:17:4653:358:3825:45
8:18
#20889
15K
9.32 mi12:44:511:20:408:4027:05
8:44
#21042
20K
12.43 mi13:13:341:49:238:4928:43
9:15
#21555
HALF
13.11 mi13:19:211:55:108:485:47
8:30
#21484
25K
15.53 mi13:42:182:18:078:5422:57
9:28
#21751
30K
18.64 mi14:15:122:51:019:1132:54
10:36
#22526
20M
20.00 mi14:30:143:06:039:1915:02
11:05
#22790
21M
21.00 mi14:42:083:17:579:2611:54
11:54
#22932
35K
21.75 mi14:50:183:26:079:298:10
10:55
#23040
23M
23.00 mi15:05:153:41:049:3714:57
11:57
#23286
24M
24.00 mi15:15:173:51:069:3810:02
10:02
#23258
40K
24.85 mi15:24:424:00:319:419:25
11:01
#23306
25.2M
25.20 mi15:29:014:04:509:434:19
12:32
#23330
FINISH
26.22 mi15:39:394:15:289:4610:38
10:27
#23381
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi22453134571345721306(Top 73%)12930(Top 79%)12930(Top 536%)
10K6.21 mi3.10 mi20889+156412712+74512712+74519103(Top 66%)11942(Top 73%)11942(Top 495%)
15K9.32 mi3.11 mi21042-15312791-7912791-7921306(Top 73%)12930(Top 79%)12930(Top 536%)
20K12.43 mi3.11 mi21555-51313023-23213023-23222922(Top 79%)13693(Top 84%)13693(Top 567%)
HALF13.11 mi0.68 mi21484+7112985+3812985+3820150(Top 69%)12423(Top 76%)12423(Top 515%)
25K15.53 mi2.42 mi21751-26713122-13713122-13722907(Top 79%)13655(Top 84%)13655(Top 566%)
30K18.64 mi3.11 mi22526-77513471-34913471-34924490(Top 84%)14282(Top 87%)14282(Top 592%)
20M20.00 mi1.36 mi22790-26413586-11513586-11525038(Top 86%)14481(Top 89%)14481(Top 600%)
21M21.00 mi1.00 mi22932-14213635-4913635-4924892(Top 86%)14352(Top 88%)14352(Top 595%)
35K21.75 mi0.75 mi23040-10813680-4513680-4525114(Top 87%)14438(Top 88%)14438(Top 598%)
23M23.00 mi1.25 mi23286-24613790-11013790-11026043(Top 90%)14848(Top 91%)14848(Top 615%)
24M24.00 mi1.00 mi23258+2813768+2213768+2222894(Top 79%)13318(Top 82%)13318(Top 552%)
40K24.85 mi0.85 mi23306-4813776-813776-824280(Top 84%)13917(Top 85%)13917(Top 577%)
25.2M25.20 mi0.35 mi23330-2413788-1213788-1225340(Top 87%)14452(Top 88%)14452(Top 599%)
FINISH26.22 mi1.02 mi23381-5113801-1313801-1324922(Top 86%)14231(Top 87%)14231(Top 590%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 73%
×21
+97ft-345ft

Overall

21306

Males

12930

M45-49

12930

5K→10K

3.1 - 6.2 mi

Top 66%
×5
+79ft-138ft

Overall

19103

Males

11942

M45-49

11942

10K→15K

6.2 - 9.3 mi

Top 73%
×3
+67ft-78ft

Overall

21306

Males

12930

M45-49

12930

15K→20K

9.3 - 12.4 mi

Top 79%
×5
+106ft-86ft

Overall

22922

Males

13693

M45-49

13693

20K→HALF

12.4 - 13.1 mi

Top 69%
×2
+19ft-37ft

Overall

20150

Males

12423

M45-49

12423

HALF→25K

13.1 - 15.5 mi

Top 79%
×4
+66ft-88ft

Overall

22907

Males

13655

M45-49

13655

25K→30K

15.5 - 18.6 mi

Top 84%
×9
+181ft-148ft

Overall

24490

Males

14282

M45-49

14282

30K→20M

18.6 - 20.0 mi

Top 86%
×5
+64ft-50ft

Overall

25038

Males

14481

M45-49

14481

20M→21M

20.0 - 21.0 mi

Top 86%
×8
+106ft-24ft

Overall

24892

Males

14352

M45-49

14352

21M→35K

21.0 - 21.8 mi

Top 87%
×7
+17ft-86ft

Overall

25114

Males

14438

M45-49

14438

35K→23M

21.8 - 23.0 mi

Top 90%
×5
+23ft-63ft

Overall

26043

Males

14848

M45-49

14848

23M→24M

23.0 - 24.0 mi

Top 79%
×6
+12ft-82ft

Overall

22894

Males

13318

M45-49

13318

24M→40K

24.0 - 24.9 mi

Top 84%
×1
+6ft-20ft

Overall

24280

Males

13917

M45-49

13917

40K→25.2M

24.9 - 25.2 mi

Top 87%
×1
+13ft-16ft

Overall

25340

Males

14452

M45-49

14452

25.2M→FINISH

25.2 - 26.2 mi

Top 86%
×2
+22ft-21ft

Overall

24922

Males

14231

M45-49

14231

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
2171*
Passed By
1763
Net Change
-928
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22453
5K → 10K1577*13+1564#22453#20889
10K → 15K132200-153#20889#21042
15K → 20K51200-513#21042#21555
20K → HALF754+71#21555#21484
HALF → 25K62200-267#21484#21751
25K → 30K45200-775#21751#22526
30K → 20M19200-264#22526#22790
20M → 21M41183-142#22790#22932
21M → 35K18126-108#22932#23040
35K → 23M9200-246#23040#23286
23M → 24M6335+28#23286#23258
24M → 40K3785-48#23258#23306
40K → 25.2M2145-24#23306#23330
25.2M → FINISH2172-51#23330#23381
TOTALS2171*1763-928

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing