Boston Marathon logo
BOSTON MARATHON 2023

Frederick Kostecki

Bib: 25159•M

MO

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M50-54)
#0 / 2052
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
30:56
Rank: #23344
Start → 5K
30:56 | 9:57/mi
10K· 6.21 mi
1:03:39
Rank: #24147 (-803)
5K → 10K
32:43 | 10:32/mi
15K· 9.32 mi
1:36:08
Rank: #24252 (-105)
10K → 15K
32:29 | 10:27/mi
20K· 12.43 mi
2:09:22
Rank: #24247 (+5)
15K → 20K
33:14 | 10:42/mi
Half· 13.11 mi
2:16:30
Rank: #24226 (+21)
20K → Half
7:08 | 10:27/mi
25K· 15.53 mi
2:43:13
Rank: #24181 (+45)
Half → 25K
26:43 | 11:01/mi
30K· 18.64 mi
3:20:07
Rank: #24235 (-54)
25K → 30K
36:54 | 11:53/mi
20M
3:37:32
Rank: #24334 (-99)
30K → 20M
17:25 | 12:49/mi
21M
3:50:02
Rank: #24277 (+57)
20M → 21M
12:30 | 12:30/mi
35K· 21.75 mi
3:58:41
Rank: #24269 (+8)
21M → 35K
8:39 | 11:34/mi
23M
4:13:32
Rank: #24268 (+1)
35K → 23M
14:51 | 11:52/mi
24M
4:25:00
Rank: #24248 (+20)
23M → 24M
11:28 | 11:28/mi
40K· 24.85 mi
4:35:04
Rank: #24236 (+12)
24M → 40K
10:04 | 11:46/mi
25.2M
4:39:29
Rank: #24229 (+7)
40K → 25.2M
4:25 | 12:48/mi
Finish· 26.22 mi
4:50:28
Rank: #24214 (+15)
25.2M → Finish
10:59 | 10:47/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
Time2:16:30
Pace10:25 /mi
2nd Half
Distance13.11 mi
Time2:33:58
Pace11:45 /mi
📊Positive Split: 12.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:5330:569:5730:56
9:57
-
10K
6.21 mi12:19:361:03:3910:1532:43
10:32
+0:35
15K
9.32 mi12:52:051:36:0810:1932:29
10:27
-0:05
20K
12.43 mi13:25:192:09:2210:2533:14
10:42
+0:15
Half
13.11 mi13:32:272:16:3010:257:08
10:27
-0:15
25K
15.53 mi13:59:102:43:1310:3026:43
11:01
+0:34
30K
18.64 mi14:36:043:20:0710:4436:54
11:53
+0:52
20M
20.00 mi14:53:293:37:3210:5317:25
12:49
+0:56
21M
21.00 mi15:05:593:50:0210:5712:30
12:30
-0:19
35K
21.75 mi15:14:383:58:4110:588:39
11:34
-0:56
23M
23.00 mi15:29:294:13:3211:0114:51
11:52
+0:18
24M
24.00 mi15:40:574:25:0011:0311:28
11:28
-0:24
40K
24.85 mi15:51:014:35:0411:0410:04
11:46
+0:18
25.2M
25.20 mi15:55:264:39:2911:054:25
12:48
+1:02
Finish
26.22 mi16:06:254:50:2811:0510:59
10:47
-2:01

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

9:57 /mi

Average Pace

11:05 /mi

Slowest Pace

12:49 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:54:12

60% of race

Time at Steady Pace

1:21:56

28% of race

Time at Slower Pace

34:20

12% of race

Average Pace: 11:05 /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 mi11:46:5330:569:5730:56
9:57
#23344
10K
6.21 mi12:19:361:03:3910:1532:43
10:32
#24147
15K
9.32 mi12:52:051:36:0810:1932:29
10:27
#24252
20K
12.43 mi13:25:192:09:2210:2533:14
10:42
#24247
Half
13.11 mi13:32:272:16:3010:257:08
10:27
#24226
25K
15.53 mi13:59:102:43:1310:3026:43
11:01
#24181
30K
18.64 mi14:36:043:20:0710:4436:54
11:53
#24235
20M
20.00 mi14:53:293:37:3210:5317:25
12:49
#24334
21M
21.00 mi15:05:593:50:0210:5712:30
12:30
#24277
35K
21.75 mi15:14:383:58:4110:588:39
11:34
#24269
23M
23.00 mi15:29:294:13:3211:0114:51
11:52
#24268
24M
24.00 mi15:40:574:25:0011:0311:28
11:28
#24248
40K
24.85 mi15:51:014:35:0411:0410:04
11:46
#24236
25.2M
25.20 mi15:55:264:39:2911:054:25
12:48
#24229
Finish
26.22 mi16:06:254:50:2811:0510:59
10:47
#24214
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi23344137521375224378(Top 92%)14250(Top 94%)14250(Top 694%)
10K6.21 mi3.10 mi24147-80314155-40314155-40324721(Top 93%)14410(Top 95%)14410(Top 702%)
15K9.32 mi3.11 mi24252-10514199-4414199-4424378(Top 92%)14250(Top 94%)14250(Top 694%)
20K12.43 mi3.11 mi24247+514198+114198+124167(Top 91%)14140(Top 93%)14140(Top 689%)
Half13.11 mi0.68 mi24226+2114184+1414184+1424117(Top 91%)14115(Top 93%)14115(Top 688%)
25K15.53 mi2.42 mi24181+4514156+2814156+2824009(Top 90%)14029(Top 92%)14029(Top 684%)
30K18.64 mi3.11 mi24235-5414148+814148+824355(Top 91%)14138(Top 93%)14138(Top 689%)
20M20.00 mi1.36 mi24334-9914191-4314191-4325005(Top 94%)14379(Top 95%)14379(Top 701%)
21M21.00 mi1.00 mi24277+5714155+3614155+3623454(Top 88%)13649(Top 90%)13649(Top 665%)
35K21.75 mi0.75 mi24269+814139+1614139+1624185(Top 91%)13944(Top 92%)13944(Top 680%)
23M23.00 mi1.25 mi24268+114136+314136+323800(Top 89%)13774(Top 91%)13774(Top 671%)
24M24.00 mi1.00 mi24248+2014119+1714119+1723823(Top 89%)13737(Top 91%)13737(Top 669%)
40K24.85 mi0.85 mi24236+1214112+714112+723603(Top 89%)13587(Top 90%)13587(Top 662%)
25.2M25.20 mi0.35 mi24229+714103+914103+923713(Top 89%)13651(Top 90%)13651(Top 665%)
Finish26.22 mi1.02 mi24214+1514092+1114092+1123566(Top 89%)13606(Top 90%)13606(Top 663%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 92%
×21stories
+97ft-345ft

Overall

24378

Males

14250

M50-54

14250

5K→10K

3.1 - 6.2 mi

Top 93%
×5stories
+79ft-138ft

Overall

24721

Males

14410

M50-54

14410

10K→15K

6.2 - 9.3 mi

Top 92%
×3stories
+67ft-78ft

Overall

24378

Males

14250

M50-54

14250

15K→20K

9.3 - 12.4 mi

Top 91%
×5stories
+106ft-86ft

Overall

24167

Males

14140

M50-54

14140

20K→Half

12.4 - 13.1 mi

Top 91%
×2stories
+19ft-37ft

Overall

24117

Males

14115

M50-54

14115

Half→25K

13.1 - 15.5 mi

Top 90%
×4stories
+66ft-88ft

Overall

24009

Males

14029

M50-54

14029

25K→30K

15.5 - 18.6 mi

Top 91%
×9stories
+181ft-148ft

Overall

24355

Males

14138

M50-54

14138

30K→20M

18.6 - 20.0 mi

Top 94%
×5stories
+64ft-50ft

Overall

25005

Males

14379

M50-54

14379

20M→21M

20.0 - 21.0 mi

Top 88%
×8stories
+106ft-24ft

Overall

23454

Males

13649

M50-54

13649

21M→35K

21.0 - 21.8 mi

Top 91%
×7stories
+17ft-86ft

Overall

24185

Males

13944

M50-54

13944

35K→23M

21.8 - 23.0 mi

Top 89%
×5stories
+23ft-63ft

Overall

23800

Males

13774

M50-54

13774

23M→24M

23.0 - 24.0 mi

Top 89%
×6stories
+12ft-82ft

Overall

23823

Males

13737

M50-54

13737

24M→40K

24.0 - 24.9 mi

Top 89%
×1story
+6ft-20ft

Overall

23603

Males

13587

M50-54

13587

40K→25.2M

24.9 - 25.2 mi

Top 89%
×1story
+13ft-16ft

Overall

23713

Males

13651

M50-54

13651

25.2M→Finish

25.2 - 26.2 mi

Top 89%
×2stories
+22ft-21ft

Overall

23566

Males

13606

M50-54

13606

Passing Analysis

Category:
Athletes Passed
727
Passed By
1597
Net Change
-870
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23344
5K → 10K19822-803#23344#24147
10K → 15K84189-105#24147#24252
15K → 20K108103+5#24252#24247
20K → Half3514+21#24247#24226
Half → 25K11772+45#24226#24181
25K → 30K93147-54#24181#24235
30K → 20M21120-99#24235#24334
20M → 21M7518+57#24334#24277
21M → 35K2719+8#24277#24269
35K → 23M3433+1#24269#24268
23M → 24M3616+20#24268#24248
24M → 40K3119+12#24248#24236
40K → 25.2M136+7#24236#24229
25.2M → Finish3419+15#24229#24214
TOTALS7271597-870
📊

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