Boston Marathon logo
BOSTON MARATHON 2023

Leonid Slavin

Bib: 6257•M

OH

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 15%
Gender (Male)
#0 / 15176
Top 25%
Masters (Masters Men)
#0 / 9891
Top 12%
Division (M45-49)
#0 / 2252
Top 14%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:55
Rank: #3955
Start → 5K
20:55 | 6:44/mi
10K· 6.21 mi
41:26
Rank: #3680 (+275)
5K → 10K
20:31 | 6:36/mi
15K· 9.32 mi
1:01:56
Rank: #3515 (+165)
10K → 15K
20:30 | 6:36/mi
20K· 12.43 mi
1:22:34
Rank: #3409 (+106)
15K → 20K
20:38 | 6:38/mi
Half· 13.11 mi
1:27:03
Rank: #3395 (+14)
20K → Half
4:29 | 6:34/mi
25K· 15.53 mi
1:43:42
Rank: #3560 (-165)
Half → 25K
16:39 | 6:52/mi
30K· 18.64 mi
2:05:55
Rank: #3899 (-339)
25K → 30K
22:13 | 7:09/mi
20M
2:15:25
Rank: #3882 (+17)
30K → 20M
9:30 | 6:59/mi
21M
2:22:45
Rank: #3842 (+40)
20M → 21M
7:20 | 7:20/mi
35K· 21.75 mi
2:27:48
Rank: #3843 (-1)
21M → 35K
5:03 | 6:45/mi
23M
2:37:02
Rank: #3993 (-150)
35K → 23M
9:14 | 7:22/mi
24M
2:43:47
Rank: #3962 (+31)
23M → 24M
6:45 | 6:45/mi
40K· 24.85 mi
2:49:47
Rank: #3958 (+4)
24M → 40K
6:00 | 7:01/mi
25.2M
2:52:44
Rank: #4069 (-111)
40K → 25.2M
2:57 | 8:33/mi
Finish· 26.22 mi
2:59:40
Rank: #4099 (-30)
25.2M → Finish
6:56 | 6:48/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
Time1:27:03
Pace6:38 /mi
2nd Half
Distance13.11 mi
Time1:32:37
Pace7:04 /mi
📊Positive Split: 6.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:24:3220:556:4420:55
6:44
-
10K
6.21 mi10:45:0341:266:4020:31
6:36
-0:08
15K
9.32 mi11:05:331:01:566:3920:30
6:36
0:00
20K
12.43 mi11:26:111:22:346:3920:38
6:38
+0:02
Half
13.11 mi11:30:401:27:036:384:29
6:34
-0:04
25K
15.53 mi11:47:191:43:426:4116:39
6:52
+0:18
30K
18.64 mi12:09:322:05:556:4522:13
7:09
+0:17
20M
20.00 mi12:19:022:15:256:469:30
6:59
-0:10
21M
21.00 mi12:26:222:22:456:487:20
7:20
+0:21
35K
21.75 mi12:31:252:27:486:485:03
6:45
-0:35
23M
23.00 mi12:40:392:37:026:509:14
7:22
+0:37
24M
24.00 mi12:47:242:43:476:496:45
6:45
-0:37
40K
24.85 mi12:53:242:49:476:506:00
7:01
+0:16
25.2M
25.20 mi12:56:212:52:446:512:57
8:33
+1:32
Finish
26.22 mi13:03:172:59:406:516:56
6:48
-1:45

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

6:34 /mi

Average Pace

6:51 /mi

Slowest Pace

8:33 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

2:17:56

77% of race

Time at Slower Pace

41:44

23% of race

Average Pace: 6:51 /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 mi10:24:3220:556:4420:55
6:44
#3955
10K
6.21 mi10:45:0341:266:4020:31
6:36
#3680
15K
9.32 mi11:05:331:01:566:3920:30
6:36
#3515
20K
12.43 mi11:26:111:22:346:3920:38
6:38
#3409
Half
13.11 mi11:30:401:27:036:384:29
6:34
#3395
25K
15.53 mi11:47:191:43:426:4116:39
6:52
#3560
30K
18.64 mi12:09:322:05:556:4522:13
7:09
#3899
20M
20.00 mi12:19:022:15:256:469:30
6:59
#3882
21M
21.00 mi12:26:222:22:456:487:20
7:20
#3842
35K
21.75 mi12:31:252:27:486:485:03
6:45
#3843
23M
23.00 mi12:40:392:37:026:509:14
7:22
#3993
24M
24.00 mi12:47:242:43:476:496:45
6:45
#3962
40K
24.85 mi12:53:242:49:476:506:00
7:01
#3958
25.2M
25.20 mi12:56:212:52:446:512:57
8:33
#4069
Finish
26.22 mi13:03:172:59:406:516:56
6:48
#4099
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi3955371237123287(Top 12%)3122(Top 21%)3122(Top 139%)
10K6.21 mi3.10 mi3680+2753470+2423470+2423527(Top 13%)3340(Top 22%)3340(Top 148%)
15K9.32 mi3.11 mi3515+1653327+1433327+1433287(Top 12%)3122(Top 21%)3122(Top 139%)
20K12.43 mi3.11 mi3409+1063234+933234+933117(Top 12%)2964(Top 20%)2964(Top 132%)
Half13.11 mi0.68 mi3395+143223+113223+113266(Top 12%)3116(Top 21%)3116(Top 138%)
25K15.53 mi2.42 mi3560-1653373-1503373-1504705(Top 18%)4368(Top 29%)4368(Top 194%)
30K18.64 mi3.11 mi3899-3393676-3033676-3035210(Top 20%)4762(Top 31%)4762(Top 211%)
20M20.00 mi1.36 mi3882+173657+193657+193974(Top 15%)3690(Top 24%)3690(Top 164%)
21M21.00 mi1.00 mi3842+403618+393618+393788(Top 14%)3511(Top 23%)3511(Top 156%)
35K21.75 mi0.75 mi3843-13616+23616+23863(Top 15%)3557(Top 23%)3557(Top 158%)
23M23.00 mi1.25 mi3993-1503745-1293745-1295688(Top 21%)4964(Top 33%)4964(Top 220%)
24M24.00 mi1.00 mi3962+313712+333712+333383(Top 13%)3120(Top 21%)3120(Top 139%)
40K24.85 mi0.85 mi3958+43705+73705+73928(Top 15%)3531(Top 23%)3531(Top 157%)
25.2M25.20 mi0.35 mi4069-1113808-1033808-1039735(Top 37%)7121(Top 47%)7121(Top 316%)
Finish26.22 mi1.02 mi4099-303834-263834-264084(Top 15%)3605(Top 24%)3605(Top 160%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 12%
×21stories
+97ft-345ft

Overall

3287

Males

3122

M45-49

3122

5K→10K

3.1 - 6.2 mi

Top 13%
×5stories
+79ft-138ft

Overall

3527

Males

3340

M45-49

3340

10K→15K

6.2 - 9.3 mi

Top 12%
×3stories
+67ft-78ft

Overall

3287

Males

3122

M45-49

3122

15K→20K

9.3 - 12.4 mi

Top 12%
×5stories
+106ft-86ft

Overall

3117

Males

2964

M45-49

2964

20K→Half

12.4 - 13.1 mi

Top 12%
×2stories
+19ft-37ft

Overall

3266

Males

3116

M45-49

3116

Half→25K

13.1 - 15.5 mi

Top 18%
×4stories
+66ft-88ft

Overall

4705

Males

4368

M45-49

4368

25K→30K

15.5 - 18.6 mi

Top 20%
×9stories
+181ft-148ft

Overall

5210

Males

4762

M45-49

4762

30K→20M

18.6 - 20.0 mi

Top 15%
×5stories
+64ft-50ft

Overall

3974

Males

3690

M45-49

3690

20M→21M

20.0 - 21.0 mi

Top 14%
×8stories
+106ft-24ft

Overall

3788

Males

3511

M45-49

3511

21M→35K

21.0 - 21.8 mi

Top 15%
×7stories
+17ft-86ft

Overall

3863

Males

3557

M45-49

3557

35K→23M

21.8 - 23.0 mi

Top 21%
×5stories
+23ft-63ft

Overall

5688

Males

4964

M45-49

4964

23M→24M

23.0 - 24.0 mi

Top 13%
×6stories
+12ft-82ft

Overall

3383

Males

3120

M45-49

3120

24M→40K

24.0 - 24.9 mi

Top 15%
×1story
+6ft-20ft

Overall

3928

Males

3531

M45-49

3531

40K→25.2M

24.9 - 25.2 mi

Top 37%
×1story
+13ft-16ft

Overall

9735

Males

7121

M45-49

7121

25.2M→Finish

25.2 - 26.2 mi

Top 15%
×2stories
+22ft-21ft

Overall

4084

Males

3605

M45-49

3605

Passing Analysis

Category:
Athletes Passed
1185
Passed By
1329
Net Change
-144
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3955
5K → 10K386111+275#3955#3680
10K → 15K20136+165#3680#3515
15K → 20K13933+106#3515#3409
20K → Half217+14#3409#3395
Half → 25K34199-165#3395#3560
25K → 30K28367-339#3560#3899
30K → 20M7558+17#3899#3882
20M → 21M8646+40#3882#3842
21M → 35K3031-1#3842#3843
35K → 23M28178-150#3843#3993
23M → 24M6433+31#3993#3962
24M → 40K4743+4#3962#3958
40K → 25.2M7118-111#3958#4069
25.2M → Finish3969-30#4069#4099
TOTALS11851329-144
📊

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