Boston Marathon logo
BOSTON MARATHON 2023

Kai Leong Sham

Bib: 10259•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 19%
Gender (Male)
#0 / 15176
Top 31%
Masters (Masters Men)
#0 / 9891
Top 16%
Division (M45-49)
#0 / 2252
Top 20%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:58
Rank: #6682
Start → 5K
21:58 | 7:04/mi
10K· 6.21 mi
43:00
Rank: #5971 (+711)
5K → 10K
21:02 | 6:46/mi
15K· 9.32 mi
1:04:16
Rank: #5810 (+161)
10K → 15K
21:16 | 6:51/mi
20K· 12.43 mi
1:25:59
Rank: #5821 (-11)
15K → 20K
21:43 | 6:59/mi
Half· 13.11 mi
1:30:42
Rank: #5834 (-13)
20K → Half
4:43 | 6:55/mi
25K· 15.53 mi
1:47:54
Rank: #5880 (-46)
Half → 25K
17:12 | 7:06/mi
30K· 18.64 mi
2:10:21
Rank: #5757 (+123)
25K → 30K
22:27 | 7:14/mi
20M
2:20:08
Rank: #5688 (+69)
30K → 20M
9:47 | 7:12/mi
21M
2:27:39
Rank: #5601 (+87)
20M → 21M
7:31 | 7:31/mi
35K· 21.75 mi
2:32:43
Rank: #5516 (+85)
21M → 35K
5:04 | 6:46/mi
23M
2:41:32
Rank: #5358 (+158)
35K → 23M
8:49 | 7:03/mi
24M
2:48:26
Rank: #5257 (+101)
23M → 24M
6:54 | 6:54/mi
40K· 24.85 mi
2:54:21
Rank: #5140 (+117)
24M → 40K
5:55 | 6:55/mi
25.2M
2:56:55
Rank: #5095 (+45)
40K → 25.2M
2:34 | 7:27/mi
Finish· 26.22 mi
3:04:03
Rank: #5055 (+40)
25.2M → Finish
7:08 | 7:00/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
Time1:30:42
Pace6:55 /mi
2nd Half
Distance13.11 mi
Time1:33:21
Pace7:07 /mi
📊Positive Split: 2.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:1121:587:0421:58
7:04
-
10K
6.21 mi11:09:1343:006:5521:02
6:46
-0:18
15K
9.32 mi11:30:291:04:166:5421:16
6:51
+0:05
20K
12.43 mi11:52:121:25:596:5521:43
6:59
+0:08
Half
13.11 mi11:56:551:30:426:554:43
6:55
-0:04
25K
15.53 mi12:14:071:47:546:5717:12
7:06
+0:11
30K
18.64 mi12:36:342:10:217:0022:27
7:14
+0:08
20M
20.00 mi12:46:212:20:087:009:47
7:12
-0:02
21M
21.00 mi12:53:522:27:397:027:31
7:31
+0:19
35K
21.75 mi12:58:562:32:437:015:04
6:46
-0:45
23M
23.00 mi13:07:452:41:327:018:49
7:03
+0:17
24M
24.00 mi13:14:392:48:267:016:54
6:54
-0:09
40K
24.85 mi13:20:342:54:217:015:55
6:55
+0:01
25.2M
25.20 mi13:23:082:56:557:012:34
7:27
+0:32
Finish
26.22 mi13:30:163:04:037:017:08
7:00
-0:27

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

6:46 /mi

Average Pace

7:01 /mi

Slowest Pace

7:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:53:58

95% of race

Time at Steady Pace

10:05

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:01 /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 mi10:48:1121:587:0421:58
7:04
#6682
10K
6.21 mi11:09:1343:006:5521:02
6:46
#5971
15K
9.32 mi11:30:291:04:166:5421:16
6:51
#5810
20K
12.43 mi11:52:121:25:596:5521:43
6:59
#5821
Half
13.11 mi11:56:551:30:426:554:43
6:55
#5834
25K
15.53 mi12:14:071:47:546:5717:12
7:06
#5880
30K
18.64 mi12:36:342:10:217:0022:27
7:14
#5757
20M
20.00 mi12:46:212:20:087:009:47
7:12
#5688
21M
21.00 mi12:53:522:27:397:027:31
7:31
#5601
35K
21.75 mi12:58:562:32:437:015:04
6:46
#5516
23M
23.00 mi13:07:452:41:327:018:49
7:03
#5358
24M
24.00 mi13:14:392:48:267:016:54
6:54
#5257
40K
24.85 mi13:20:342:54:217:015:55
6:55
#5140
25.2M
25.20 mi13:23:082:56:557:012:34
7:27
#5095
Finish
26.22 mi13:30:163:04:037:017:08
7:00
#5055
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi6682602660265520(Top 21%)5083(Top 33%)5083(Top 226%)
10K6.21 mi3.10 mi5971+7115463+5635463+5634991(Top 19%)4623(Top 30%)4623(Top 205%)
15K9.32 mi3.11 mi5810+1615331+1325331+1325520(Top 21%)5083(Top 33%)5083(Top 226%)
20K12.43 mi3.11 mi5821-115344-135344-135910(Top 22%)5401(Top 36%)5401(Top 240%)
Half13.11 mi0.68 mi5834-135350-65350-66022(Top 23%)5492(Top 36%)5492(Top 244%)
25K15.53 mi2.42 mi5880-465385-355385-356064(Top 23%)5490(Top 36%)5490(Top 244%)
30K18.64 mi3.11 mi5757+1235278+1075278+1075627(Top 21%)5093(Top 34%)5093(Top 226%)
20M20.00 mi1.36 mi5688+695210+685210+685099(Top 19%)4621(Top 30%)4621(Top 205%)
21M21.00 mi1.00 mi5601+875137+735137+734663(Top 18%)4229(Top 28%)4229(Top 188%)
35K21.75 mi0.75 mi5516+855062+755062+754039(Top 15%)3714(Top 24%)3714(Top 165%)
23M23.00 mi1.25 mi5358+1584916+1464916+1464006(Top 15%)3687(Top 24%)3687(Top 164%)
24M24.00 mi1.00 mi5257+1014824+924824+924179(Top 16%)3805(Top 25%)3805(Top 169%)
40K24.85 mi0.85 mi5140+1174720+1044720+1043448(Top 13%)3149(Top 21%)3149(Top 140%)
25.2M25.20 mi0.35 mi5095+454682+384682+383663(Top 14%)3291(Top 22%)3291(Top 146%)
Finish26.22 mi1.02 mi5055+404642+404642+405196(Top 20%)4404(Top 29%)4404(Top 196%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 21%
×21stories
+97ft-345ft

Overall

5520

Males

5083

M45-49

5083

5K→10K

3.1 - 6.2 mi

Top 19%
×5stories
+79ft-138ft

Overall

4991

Males

4623

M45-49

4623

10K→15K

6.2 - 9.3 mi

Top 21%
×3stories
+67ft-78ft

Overall

5520

Males

5083

M45-49

5083

15K→20K

9.3 - 12.4 mi

Top 22%
×5stories
+106ft-86ft

Overall

5910

Males

5401

M45-49

5401

20K→Half

12.4 - 13.1 mi

Top 23%
×2stories
+19ft-37ft

Overall

6022

Males

5492

M45-49

5492

Half→25K

13.1 - 15.5 mi

Top 23%
×4stories
+66ft-88ft

Overall

6064

Males

5490

M45-49

5490

25K→30K

15.5 - 18.6 mi

Top 21%
×9stories
+181ft-148ft

Overall

5627

Males

5093

M45-49

5093

30K→20M

18.6 - 20.0 mi

Top 19%
×5stories
+64ft-50ft

Overall

5099

Males

4621

M45-49

4621

20M→21M

20.0 - 21.0 mi

Top 18%
×8stories
+106ft-24ft

Overall

4663

Males

4229

M45-49

4229

21M→35K

21.0 - 21.8 mi

Top 15%
×7stories
+17ft-86ft

Overall

4039

Males

3714

M45-49

3714

35K→23M

21.8 - 23.0 mi

Top 15%
×5stories
+23ft-63ft

Overall

4006

Males

3687

M45-49

3687

23M→24M

23.0 - 24.0 mi

Top 16%
×6stories
+12ft-82ft

Overall

4179

Males

3805

M45-49

3805

24M→40K

24.0 - 24.9 mi

Top 13%
×1story
+6ft-20ft

Overall

3448

Males

3149

M45-49

3149

40K→25.2M

24.9 - 25.2 mi

Top 14%
×1story
+13ft-16ft

Overall

3663

Males

3291

M45-49

3291

25.2M→Finish

25.2 - 26.2 mi

Top 20%
×2stories
+22ft-21ft

Overall

5196

Males

4404

M45-49

4404

Passing Analysis

Category:
Athletes Passed
2090
Passed By
463
Net Change
+1627
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6682
5K → 10K72817+711#6682#5971
10K → 15K22564+161#5971#5810
15K → 20K97108-11#5810#5821
20K → Half1528-13#5821#5834
Half → 25K58104-46#5834#5880
25K → 30K18360+123#5880#5757
30K → 20M9122+69#5757#5688
20M → 21M10013+87#5688#5601
21M → 35K872+85#5601#5516
35K → 23M1646+158#5516#5358
23M → 24M1098+101#5358#5257
24M → 40K1236+117#5257#5140
40K → 25.2M472+45#5140#5095
25.2M → Finish6323+40#5095#5055
TOTALS2090463+1627
📊

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