Boston Marathon logo
BOSTON MARATHON 2023

Alan Sato

Bib: 15502•M

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 44%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 49%
Division (M50-54)
#0 / 2052
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ 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
7:47/mi
24:10
↑ 97↓ 3451.5%
10K· 6.21 mi
7:50/mi
48:29
↑ 79↓ 1380.4%
15K· 9.32 mi
7:51/mi
1:12:53
↑ 67↓ 78
20K· 12.43 mi
7:56/mi
1:37:31
↑ 106↓ 860.1%
Half· 13.11 mi
7:43/mi
1:42:47
↑ 19↓ 370.5%
25K· 15.53 mi
7:56/mi
2:02:02
↑ 66↓ 880.2%
30K· 18.64 mi
8:25/mi
2:28:10
↑ 181↓ 1480.2%
20M
8:25/mi
2:39:36
↑ 64↓ 500.2%
21M
8:38/mi
2:48:14
↑ 106↓ 241.6%
35K· 21.75 mi
7:32/mi
2:53:52
↑ 17↓ 861.7%
23M
7:50/mi
3:03:41
↑ 23↓ 630.6%
24M
7:38/mi
3:11:19
↓ 821.3%
40K· 24.85 mi
7:45/mi
3:17:57
↓ 200.3%
25.2M
8:22/mi
3:20:50
↑ 13↓ 160.2%
Finish· 26.22 mi
7:27/mi
3:28:26
↑ 22↓ 21

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
Time1:42:47
Pace7:50 /mi
2nd Half
Distance13.11 mi
Time1:45:39
Pace8:04 /mi
📊Positive Split: 2.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:0724:107:4724:10
7:47
-
10K
6.21 mi11:18:2648:297:4824:19
7:50
+0:03
15K
9.32 mi11:42:501:12:537:4924:24
7:51
+0:01
20K
12.43 mi12:07:281:37:317:5124:38
7:56
+0:05
Half
13.11 mi12:12:441:42:477:505:16
7:43
-0:13
25K
15.53 mi12:31:592:02:027:5119:15
7:56
+0:13
30K
18.64 mi12:58:072:28:107:5726:08
8:25
+0:29
20M
20.00 mi13:09:332:39:367:5911:26
8:25
0:00
21M
21.00 mi13:18:112:48:148:018:38
8:38
+0:13
35K
21.75 mi13:23:492:53:528:005:38
7:32
-1:06
23M
23.00 mi13:33:383:03:417:599:49
7:50
+0:18
24M
24.00 mi13:41:163:11:197:587:38
7:38
-0:12
40K
24.85 mi13:47:543:17:577:586:38
7:45
+0:07
25.2M
25.20 mi13:50:473:20:507:582:53
8:22
+0:37
Finish
26.22 mi13:58:233:28:267:577:36
7:27
-0:55

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

7:27 /mi

Average Pace

7:57 /mi

Slowest Pace

8:38 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:39:21

76% of race

Time at Steady Pace

49:05

24% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:57 /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 mi10:54:0724:107:4724:10
7:47
#12147
10K
6.21 mi11:18:2648:297:4824:19
7:50
#12717
15K
9.32 mi11:42:501:12:537:4924:24
7:51
#12865
20K
12.43 mi12:07:281:37:317:5124:38
7:56
#12816
Half
13.11 mi12:12:441:42:477:505:16
7:43
#12776
25K
15.53 mi12:31:592:02:027:5119:15
7:56
#12647
30K
18.64 mi12:58:072:28:107:5726:08
8:25
#12891
20M
20.00 mi13:09:332:39:367:5911:26
8:25
#12880
21M
21.00 mi13:18:112:48:148:018:38
8:38
#12731
35K
21.75 mi13:23:492:53:528:005:38
7:32
#12586
23M
23.00 mi13:33:383:03:417:599:49
7:50
#12335
24M
24.00 mi13:41:163:11:197:587:38
7:38
#12174
40K
24.85 mi13:47:543:17:577:586:38
7:45
#11998
25.2M
25.20 mi13:50:473:20:507:582:53
8:22
#11939
Finish
26.22 mi13:58:233:28:267:577:36
7:27
#11765
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi121479179917913136(Top 49%)9554(Top 63%)9554(Top 466%)
10K6.21 mi3.10 mi12717-5709430-2519430-25113346(Top 50%)9696(Top 64%)9696(Top 473%)
15K9.32 mi3.11 mi12865-1489471-419471-4113136(Top 49%)9554(Top 63%)9554(Top 466%)
20K12.43 mi3.11 mi12816+499426+459426+4512846(Top 48%)9361(Top 62%)9361(Top 456%)
Half13.11 mi0.68 mi12776+409407+199407+1911987(Top 45%)9064(Top 60%)9064(Top 442%)
25K15.53 mi2.42 mi12647+1299327+809327+8012201(Top 46%)8991(Top 59%)8991(Top 438%)
30K18.64 mi3.11 mi12891-2449390-639390-6313779(Top 52%)9559(Top 63%)9559(Top 466%)
20M20.00 mi1.36 mi12880+119363+279363+2713068(Top 49%)9148(Top 60%)9148(Top 446%)
21M21.00 mi1.00 mi12731+1499282+819282+8111243(Top 42%)8233(Top 54%)8233(Top 401%)
35K21.75 mi0.75 mi12586+1459208+749208+748736(Top 33%)6953(Top 46%)6953(Top 339%)
23M23.00 mi1.25 mi12335+2519069+1399069+1398684(Top 33%)6810(Top 45%)6810(Top 332%)
24M24.00 mi1.00 mi12174+1618982+878982+878634(Top 32%)6701(Top 44%)6701(Top 327%)
40K24.85 mi0.85 mi11998+1768882+1008882+1008391(Top 32%)6497(Top 43%)6497(Top 317%)
25.2M25.20 mi0.35 mi11939+598854+288854+288666(Top 33%)6567(Top 43%)6567(Top 320%)
Finish26.22 mi1.02 mi11765+1748756+988756+988238(Top 31%)6311(Top 42%)6311(Top 308%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 49%
×21story building
+97ft-345ft

Overall

13136

Males

9554

M50-54

9554

5K→10K

3.1 - 6.2 mi

Top 50%
×5story building
+79ft-138ft

Overall

13346

Males

9696

M50-54

9696

10K→15K

6.2 - 9.3 mi

Top 49%
×3story building
+67ft-78ft

Overall

13136

Males

9554

M50-54

9554

15K→20K

9.3 - 12.4 mi

Top 48%
×5story building
+106ft-86ft

Overall

12846

Males

9361

M50-54

9361

20K→Half

12.4 - 13.1 mi

Top 45%
×2story building
+19ft-37ft

Overall

11987

Males

9064

M50-54

9064

Half→25K

13.1 - 15.5 mi

Top 46%
×4story building
+66ft-88ft

Overall

12201

Males

8991

M50-54

8991

25K→30K

15.5 - 18.6 mi

Top 52%
×9story building
+181ft-148ft

Overall

13779

Males

9559

M50-54

9559

30K→20M

18.6 - 20.0 mi

Top 49%
×5story building
+64ft-50ft

Overall

13068

Males

9148

M50-54

9148

20M→21M

20.0 - 21.0 mi

Top 42%
×8story building
+106ft-24ft

Overall

11243

Males

8233

M50-54

8233

21M→35K

21.0 - 21.8 mi

Top 33%
×7story building
+17ft-86ft

Overall

8736

Males

6953

M50-54

6953

35K→23M

21.8 - 23.0 mi

Top 33%
×5story building
+23ft-63ft

Overall

8684

Males

6810

M50-54

6810

23M→24M

23.0 - 24.0 mi

Top 32%
×6story building
+12ft-82ft

Overall

8634

Males

6701

M50-54

6701

24M→40K

24.0 - 24.9 mi

Top 32%
×1story
+6ft-20ft

Overall

8391

Males

6497

M50-54

6497

40K→25.2M

24.9 - 25.2 mi

Top 33%
×1story
+13ft-16ft

Overall

8666

Males

6567

M50-54

6567

25.2M→Finish

25.2 - 26.2 mi

Top 31%
×2story building
+22ft-21ft

Overall

8238

Males

6311

M50-54

6311

Passing Analysis

Category:
Athletes Passed
2128
Passed By
1746
Net Change
+382
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12147
5K → 10K117687-570#12147#12717
10K → 15K144292-148#12717#12865
15K → 20K210161+49#12865#12816
20K → Half5919+40#12816#12776
Half → 25K20374+129#12776#12647
25K → 30K111355-244#12647#12891
30K → 20M10392+11#12891#12880
20M → 21M17728+149#12880#12731
21M → 35K1472+145#12731#12586
35K → 23M2598+251#12586#12335
23M → 24M1665+161#12335#12174
24M → 40K1826+176#12174#11998
40K → 25.2M656+59#11998#11939
25.2M → Finish18511+174#11939#11765
TOTALS21281746+382
📊

Passing Visuals

Category:
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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing