Boston Marathon logo
BOSTON MARATHON 2023

Sumie Yamakawa

Bib: 14298•F

ON

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 40%
Gender (Female)
#0 / 11423
Top 21%
Masters (Masters Women)
#0 / 6539
Top 9%
Division (F45-49)
#0 / 1817
Top 9%
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
7:51/mi
24:24
↑ 97↓ 3451.5%
10K· 6.21 mi
7:42/mi
48:19
↑ 79↓ 1380.4%
15K· 9.32 mi
7:35/mi
1:11:54
↑ 67↓ 78
20K· 12.43 mi
7:37/mi
1:35:34
↑ 106↓ 860.1%
Half· 13.11 mi
7:33/mi
1:40:43
↑ 19↓ 370.5%
25K· 15.53 mi
7:36/mi
1:59:09
↑ 66↓ 880.2%
30K· 18.64 mi
7:47/mi
2:23:21
↑ 181↓ 1480.2%
20M
8:03/mi
2:34:18
↑ 64↓ 500.2%
21M
8:37/mi
2:42:55
↑ 106↓ 241.6%
35K· 21.75 mi
7:26/mi
2:48:29
↑ 17↓ 861.7%
23M
8:02/mi
2:58:33
↑ 23↓ 630.6%
24M
7:48/mi
3:06:21
↓ 821.3%
40K· 24.85 mi
8:05/mi
3:13:16
↓ 200.3%
25.2M
9:02/mi
3:16:23
↑ 13↓ 160.2%
Finish· 26.22 mi
8:26/mi
3:24:59
↑ 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
Time1:40:43
Pace7:41 /mi
2nd Half
Distance13.11 mi
Time1:44:16
Pace7:57 /mi
📊Positive Split: 3.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:1924:247:5124:24
7:51
-
10K
6.21 mi11:17:1448:197:4723:55
7:42
-0:09
15K
9.32 mi11:40:491:11:547:4323:35
7:35
-0:07
20K
12.43 mi12:04:291:35:347:4123:40
7:37
+0:02
Half
13.11 mi12:09:381:40:437:415:09
7:33
-0:04
25K
15.53 mi12:28:041:59:097:4018:26
7:36
+0:03
30K
18.64 mi12:52:162:23:217:4124:12
7:47
+0:11
20M
20.00 mi13:03:132:34:187:4310:57
8:03
+0:16
21M
21.00 mi13:11:502:42:557:458:37
8:37
+0:34
35K
21.75 mi13:17:242:48:297:455:34
7:26
-1:11
23M
23.00 mi13:27:282:58:337:4610:04
8:02
+0:36
24M
24.00 mi13:35:163:06:217:467:48
7:48
-0:14
40K
24.85 mi13:42:113:13:167:476:55
8:05
+0:17
25.2M
25.20 mi13:45:183:16:237:483:07
9:02
+0:57
Finish
26.22 mi13:53:543:24:597:498:36
8:26
-0:36

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

7:26 /mi

Average Pace

7:49 /mi

Slowest Pace

9:02 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

34:18

17% of race

Time at Steady Pace

2:02:25

60% of race

Time at Slower Pace

48:16

24% of race

Average Pace: 7:49 /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 mi10:53:1924:247:5124:24
7:51
#12875
10K
6.21 mi11:17:1448:197:4723:55
7:42
#12503
15K
9.32 mi11:40:491:11:547:4323:35
7:35
#11906
20K
12.43 mi12:04:291:35:347:4123:40
7:37
#11445
Half
13.11 mi12:09:381:40:437:415:09
7:33
#11389
25K
15.53 mi12:28:041:59:097:4018:26
7:36
#11061
30K
18.64 mi12:52:162:23:217:4124:12
7:47
#10685
20M
20.00 mi13:03:132:34:187:4310:57
8:03
#10687
21M
21.00 mi13:11:502:42:557:458:37
8:37
#10678
35K
21.75 mi13:17:242:48:297:455:34
7:26
#10547
23M
23.00 mi13:27:282:58:337:4610:04
8:02
#10505
24M
24.00 mi13:35:163:06:217:467:48
7:48
#10462
40K
24.85 mi13:42:113:13:167:476:55
8:05
#10450
25.2M
25.20 mi13:45:183:16:237:483:07
9:02
#10486
Finish
26.22 mi13:53:543:24:597:498:36
8:26
#10643
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi128753366336610946(Top 41%)2311(Top 20%)2311(Top 127%)
10K6.21 mi3.10 mi12503+3723156+2103156+21012227(Top 46%)2996(Top 26%)2996(Top 165%)
15K9.32 mi3.11 mi11906+5972838+3182838+31810946(Top 41%)2311(Top 20%)2311(Top 127%)
20K12.43 mi3.11 mi11445+4612584+2542584+25410231(Top 38%)2016(Top 18%)2016(Top 111%)
Half13.11 mi0.68 mi11389+562558+262558+2610683(Top 40%)2221(Top 19%)2221(Top 122%)
25K15.53 mi2.42 mi11061+3282387+1712387+1719586(Top 36%)1824(Top 16%)1824(Top 100%)
30K18.64 mi3.11 mi10685+3762248+1392248+1399299(Top 35%)1840(Top 16%)1840(Top 101%)
20M20.00 mi1.36 mi10687-22277-292277-2910722(Top 40%)2590(Top 23%)2590(Top 143%)
21M21.00 mi1.00 mi10678+92292-152292-1511165(Top 42%)2947(Top 26%)2947(Top 162%)
35K21.75 mi0.75 mi10547+1312245+472245+478164(Top 31%)1582(Top 14%)1582(Top 87%)
23M23.00 mi1.25 mi10505+422249-42249-410060(Top 38%)2537(Top 22%)2537(Top 140%)
24M24.00 mi1.00 mi10462+432262-132262-139824(Top 37%)2509(Top 22%)2509(Top 138%)
40K24.85 mi0.85 mi10450+122285-232285-2310656(Top 40%)2960(Top 26%)2960(Top 163%)
25.2M25.20 mi0.35 mi10486-362312-272312-2712749(Top 48%)4082(Top 36%)4082(Top 225%)
Finish26.22 mi1.02 mi10643-1572410-982410-9815010(Top 56%)5245(Top 46%)5245(Top 289%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 41%
×21story building
+97ft-345ft

Overall

10946

Females

2311

F45-49

2311

5K→10K

3.1 - 6.2 mi

Top 46%
×5story building
+79ft-138ft

Overall

12227

Females

2996

F45-49

2996

10K→15K

6.2 - 9.3 mi

Top 41%
×3story building
+67ft-78ft

Overall

10946

Females

2311

F45-49

2311

15K→20K

9.3 - 12.4 mi

Top 38%
×5story building
+106ft-86ft

Overall

10231

Females

2016

F45-49

2016

20K→Half

12.4 - 13.1 mi

Top 40%
×2story building
+19ft-37ft

Overall

10683

Females

2221

F45-49

2221

Half→25K

13.1 - 15.5 mi

Top 36%
×4story building
+66ft-88ft

Overall

9586

Females

1824

F45-49

1824

25K→30K

15.5 - 18.6 mi

Top 35%
×9story building
+181ft-148ft

Overall

9299

Females

1840

F45-49

1840

30K→20M

18.6 - 20.0 mi

Top 40%
×5story building
+64ft-50ft

Overall

10722

Females

2590

F45-49

2590

20M→21M

20.0 - 21.0 mi

Top 42%
×8story building
+106ft-24ft

Overall

11165

Females

2947

F45-49

2947

21M→35K

21.0 - 21.8 mi

Top 31%
×7story building
+17ft-86ft

Overall

8164

Females

1582

F45-49

1582

35K→23M

21.8 - 23.0 mi

Top 38%
×5story building
+23ft-63ft

Overall

10060

Females

2537

F45-49

2537

23M→24M

23.0 - 24.0 mi

Top 37%
×6story building
+12ft-82ft

Overall

9824

Females

2509

F45-49

2509

24M→40K

24.0 - 24.9 mi

Top 40%
×1story
+6ft-20ft

Overall

10656

Females

2960

F45-49

2960

40K→25.2M

24.9 - 25.2 mi

Top 48%
×1story
+13ft-16ft

Overall

12749

Females

4082

F45-49

4082

25.2M→Finish

25.2 - 26.2 mi

Top 56%
×2story building
+22ft-21ft

Overall

15010

Females

5245

F45-49

5245

Passing Analysis

Category:
Athletes Passed
3047*
Passed By
815
Net Change
+2232
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12875
5K → 10K537165+372#12875#12503
10K → 15K62225+597#12503#11906
15K → 20K48120+461#11906#11445
20K → Half6610+56#11445#11389
Half → 25K3368+328#11389#11061
25K → 30K40529+376#11061#10685
30K → 20M77*79-2#10685#10687
20M → 21M7263+9#10687#10678
21M → 35K1332+131#10678#10547
35K → 23M9654+42#10547#10505
23M → 24M9552+43#10505#10462
24M → 40K7260+12#10462#10450
40K → 25.2M2056-36#10450#10486
25.2M → Finish35192-157#10486#10643
TOTALS3047*815+2232

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

📊

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