Boston Marathon logo
BOSTON MARATHON 2025

Keiko Sasakawa

Bib: 24339•F

NE

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F60-64)
#0 / 624
Top 19%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:13
Rank: #21320
Start → 5K
27:13 | 8:46/mi
10K· 6.21 mi
54:19
Rank: #21121 (+199)
5K → 10K
27:06 | 8:43/mi
15K· 9.32 mi
1:21:34
Rank: #21006 (+115)
10K → 15K
27:15 | 8:46/mi
20K· 12.43 mi
1:49:00
Rank: #20777 (+229)
15K → 20K
27:26 | 8:50/mi
Half· 13.11 mi
1:54:56
Rank: #20763 (+14)
20K → Half
5:56 | 8:42/mi
25K· 15.53 mi
2:16:45
Rank: #20645 (+118)
Half → 25K
21:49 | 9:00/mi
30K· 18.64 mi
2:45:37
Rank: #20307 (+338)
25K → 30K
28:52 | 9:17/mi
20M
2:57:58
Rank: #20074 (+233)
30K → 20M
12:21 | 9:05/mi
21M
3:07:37
Rank: #19876 (+198)
20M → 21M
9:39 | 9:39/mi
35K· 21.75 mi
3:14:23
Rank: #19819 (+57)
21M → 35K
6:46 | 9:03/mi
23M
3:26:02
Rank: #19699 (+120)
35K → 23M
11:39 | 9:18/mi
24M
3:35:19
Rank: #19657 (+42)
23M → 24M
9:17 | 9:17/mi
40K· 24.85 mi
3:43:18
Rank: #19592 (+65)
24M → 40K
7:59 | 9:20/mi
25.2M
3:46:44
Rank: #19548 (+44)
40K → 25.2M
3:26 | 9:57/mi
Finish· 26.22 mi
3:56:05
Rank: #19569 (-21)
25.2M → Finish
9:21 | 9:11/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
Time1:54:56
Pace8:46 /mi
2nd Half
Distance13.11 mi
Time2:01:09
Pace9:15 /mi
📊Positive Split: 5.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:26:1527:138:4627:13
8:46
-
10K
6.21 mi11:53:2154:198:4427:06
8:43
-0:03
15K
9.32 mi12:20:361:21:348:4527:15
8:46
+0:03
20K
12.43 mi12:48:021:49:008:4627:26
8:50
+0:04
Half
13.11 mi12:53:581:54:568:465:56
8:42
-0:08
25K
15.53 mi13:15:472:16:458:4821:49
9:00
+0:18
30K
18.64 mi13:44:392:45:378:5328:52
9:17
+0:17
20M
20.00 mi13:57:002:57:588:5412:21
9:05
-0:12
21M
21.00 mi14:06:393:07:378:569:39
9:39
+0:34
35K
21.75 mi14:13:253:14:238:566:46
9:03
-0:36
23M
23.00 mi14:25:043:26:028:5711:39
9:18
+0:15
24M
24.00 mi14:34:213:35:198:589:17
9:17
-0:01
40K
24.85 mi14:42:203:43:188:597:59
9:20
+0:03
25.2M
25.20 mi14:45:463:46:449:003:26
9:57
+0:37
Finish
26.22 mi14:55:073:56:059:019:21
9:11
-0:46

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

8:42 /mi

Average Pace

9:01 /mi

Slowest Pace

9:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:43:00

94% of race

Time at Steady Pace

13:05

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 9:00 /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 mi11:26:1527:138:4627:13
8:46
#21320
10K
6.21 mi11:53:2154:198:4427:06
8:43
#21121
15K
9.32 mi12:20:361:21:348:4527:15
8:46
#21006
20K
12.43 mi12:48:021:49:008:4627:26
8:50
#20777
Half
13.11 mi12:53:581:54:568:465:56
8:42
#20763
25K
15.53 mi13:15:472:16:458:4821:49
9:00
#20645
30K
18.64 mi13:44:392:45:378:5328:52
9:17
#20307
20M
20.00 mi13:57:002:57:588:5412:21
9:05
#20074
21M
21.00 mi14:06:393:07:378:569:39
9:39
#19876
35K
21.75 mi14:13:253:14:238:566:46
9:03
#19819
23M
23.00 mi14:25:043:26:028:5711:39
9:18
#19699
24M
24.00 mi14:34:213:35:198:589:17
9:17
#19657
40K
24.85 mi14:42:203:43:188:597:59
9:20
#19592
25.2M
25.20 mi14:45:463:46:449:003:26
9:57
#19548
Finish
26.22 mi14:55:073:56:059:019:21
9:11
#19569
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF60-64Seg. OverallSeg. FemalesSeg. F60-64
5K3.11 mi3.11 mi213208248824820885(Top 74%)7934(Top 65%)7934(Top 1271%)
10K6.21 mi3.10 mi21121+1998117+1318117+13121009(Top 74%)8018(Top 66%)8018(Top 1285%)
15K9.32 mi3.11 mi21006+1158044+738044+7320885(Top 74%)7934(Top 65%)7934(Top 1271%)
20K12.43 mi3.11 mi20777+2297913+1317913+13120111(Top 71%)7542(Top 62%)7542(Top 1209%)
Half13.11 mi0.68 mi20763+147907+67907+620385(Top 72%)7686(Top 63%)7686(Top 1232%)
25K15.53 mi2.42 mi20645+1187846+617846+6119904(Top 70%)7479(Top 61%)7479(Top 1199%)
30K18.64 mi3.11 mi20307+3387704+1427704+14219081(Top 67%)7163(Top 59%)7163(Top 1148%)
20M20.00 mi1.36 mi20074+2337588+1167588+11617282(Top 61%)6306(Top 52%)6306(Top 1011%)
21M21.00 mi1.00 mi19876+1987499+897499+8916819(Top 59%)6168(Top 50%)6168(Top 988%)
35K21.75 mi0.75 mi19819+577485+147485+1418492(Top 65%)7192(Top 59%)7192(Top 1153%)
23M23.00 mi1.25 mi19699+1207450+357450+3517815(Top 63%)6903(Top 56%)6903(Top 1106%)
24M24.00 mi1.00 mi19657+427456-67456-618764(Top 66%)7421(Top 61%)7421(Top 1189%)
40K24.85 mi0.85 mi19592+657433+237433+2318042(Top 64%)7146(Top 58%)7146(Top 1145%)
25.2M25.20 mi0.35 mi19548+447424+97424+916907(Top 60%)6561(Top 54%)6561(Top 1051%)
Finish26.22 mi1.02 mi19569-217451-277451-2719860(Top 70%)8070(Top 66%)8070(Top 1293%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 74%
×21stories
+97ft-345ft

Overall

20885

Females

7934

F60-64

7934

5K→10K

3.1 - 6.2 mi

Top 74%
×5stories
+79ft-138ft

Overall

21009

Females

8018

F60-64

8018

10K→15K

6.2 - 9.3 mi

Top 74%
×3stories
+67ft-78ft

Overall

20885

Females

7934

F60-64

7934

15K→20K

9.3 - 12.4 mi

Top 71%
×5stories
+106ft-86ft

Overall

20111

Females

7542

F60-64

7542

20K→Half

12.4 - 13.1 mi

Top 72%
×2stories
+19ft-37ft

Overall

20385

Females

7686

F60-64

7686

Half→25K

13.1 - 15.5 mi

Top 70%
×4stories
+66ft-88ft

Overall

19904

Females

7479

F60-64

7479

25K→30K

15.5 - 18.6 mi

Top 67%
×9stories
+181ft-148ft

Overall

19081

Females

7163

F60-64

7163

30K→20M

18.6 - 20.0 mi

Top 61%
×5stories
+64ft-50ft

Overall

17282

Females

6306

F60-64

6306

20M→21M

20.0 - 21.0 mi

Top 59%
×8stories
+106ft-24ft

Overall

16819

Females

6168

F60-64

6168

21M→35K

21.0 - 21.8 mi

Top 65%
×7stories
+17ft-86ft

Overall

18492

Females

7192

F60-64

7192

35K→23M

21.8 - 23.0 mi

Top 63%
×5stories
+23ft-63ft

Overall

17815

Females

6903

F60-64

6903

23M→24M

23.0 - 24.0 mi

Top 66%
×6stories
+12ft-82ft

Overall

18764

Females

7421

F60-64

7421

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

18042

Females

7146

F60-64

7146

40K→25.2M

24.9 - 25.2 mi

Top 60%
×1story
+13ft-16ft

Overall

16907

Females

6561

F60-64

6561

25.2M→Finish

25.2 - 26.2 mi

Top 70%
×2stories
+22ft-21ft

Overall

19860

Females

8070

F60-64

8070

Passing Analysis

Category:
Athletes Passed
2549
Passed By
798
Net Change
+1751
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21320
5K → 10K392193+199#21320#21121
10K → 15K253138+115#21121#21006
15K → 20K29970+229#21006#20777
20K → Half3622+14#20777#20763
Half → 25K21294+118#20763#20645
25K → 30K39355+338#20645#20307
30K → 20M2407+233#20307#20074
20M → 21M2079+198#20074#19876
21M → 35K7518+57#19876#19819
35K → 23M16141+120#19819#19699
23M → 24M8543+42#19699#19657
24M → 40K9126+65#19657#19592
40K → 25.2M5511+44#19592#19548
25.2M → Finish5071-21#19548#19569
TOTALS2549798+1751
📊

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