Boston Marathon logo
BOSTON MARATHON 2023

Karen Ong

Bib: 17356•F

TX

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 49%
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:29
Rank: #19720
Start → 5K
27:29 | 8:51/mi
10K· 6.21 mi
54:10
Rank: #19215 (+505)
5K → 10K
26:41 | 8:35/mi
15K· 9.32 mi
1:22:20
Rank: #19783 (-568)
10K → 15K
28:10 | 9:04/mi
20K· 12.43 mi
1:49:46
Rank: #19498 (+285)
15K → 20K
27:26 | 8:50/mi
Half· 13.11 mi
1:55:31
Rank: #19385 (+113)
20K → Half
5:45 | 8:26/mi
25K· 15.53 mi
2:16:19
Rank: #18969 (+416)
Half → 25K
20:48 | 8:35/mi
30K· 18.64 mi
2:43:32
Rank: #18418 (+551)
25K → 30K
27:13 | 8:46/mi
20M
2:55:08
Rank: #18080 (+338)
30K → 20M
11:36 | 8:32/mi
21M
3:03:57
Rank: #17735 (+345)
20M → 21M
8:49 | 8:49/mi
35K· 21.75 mi
3:09:36
Rank: #17452 (+283)
21M → 35K
5:39 | 7:33/mi
23M
3:19:32
Rank: #17017 (+435)
35K → 23M
9:56 | 7:56/mi
24M
3:27:13
Rank: #16712 (+305)
23M → 24M
7:41 | 7:41/mi
40K· 24.85 mi
3:34:07
Rank: #16488 (+224)
24M → 40K
6:54 | 8:04/mi
25.2M
3:37:05
Rank: #16378 (+110)
40K → 25.2M
2:58 | 8:36/mi
Finish· 26.22 mi
3:44:48
Rank: #16131 (+247)
25.2M → Finish
7:43 | 7:34/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 Half
Distance13.11 mi
Time1:55:31
Pace8:49 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:49:17
Pace8:20 /mi
📊Negative Split: 5.4% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:43:3327:298:5127:29
8:51
-
10K
6.21 mi12:10:1454:108:4326:41
8:35
-0:16
15K
9.32 mi12:38:241:22:208:5028:10
9:04
+0:29
20K
12.43 mi13:05:501:49:468:5027:26
8:50
-0:14
Half
13.11 mi13:11:351:55:318:495:45
8:26
-0:24
25K
15.53 mi13:32:232:16:198:4720:48
8:35
+0:09
30K
18.64 mi13:59:362:43:328:4627:13
8:46
+0:11
20M
20.00 mi14:11:122:55:088:4511:36
8:32
-0:14
21M
21.00 mi14:20:013:03:578:468:49
8:49
+0:17
35K
21.75 mi14:25:403:09:368:435:39
7:33
-1:16
23M
23.00 mi14:35:363:19:328:419:56
7:56
+0:23
24M
24.00 mi14:43:173:27:138:387:41
7:41
-0:15
40K
24.85 mi14:50:113:34:078:376:54
8:04
+0:23
25.2M
25.20 mi14:53:093:37:058:372:58
8:36
+0:32
Finish
26.22 mi15:00:523:44:488:357:43
7:34
-1:02

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

7:33 /mi

Average Pace

8:35 /mi

Slowest Pace

9:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

37:53

17% of race

Time at Steady Pace

1:43:50

46% of race

Time at Slower Pace

1:23:05

37% of race

Average Pace: 8:34 /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 mi11:43:3327:298:5127:29
8:51
#19720
10K
6.21 mi12:10:1454:108:4326:41
8:35
#19215
15K
9.32 mi12:38:241:22:208:5028:10
9:04
#19783
20K
12.43 mi13:05:501:49:468:5027:26
8:50
#19498
Half
13.11 mi13:11:351:55:318:495:45
8:26
#19385
25K
15.53 mi13:32:232:16:198:4720:48
8:35
#18969
30K
18.64 mi13:59:362:43:328:4627:13
8:46
#18418
20M
20.00 mi14:11:122:55:088:4511:36
8:32
#18080
21M
21.00 mi14:20:013:03:578:468:49
8:49
#17735
35K
21.75 mi14:25:403:09:368:435:39
7:33
#17452
23M
23.00 mi14:35:363:19:328:419:56
7:56
#17017
24M
24.00 mi14:43:173:27:138:387:41
7:41
#16712
40K
24.85 mi14:50:113:34:078:376:54
8:04
#16488
25.2M
25.20 mi14:53:093:37:058:372:58
8:36
#16378
Finish
26.22 mi15:00:523:44:488:357:43
7:34
#16131
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi197207644764420793(Top 78%)8116(Top 71%)8116(Top 166%)
10K6.21 mi3.10 mi19215+5057285+3597285+35918792(Top 71%)6953(Top 61%)6953(Top 142%)
15K9.32 mi3.11 mi19783-5687610-3257610-32520793(Top 78%)8116(Top 71%)8116(Top 166%)
20K12.43 mi3.11 mi19498+2857425+1857425+18518827(Top 71%)6980(Top 61%)6980(Top 143%)
Half13.11 mi0.68 mi19385+1137359+667359+6617321(Top 65%)6067(Top 53%)6067(Top 124%)
25K15.53 mi2.42 mi18969+4167102+2577102+25716696(Top 63%)5830(Top 51%)5830(Top 119%)
30K18.64 mi3.11 mi18418+5516816+2866816+28615837(Top 59%)5409(Top 47%)5409(Top 111%)
20M20.00 mi1.36 mi18080+3386634+1826634+18213886(Top 52%)4355(Top 38%)4355(Top 89%)
21M21.00 mi1.00 mi17735+3456430+2046430+20412408(Top 47%)3644(Top 32%)3644(Top 75%)
35K21.75 mi0.75 mi17452+2836276+1546276+1549010(Top 34%)1947(Top 17%)1947(Top 40%)
23M23.00 mi1.25 mi17017+4356032+2446032+2449344(Top 35%)2204(Top 19%)2204(Top 45%)
24M24.00 mi1.00 mi16712+3055868+1645868+1649039(Top 34%)2133(Top 19%)2133(Top 44%)
40K24.85 mi0.85 mi16488+2245766+1025766+10210582(Top 40%)2944(Top 26%)2944(Top 60%)
25.2M25.20 mi0.35 mi16378+1105708+585708+5810300(Top 39%)2880(Top 25%)2880(Top 59%)
Finish26.22 mi1.02 mi16131+2475569+1395569+1399147(Top 34%)2317(Top 20%)2317(Top 47%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 78%
×21stories
+97ft-345ft

Overall

20793

Females

8116

F18-39

8116

5K→10K

3.1 - 6.2 mi

Top 71%
×5stories
+79ft-138ft

Overall

18792

Females

6953

F18-39

6953

10K→15K

6.2 - 9.3 mi

Top 78%
×3stories
+67ft-78ft

Overall

20793

Females

8116

F18-39

8116

15K→20K

9.3 - 12.4 mi

Top 71%
×5stories
+106ft-86ft

Overall

18827

Females

6980

F18-39

6980

20K→Half

12.4 - 13.1 mi

Top 65%
×2stories
+19ft-37ft

Overall

17321

Females

6067

F18-39

6067

Half→25K

13.1 - 15.5 mi

Top 63%
×4stories
+66ft-88ft

Overall

16696

Females

5830

F18-39

5830

25K→30K

15.5 - 18.6 mi

Top 59%
×9stories
+181ft-148ft

Overall

15837

Females

5409

F18-39

5409

30K→20M

18.6 - 20.0 mi

Top 52%
×5stories
+64ft-50ft

Overall

13886

Females

4355

F18-39

4355

20M→21M

20.0 - 21.0 mi

Top 47%
×8stories
+106ft-24ft

Overall

12408

Females

3644

F18-39

3644

21M→35K

21.0 - 21.8 mi

Top 34%
×7stories
+17ft-86ft

Overall

9010

Females

1947

F18-39

1947

35K→23M

21.8 - 23.0 mi

Top 35%
×5stories
+23ft-63ft

Overall

9344

Females

2204

F18-39

2204

23M→24M

23.0 - 24.0 mi

Top 34%
×6stories
+12ft-82ft

Overall

9039

Females

2133

F18-39

2133

24M→40K

24.0 - 24.9 mi

Top 40%
×1story
+6ft-20ft

Overall

10582

Females

2944

F18-39

2944

40K→25.2M

24.9 - 25.2 mi

Top 39%
×1story
+13ft-16ft

Overall

10300

Females

2880

F18-39

2880

25.2M→Finish

25.2 - 26.2 mi

Top 34%
×2stories
+22ft-21ft

Overall

9147

Females

2317

F18-39

2317

Passing Analysis

Category:
Athletes Passed
4435
Passed By
846
Net Change
+3589
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19720
5K → 10K666161+505#19720#19215
10K → 15K45613-568#19215#19783
15K → 20K33550+285#19783#19498
20K → Half1152+113#19498#19385
Half → 25K4204+416#19385#18969
25K → 30K5609+551#18969#18418
30K → 20M3391+338#18418#18080
20M → 21M3450+345#18080#17735
21M → 35K2830+283#17735#17452
35K → 23M4361+435#17452#17017
23M → 24M3050+305#17017#16712
24M → 40K2251+224#16712#16488
40K → 25.2M1122+110#16488#16378
25.2M → Finish2492+247#16378#16131
TOTALS4435846+3589
📊

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