Boston Marathon logo
BOSTON MARATHON 2023

Jason Liu

Bib: 3970•M

NY

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 10%
Gender (Male)
#0 / 15176
Top 17%
Division (M18-39)
#0 / 5285
Top 36%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K· 3.11 mi
20:30
Rank: #2842
Start → 5K
20:30 | 6:36/mi
10K· 6.21 mi
40:57
Rank: #3082 (-240)
5K → 10K
20:27 | 6:35/mi
15K· 9.32 mi
1:01:22
Rank: #3074 (+8)
10K → 15K
20:25 | 6:34/mi
20K· 12.43 mi
1:21:52
Rank: #2992 (+82)
15K → 20K
20:30 | 6:36/mi
Half· 13.11 mi
1:26:18
Rank: #2970 (+22)
20K → Half
4:26 | 6:30/mi
25K· 15.53 mi
1:42:28
Rank: #2966 (+4)
Half → 25K
16:10 | 6:40/mi
30K· 18.64 mi
2:03:50
Rank: #2994 (-28)
25K → 30K
21:22 | 6:53/mi
20M
2:13:04
Rank: #2953 (+41)
30K → 20M
9:14 | 6:48/mi
21M
2:20:10
Rank: #2919 (+34)
20M → 21M
7:06 | 7:06/mi
35K· 21.75 mi
2:25:04
Rank: #2888 (+31)
21M → 35K
4:54 | 6:33/mi
23M
2:33:38
Rank: #2846 (+42)
35K → 23M
8:34 | 6:51/mi
24M
2:40:06
Rank: #2775 (+71)
23M → 24M
6:28 | 6:28/mi
40K· 24.85 mi
2:45:49
Rank: #2723 (+52)
24M → 40K
5:43 | 6:41/mi
25.2M
2:48:16
Rank: #2702 (+21)
40K → 25.2M
2:27 | 7:06/mi
Finish· 26.22 mi
2:54:43
Rank: #2629 (+73)
25.2M → Finish
6:27 | 6:20/mi

Course Map & Elevation

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
Time1:26:18
Pace6:35 /mi
2nd Half
Distance13.11 mi
Time1:28:25
Pace6:45 /mi
📊Positive Split: 2.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:1320:306:3620:30
6:36
-
10K
6.21 mi10:42:4040:576:3520:27
6:35
-0:01
15K
9.32 mi11:03:051:01:226:3520:25
6:34
-0:01
20K
12.43 mi11:23:351:21:526:3520:30
6:36
+0:02
Half
13.11 mi11:28:011:26:186:354:26
6:30
-0:06
25K
15.53 mi11:44:111:42:286:3616:10
6:40
+0:10
30K
18.64 mi12:05:332:03:506:3921:22
6:53
+0:13
20M
20.00 mi12:14:472:13:046:399:14
6:48
-0:05
21M
21.00 mi12:21:532:20:106:407:06
7:06
+0:18
35K
21.75 mi12:26:472:25:046:404:54
6:33
-0:33
23M
23.00 mi12:35:212:33:386:418:34
6:51
+0:18
24M
24.00 mi12:41:492:40:066:406:28
6:28
-0:23
40K
24.85 mi12:47:322:45:496:405:43
6:41
+0:13
25.2M
25.20 mi12:49:592:48:166:412:27
7:06
+0:25
Finish
26.22 mi12:56:262:54:436:406:27
6:20
-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

6:20 /mi

Average Pace

6:40 /mi

Slowest Pace

7:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

2:45:10

95% of race

Time at Steady Pace

9:33

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:40 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:22:1320:306:3620:30
6:36
#2842
10K
6.21 mi10:42:4040:576:3520:27
6:35
#3082
15K
9.32 mi11:03:051:01:226:3520:25
6:34
#3074
20K
12.43 mi11:23:351:21:526:3520:30
6:36
#2992
Half
13.11 mi11:28:011:26:186:354:26
6:30
#2970
25K
15.53 mi11:44:111:42:286:3616:10
6:40
#2966
30K
18.64 mi12:05:332:03:506:3921:22
6:53
#2994
20M
20.00 mi12:14:472:13:046:399:14
6:48
#2953
21M
21.00 mi12:21:532:20:106:407:06
7:06
#2919
35K
21.75 mi12:26:472:25:046:404:54
6:33
#2888
23M
23.00 mi12:35:212:33:386:418:34
6:51
#2846
24M
24.00 mi12:41:492:40:066:406:28
6:28
#2775
40K
24.85 mi12:47:322:45:496:405:43
6:41
#2723
25.2M
25.20 mi12:49:592:48:166:412:27
7:06
#2702
Finish
26.22 mi12:56:262:54:436:406:27
6:20
#2629
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2842270527053056(Top 11%)2914(Top 19%)2914(Top 55%)
10K6.21 mi3.10 mi3082-2402932-2272932-2273342(Top 13%)3179(Top 21%)3179(Top 60%)
15K9.32 mi3.11 mi3074+82929+32929+33056(Top 11%)2914(Top 19%)2914(Top 55%)
20K12.43 mi3.11 mi2992+822855+742855+742825(Top 11%)2699(Top 18%)2699(Top 51%)
Half13.11 mi0.68 mi2970+222836+192836+192767(Top 10%)2651(Top 17%)2651(Top 50%)
25K15.53 mi2.42 mi2966+42833+32833+33094(Top 12%)2949(Top 19%)2949(Top 56%)
30K18.64 mi3.11 mi2994-282856-232856-233492(Top 13%)3283(Top 22%)3283(Top 62%)
20M20.00 mi1.36 mi2953+412818+382818+382761(Top 10%)2608(Top 17%)2608(Top 49%)
21M21.00 mi1.00 mi2919+342785+332785+332617(Top 10%)2463(Top 16%)2463(Top 47%)
35K21.75 mi0.75 mi2888+312753+322753+322682(Top 10%)2525(Top 17%)2525(Top 48%)
23M23.00 mi1.25 mi2846+422712+412712+412881(Top 11%)2691(Top 18%)2691(Top 51%)
24M24.00 mi1.00 mi2775+712642+702642+701971(Top 7%)1852(Top 12%)1852(Top 35%)
40K24.85 mi0.85 mi2723+522593+492593+492281(Top 9%)2119(Top 14%)2119(Top 40%)
25.2M25.20 mi0.35 mi2702+212575+182575+182132(Top 8%)1988(Top 13%)1988(Top 38%)
Finish26.22 mi1.02 mi2629+732505+702505+701747(Top 7%)1643(Top 11%)1643(Top 31%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 11%
×21stories
+97ft-345ft

Overall

3056

Males

2914

M18-39

2914

5K→10K

3.1 - 6.2 mi

Top 13%
×5stories
+79ft-138ft

Overall

3342

Males

3179

M18-39

3179

10K→15K

6.2 - 9.3 mi

Top 11%
×3stories
+67ft-78ft

Overall

3056

Males

2914

M18-39

2914

15K→20K

9.3 - 12.4 mi

Top 11%
×5stories
+106ft-86ft

Overall

2825

Males

2699

M18-39

2699

20K→Half

12.4 - 13.1 mi

Top 10%
×2stories
+19ft-37ft

Overall

2767

Males

2651

M18-39

2651

Half→25K

13.1 - 15.5 mi

Top 12%
×4stories
+66ft-88ft

Overall

3094

Males

2949

M18-39

2949

25K→30K

15.5 - 18.6 mi

Top 13%
×9stories
+181ft-148ft

Overall

3492

Males

3283

M18-39

3283

30K→20M

18.6 - 20.0 mi

Top 10%
×5stories
+64ft-50ft

Overall

2761

Males

2608

M18-39

2608

20M→21M

20.0 - 21.0 mi

Top 10%
×8stories
+106ft-24ft

Overall

2617

Males

2463

M18-39

2463

21M→35K

21.0 - 21.8 mi

Top 10%
×7stories
+17ft-86ft

Overall

2682

Males

2525

M18-39

2525

35K→23M

21.8 - 23.0 mi

Top 11%
×5stories
+23ft-63ft

Overall

2881

Males

2691

M18-39

2691

23M→24M

23.0 - 24.0 mi

Top 7%
×6stories
+12ft-82ft

Overall

1971

Males

1852

M18-39

1852

24M→40K

24.0 - 24.9 mi

Top 9%
×1story
+6ft-20ft

Overall

2281

Males

2119

M18-39

2119

40K→25.2M

24.9 - 25.2 mi

Top 8%
×1story
+13ft-16ft

Overall

2132

Males

1988

M18-39

1988

25.2M→Finish

25.2 - 26.2 mi

Top 7%
×2stories
+22ft-21ft

Overall

1747

Males

1643

M18-39

1643

Passing Analysis

Category:
Athletes Passed
965
Passed By
752
Net Change
+213
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2842
5K → 10K74314-240#2842#3082
10K → 15K9486+8#3082#3074
15K → 20K12745+82#3074#2992
20K → Half3513+22#2992#2970
Half → 25K6763+4#2970#2966
25K → 30K77105-28#2966#2994
30K → 20M6625+41#2994#2953
20M → 21M5521+34#2953#2919
21M → 35K4615+31#2919#2888
35K → 23M7331+42#2888#2846
23M → 24M8211+71#2846#2775
24M → 40K6614+52#2775#2723
40K → 25.2M254+21#2723#2702
25.2M → Finish785+73#2702#2629
TOTALS965752+213
📊

Passing Visuals

Category:

📈Position Graph

Loading...

🎨Heatmap Timeline

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