Boston Marathon logo
BOSTON MARATHON 2023

Jiamin Liu

Bib: 8092•M

NY

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:47
Rank: #8353
Start → 5K
22:47 | 7:20/mi
10K· 6.21 mi
46:41
Rank: #10177 (-1824)
5K → 10K
23:54 | 7:42/mi
15K· 9.32 mi
1:12:54
Rank: #12899 (-2722)
10K → 15K
26:13 | 8:26/mi
20K· 12.43 mi
1:39:09
Rank: #13932 (-1033)
15K → 20K
26:15 | 8:27/mi
Half· 13.11 mi
1:44:37
Rank: #13953 (-21)
20K → Half
5:28 | 8:01/mi
25K· 15.53 mi
2:05:02
Rank: #14267 (-314)
Half → 25K
20:25 | 8:25/mi
30K· 18.64 mi
2:32:25
Rank: #14639 (-372)
25K → 30K
27:23 | 8:49/mi
20M
2:44:30
Rank: #14738 (-99)
30K → 20M
12:05 | 8:54/mi
21M
2:54:23
Rank: #14914 (-176)
20M → 21M
9:53 | 9:53/mi
35K· 21.75 mi
3:00:40
Rank: #14904 (+10)
21M → 35K
6:17 | 8:24/mi
23M
3:12:06
Rank: #15001 (-97)
35K → 23M
11:26 | 9:08/mi
24M
3:20:37
Rank: #14963 (+38)
23M → 24M
8:31 | 8:31/mi
40K· 24.85 mi
3:28:32
Rank: #15044 (-81)
24M → 40K
7:55 | 9:16/mi
25.2M
3:31:45
Rank: #15026 (+18)
40K → 25.2M
3:13 | 9:20/mi
Finish· 26.22 mi
3:40:05
Rank: #14977 (+49)
25.2M → Finish
8:20 | 8:11/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
Time1:44:37
Pace7:59 /mi
2nd Half
Distance13.11 mi
Time1:55:28
Pace8:48 /mi
📊Positive Split: 10.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:0522:477:2022:47
7:20
-
10K
6.21 mi11:11:5946:417:3123:54
7:42
+0:22
15K
9.32 mi11:38:121:12:547:4926:13
8:26
+0:44
20K
12.43 mi12:04:271:39:097:5926:15
8:27
+0:01
Half
13.11 mi12:09:551:44:377:595:28
8:01
-0:26
25K
15.53 mi12:30:202:05:028:0320:25
8:25
+0:24
30K
18.64 mi12:57:432:32:258:1127:23
8:49
+0:24
20M
20.00 mi13:09:482:44:308:1312:05
8:54
+0:05
21M
21.00 mi13:19:412:54:238:189:53
9:53
+0:59
35K
21.75 mi13:25:583:00:408:186:17
8:24
-1:29
23M
23.00 mi13:37:243:12:068:2111:26
9:08
+0:44
24M
24.00 mi13:45:553:20:378:228:31
8:31
-0:37
40K
24.85 mi13:53:503:28:328:237:55
9:16
+0:45
25.2M
25.20 mi13:57:033:31:458:243:13
9:20
+0:04
Finish
26.22 mi14:05:233:40:058:248:20
8:11
-1:09

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

7:20 /mi

Average Pace

8:24 /mi

Slowest Pace

9:53 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

52:09

24% of race

Time at Steady Pace

1:36:01

44% of race

Time at Slower Pace

1:11:55

33% of race

Average Pace: 8:24 /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 mi10:48:0522:477:2022:47
7:20
#8353
10K
6.21 mi11:11:5946:417:3123:54
7:42
#10177
15K
9.32 mi11:38:121:12:547:4926:13
8:26
#12899
20K
12.43 mi12:04:271:39:097:5926:15
8:27
#13932
Half
13.11 mi12:09:551:44:377:595:28
8:01
#13953
25K
15.53 mi12:30:202:05:028:0320:25
8:25
#14267
30K
18.64 mi12:57:432:32:258:1127:23
8:49
#14639
20M
20.00 mi13:09:482:44:308:1312:05
8:54
#14738
21M
21.00 mi13:19:412:54:238:189:53
9:53
#14914
35K
21.75 mi13:25:583:00:408:186:17
8:24
#14904
23M
23.00 mi13:37:243:12:068:2111:26
9:08
#15001
24M
24.00 mi13:45:553:20:378:228:31
8:31
#14963
40K
24.85 mi13:53:503:28:328:237:55
9:16
#15044
25.2M
25.20 mi13:57:033:31:458:243:13
9:20
#15026
Finish
26.22 mi14:05:233:40:058:248:20
8:11
#14977
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi83537197719717404(Top 65%)11221(Top 74%)11221(Top 212%)
10K6.21 mi3.10 mi10177-18248245-10488245-104812197(Top 46%)9190(Top 61%)9190(Top 174%)
15K9.32 mi3.11 mi12899-27229481-12369481-123617404(Top 65%)11221(Top 74%)11221(Top 212%)
20K12.43 mi3.11 mi13932-10339869-3889869-38816557(Top 62%)10853(Top 72%)10853(Top 205%)
Half13.11 mi0.68 mi13953-219876-79876-714593(Top 55%)10114(Top 67%)10114(Top 191%)
25K15.53 mi2.42 mi14267-3149981-1059981-10515731(Top 59%)10431(Top 69%)10431(Top 197%)
30K18.64 mi3.11 mi14639-37210100-11910100-11916180(Top 61%)10556(Top 70%)10556(Top 200%)
20M20.00 mi1.36 mi14738-9910118-1810118-1815999(Top 60%)10400(Top 69%)10400(Top 197%)
21M21.00 mi1.00 mi14914-17610157-3910157-3917624(Top 66%)11058(Top 73%)11058(Top 209%)
35K21.75 mi0.75 mi14904+1010134+2310134+2314785(Top 56%)9768(Top 64%)9768(Top 185%)
23M23.00 mi1.25 mi15001-9710145-1110145-1116728(Top 63%)10550(Top 70%)10550(Top 200%)
24M24.00 mi1.00 mi14963+3810109+3610109+3614625(Top 55%)9560(Top 63%)9560(Top 181%)
40K24.85 mi0.85 mi15044-8110120-1110120-1117388(Top 65%)10739(Top 71%)10739(Top 203%)
25.2M25.20 mi0.35 mi15026+1810102+1810102+1814455(Top 54%)9415(Top 62%)9415(Top 178%)
Finish26.22 mi1.02 mi14977+4910060+4210060+4213341(Top 50%)8928(Top 59%)8928(Top 169%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 65%
×21stories
+97ft-345ft

Overall

17404

Males

11221

M18-39

11221

5K→10K

3.1 - 6.2 mi

Top 46%
×5stories
+79ft-138ft

Overall

12197

Males

9190

M18-39

9190

10K→15K

6.2 - 9.3 mi

Top 65%
×3stories
+67ft-78ft

Overall

17404

Males

11221

M18-39

11221

15K→20K

9.3 - 12.4 mi

Top 62%
×5stories
+106ft-86ft

Overall

16557

Males

10853

M18-39

10853

20K→Half

12.4 - 13.1 mi

Top 55%
×2stories
+19ft-37ft

Overall

14593

Males

10114

M18-39

10114

Half→25K

13.1 - 15.5 mi

Top 59%
×4stories
+66ft-88ft

Overall

15731

Males

10431

M18-39

10431

25K→30K

15.5 - 18.6 mi

Top 61%
×9stories
+181ft-148ft

Overall

16180

Males

10556

M18-39

10556

30K→20M

18.6 - 20.0 mi

Top 60%
×5stories
+64ft-50ft

Overall

15999

Males

10400

M18-39

10400

20M→21M

20.0 - 21.0 mi

Top 66%
×8stories
+106ft-24ft

Overall

17624

Males

11058

M18-39

11058

21M→35K

21.0 - 21.8 mi

Top 56%
×7stories
+17ft-86ft

Overall

14785

Males

9768

M18-39

9768

35K→23M

21.8 - 23.0 mi

Top 63%
×5stories
+23ft-63ft

Overall

16728

Males

10550

M18-39

10550

23M→24M

23.0 - 24.0 mi

Top 55%
×6stories
+12ft-82ft

Overall

14625

Males

9560

M18-39

9560

24M→40K

24.0 - 24.9 mi

Top 65%
×1story
+6ft-20ft

Overall

17388

Males

10739

M18-39

10739

40K→25.2M

24.9 - 25.2 mi

Top 54%
×1story
+13ft-16ft

Overall

14455

Males

9415

M18-39

9415

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2stories
+22ft-21ft

Overall

13341

Males

8928

M18-39

8928

Passing Analysis

Category:
Athletes Passed
679
Passed By
7302
Net Change
-6624
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8353
5K → 10K101833-1824#8353#10177
10K → 15K32725-2722#10177#12899
15K → 20K341067-1033#12899#13932
20K → Half2748-21#13932#13953
Half → 25K60374-314#13953#14267
25K → 30K84456-372#14267#14639
30K → 20M55154-99#14639#14738
20M → 21M43219-176#14738#14914
21M → 35K5444+10#14914#14904
35K → 23M55152-97#14904#15001
23M → 24M7941+38#15001#14963
24M → 40K45126-81#14963#15044
40K → 25.2M4729+18#15044#15026
25.2M → Finish8334+49#15026#14977
TOTALS6797302-6624
📊

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