Boston Marathon logo
BOSTON MARATHON 2023

Xu Li

Bib: 13738•M

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M50-54)
#0 / 2052
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:37
Rank: #13441
Start → 5K
7:55/mi
24:37 split
10K· 6.21 mi
49:18
Rank: #13845 (-404)
5K → 10K
7:57/mi
24:41 split
15K· 9.32 mi
1:14:05
Rank: #13960 (-115)
10K → 15K
7:59/mi
24:47 split
20K· 12.43 mi
1:38:44
Rank: #13658 (+302)
15K → 20K
7:56/mi
24:39 split
Half· 13.11 mi
1:44:08
Rank: #13656 (+2)
20K → Half
7:55/mi
5:24 split
25K· 15.53 mi
2:03:31
Rank: #13473 (+183)
Half → 25K
8:00/mi
19:23 split
30K· 18.64 mi
2:29:17
Rank: #13360 (+113)
25K → 30K
8:18/mi
25:46 split
20M
2:41:38
Rank: #13682 (-322)
30K → 20M
9:05/mi
12:21 split
21M
2:51:44
Rank: #14048 (-366)
20M → 21M
10:06/mi
10:06 split
35K· 21.75 mi
2:58:27
Rank: #14210 (-162)
21M → 35K
8:59/mi
6:43 split
23M
3:10:07
Rank: #14441 (-231)
35K → 23M
9:19/mi
11:40 split
24M
3:18:55
Rank: #14497 (-56)
23M → 24M
8:48/mi
8:48 split
40K· 24.85 mi
3:26:27
Rank: #14512 (-15)
24M → 40K
8:49/mi
7:32 split
25.2M
3:29:38
Rank: #14489 (+23)
40K → 25.2M
9:14/mi
3:11 split
Finish· 26.22 mi
3:38:18
Rank: #14498 (-9)
25.2M → Finish
8:30/mi
8:40 split

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
Time1:44:08
Pace7:57 /mi
2nd Half
Distance13.11 mi
Time1:54:10
Pace8:43 /mi
📊Positive Split: 9.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:1624:377:5524:37
7:55
-
10K
6.21 mi11:17:5749:187:5624:41
7:57
+0:02
15K
9.32 mi11:42:441:14:057:5724:47
7:59
+0:02
20K
12.43 mi12:07:231:38:447:5724:39
7:56
-0:03
Half
13.11 mi12:12:471:44:087:575:24
7:55
-0:01
25K
15.53 mi12:32:102:03:317:5719:23
8:00
+0:05
30K
18.64 mi12:57:562:29:178:0025:46
8:18
+0:18
20M
20.00 mi13:10:172:41:388:0512:21
9:05
+0:47
21M
21.00 mi13:20:232:51:448:1110:06
10:06
+1:01
35K
21.75 mi13:27:062:58:278:126:43
8:59
-1:07
23M
23.00 mi13:38:463:10:078:1611:40
9:19
+0:20
24M
24.00 mi13:47:343:18:558:178:48
8:48
-0:31
40K
24.85 mi13:55:063:26:278:187:32
8:49
+0:01
25.2M
25.20 mi13:58:173:29:388:193:11
9:14
+0:25
Finish
26.22 mi14:06:573:38:188:208:40
8:30
-0:44

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

7:55 /mi

Average Pace

8:20 /mi

Slowest Pace

10:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:03:31

57% of race

Time at Steady Pace

50:46

23% of race

Time at Slower Pace

44:01

20% of race

Average Pace: 8:20 /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 mi10:53:1624:377:5524:37
7:55
#13441
10K
6.21 mi11:17:5749:187:5624:41
7:57
#13845
15K
9.32 mi11:42:441:14:057:5724:47
7:59
#13960
20K
12.43 mi12:07:231:38:447:5724:39
7:56
#13658
Half
13.11 mi12:12:471:44:087:575:24
7:55
#13656
25K
15.53 mi12:32:102:03:317:5719:23
8:00
#13473
30K
18.64 mi12:57:562:29:178:0025:46
8:18
#13360
20M
20.00 mi13:10:172:41:388:0512:21
9:05
#13682
21M
21.00 mi13:20:232:51:448:1110:06
10:06
#14048
35K
21.75 mi13:27:062:58:278:126:43
8:59
#14210
23M
23.00 mi13:38:463:10:078:1611:40
9:19
#14441
24M
24.00 mi13:47:343:18:558:178:48
8:48
#14497
40K
24.85 mi13:55:063:26:278:187:32
8:49
#14512
25.2M
25.20 mi13:58:173:29:388:193:11
9:14
#14489
Finish
26.22 mi14:06:573:38:188:208:40
8:30
#14498
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi134419739973914185(Top 53%)9975(Top 66%)9975(Top 486%)
10K6.21 mi3.10 mi13845-4049882-1439882-14314356(Top 54%)10063(Top 66%)10063(Top 490%)
15K9.32 mi3.11 mi13960-1159906-249906-2414185(Top 53%)9975(Top 66%)9975(Top 486%)
20K12.43 mi3.11 mi13658+3029756+1509756+15012897(Top 48%)9396(Top 62%)9396(Top 458%)
Half13.11 mi0.68 mi13656+29757-19757-113661(Top 51%)9771(Top 64%)9771(Top 476%)
25K15.53 mi2.42 mi13473+1839667+909667+9012693(Top 48%)9214(Top 61%)9214(Top 449%)
30K18.64 mi3.11 mi13360+1139584+839584+8312982(Top 49%)9224(Top 61%)9224(Top 450%)
20M20.00 mi1.36 mi13682-3229697-1139697-11316972(Top 64%)10804(Top 71%)10804(Top 527%)
21M21.00 mi1.00 mi14048-3669818-1219818-12118371(Top 69%)11369(Top 75%)11369(Top 554%)
35K21.75 mi0.75 mi14210-1629856-389856-3817784(Top 67%)11040(Top 73%)11040(Top 538%)
23M23.00 mi1.25 mi14441-2319926-709926-7017580(Top 66%)10935(Top 72%)10935(Top 533%)
24M24.00 mi1.00 mi14497-569927-19927-116166(Top 61%)10244(Top 68%)10244(Top 499%)
40K24.85 mi0.85 mi14512-159910+179910+1715114(Top 57%)9735(Top 64%)9735(Top 474%)
25.2M25.20 mi0.35 mi14489+239890+209890+2013753(Top 52%)9121(Top 60%)9121(Top 444%)
Finish26.22 mi1.02 mi14498-99883+79883+715432(Top 58%)9917(Top 65%)9917(Top 483%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 53%
×21story building
+97ft-345ft

Overall

14185

Males

9975

M50-54

9975

5K→10K

3.1 - 6.2 mi

Top 54%
×5story building
+79ft-138ft

Overall

14356

Males

10063

M50-54

10063

10K→15K

6.2 - 9.3 mi

Top 53%
×3story building
+67ft-78ft

Overall

14185

Males

9975

M50-54

9975

15K→20K

9.3 - 12.4 mi

Top 48%
×5story building
+106ft-86ft

Overall

12897

Males

9396

M50-54

9396

20K→Half

12.4 - 13.1 mi

Top 51%
×2story building
+19ft-37ft

Overall

13661

Males

9771

M50-54

9771

Half→25K

13.1 - 15.5 mi

Top 48%
×4story building
+66ft-88ft

Overall

12693

Males

9214

M50-54

9214

25K→30K

15.5 - 18.6 mi

Top 49%
×9story building
+181ft-148ft

Overall

12982

Males

9224

M50-54

9224

30K→20M

18.6 - 20.0 mi

Top 64%
×5story building
+64ft-50ft

Overall

16972

Males

10804

M50-54

10804

20M→21M

20.0 - 21.0 mi

Top 69%
×8story building
+106ft-24ft

Overall

18371

Males

11369

M50-54

11369

21M→35K

21.0 - 21.8 mi

Top 67%
×7story building
+17ft-86ft

Overall

17784

Males

11040

M50-54

11040

35K→23M

21.8 - 23.0 mi

Top 66%
×5story building
+23ft-63ft

Overall

17580

Males

10935

M50-54

10935

23M→24M

23.0 - 24.0 mi

Top 61%
×6story building
+12ft-82ft

Overall

16166

Males

10244

M50-54

10244

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

15114

Males

9735

M50-54

9735

40K→25.2M

24.9 - 25.2 mi

Top 52%
×1story
+13ft-16ft

Overall

13753

Males

9121

M50-54

9121

25.2M→Finish

25.2 - 26.2 mi

Top 58%
×2story building
+22ft-21ft

Overall

15432

Males

9917

M50-54

9917

Passing Analysis

Category:
Athletes Passed
1410
Passed By
2467
Net Change
-1057
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13441
5K → 10K137541-404#13441#13845
10K → 15K136251-115#13845#13960
15K → 20K34543+302#13960#13658
20K → Half2624+2#13658#13656
Half → 25K22542+183#13656#13473
25K → 30K245132+113#13473#13360
30K → 20M26348-322#13360#13682
20M → 21M19385-366#13682#14048
21M → 35K14176-162#14048#14210
35K → 23M30261-231#14210#14441
23M → 24M60116-56#14441#14497
24M → 40K5267-15#14497#14512
40K → 25.2M3512+23#14512#14489
25.2M → Finish6069-9#14489#14498
TOTALS14102467-1057
📊

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing