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BOSTON MARATHON 2023

Shunli Xu

Bib: 29163•M

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

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:13/mi
25:31
↑ 97↓ 3451.5%
10K· 6.21 mi
8:04/mi
50:34
↑ 79↓ 1380.4%
15K· 9.32 mi
8:08/mi
1:15:50
↑ 67↓ 78
20K· 12.43 mi
8:27/mi
1:42:05
↑ 106↓ 860.1%
Half· 13.11 mi
8:20/mi
1:47:46
↑ 19↓ 370.5%
25K· 15.53 mi
8:45/mi
2:08:59
↑ 66↓ 880.2%
30K· 18.64 mi
9:02/mi
2:37:04
↑ 181↓ 1480.2%
20M
9:05/mi
2:49:24
↑ 64↓ 500.2%
21M
9:23/mi
2:58:47
↑ 106↓ 241.6%
35K· 21.75 mi
8:29/mi
3:05:08
↑ 17↓ 861.7%
23M
9:06/mi
3:16:32
↑ 23↓ 630.6%
24M
9:05/mi
3:25:37
↓ 821.3%
40K· 24.85 mi
9:06/mi
3:33:24
↓ 200.3%
25.2M
9:49/mi
3:36:47
↑ 13↓ 160.2%
Finish· 26.22 mi
8:39/mi
3:45:36
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:46
Pace8:13 /mi
2nd Half
Distance13.11 mi
Time1:57:50
Pace8:59 /mi
📊Positive Split: 9.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:43:1025:318:1325:31
8:13
-
10K
6.21 mi12:08:1350:348:0825:03
8:04
-0:09
15K
9.32 mi12:33:291:15:508:0825:16
8:08
+0:04
20K
12.43 mi12:59:441:42:058:1326:15
8:27
+0:19
Half
13.11 mi13:05:251:47:468:135:41
8:20
-0:07
25K
15.53 mi13:26:382:08:598:1821:13
8:45
+0:25
30K
18.64 mi13:54:432:37:048:2628:05
9:02
+0:17
20M
20.00 mi14:07:032:49:248:2812:20
9:05
+0:03
21M
21.00 mi14:16:262:58:478:319:23
9:23
+0:18
35K
21.75 mi14:22:473:05:088:316:21
8:29
-0:54
23M
23.00 mi14:34:113:16:328:3311:24
9:06
+0:37
24M
24.00 mi14:43:163:25:378:349:05
9:05
-0:01
40K
24.85 mi14:51:033:33:248:357:47
9:06
+0:01
25.2M
25.20 mi14:54:263:36:478:363:23
9:49
+0:43
Finish
26.22 mi15:03:153:45:368:378:49
8:39
-1:10

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

8:04 /mi

Average Pace

8:37 /mi

Slowest Pace

9:49 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:07

51% of race

Time at Steady Pace

30:02

13% of race

Time at Slower Pace

1:21:27

36% of race

Average Pace: 8:36 /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 mi11:43:1025:318:1325:31
8:13
#15546
10K
6.21 mi12:08:1350:348:0825:03
8:04
#15369
15K
9.32 mi12:33:291:15:508:0825:16
8:08
#15387
20K
12.43 mi12:59:441:42:058:1326:15
8:27
#15671
Half
13.11 mi13:05:251:47:468:135:41
8:20
#15714
25K
15.53 mi13:26:382:08:598:1821:13
8:45
#16051
30K
18.64 mi13:54:432:37:048:2628:05
9:02
#16330
20M
20.00 mi14:07:032:49:248:2812:20
9:05
#16340
21M
21.00 mi14:16:262:58:478:319:23
9:23
#16277
35K
21.75 mi14:22:473:05:088:316:21
8:29
#16226
23M
23.00 mi14:34:113:16:328:3311:24
9:06
#16232
24M
24.00 mi14:43:163:25:378:349:05
9:05
#16292
40K
24.85 mi14:51:033:33:248:357:47
9:06
#16290
25.2M
25.20 mi14:54:263:36:478:363:23
9:49
#16300
Finish
26.22 mi15:03:153:45:368:378:49
8:39
#16294
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi15546105291052915373(Top 58%)10464(Top 69%)10464(Top 198%)
10K6.21 mi3.10 mi15369+17710466+6310466+6315259(Top 57%)10409(Top 69%)10409(Top 197%)
15K9.32 mi3.11 mi15387-1810462+410462+415373(Top 58%)10464(Top 69%)10464(Top 198%)
20K12.43 mi3.11 mi15671-28410555-9310555-9316527(Top 62%)10846(Top 71%)10846(Top 205%)
Half13.11 mi0.68 mi15714-4310563-810563-816622(Top 62%)10924(Top 72%)10924(Top 207%)
25K15.53 mi2.42 mi16051-33710664-10110664-10117659(Top 66%)11261(Top 74%)11261(Top 213%)
30K18.64 mi3.11 mi16330-27910723-5910723-5917378(Top 65%)11065(Top 73%)11065(Top 209%)
20M20.00 mi1.36 mi16340-1010712+1110712+1116905(Top 64%)10787(Top 71%)10787(Top 204%)
21M21.00 mi1.00 mi16277+6310672+4010672+4015385(Top 58%)10092(Top 66%)10092(Top 191%)
35K21.75 mi0.75 mi16226+5110639+3310639+3315217(Top 57%)9963(Top 66%)9963(Top 189%)
23M23.00 mi1.25 mi16232-610638+110638+116552(Top 62%)10481(Top 69%)10481(Top 198%)
24M24.00 mi1.00 mi16292-6010643-510643-517579(Top 66%)10886(Top 72%)10886(Top 206%)
40K24.85 mi0.85 mi16290+210622+2110622+2116629(Top 62%)10412(Top 69%)10412(Top 197%)
25.2M25.20 mi0.35 mi16300-1010619+310619+316530(Top 62%)10342(Top 68%)10342(Top 196%)
Finish26.22 mi1.02 mi16294+610615+410615+416238(Top 61%)10259(Top 68%)10259(Top 194%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21story building
+97ft-345ft

Overall

15373

Males

10464

M18-39

10464

5K→10K

3.1 - 6.2 mi

Top 57%
×5story building
+79ft-138ft

Overall

15259

Males

10409

M18-39

10409

10K→15K

6.2 - 9.3 mi

Top 58%
×3story building
+67ft-78ft

Overall

15373

Males

10464

M18-39

10464

15K→20K

9.3 - 12.4 mi

Top 62%
×5story building
+106ft-86ft

Overall

16527

Males

10846

M18-39

10846

20K→Half

12.4 - 13.1 mi

Top 62%
×2story building
+19ft-37ft

Overall

16622

Males

10924

M18-39

10924

Half→25K

13.1 - 15.5 mi

Top 66%
×4story building
+66ft-88ft

Overall

17659

Males

11261

M18-39

11261

25K→30K

15.5 - 18.6 mi

Top 65%
×9story building
+181ft-148ft

Overall

17378

Males

11065

M18-39

11065

30K→20M

18.6 - 20.0 mi

Top 64%
×5story building
+64ft-50ft

Overall

16905

Males

10787

M18-39

10787

20M→21M

20.0 - 21.0 mi

Top 58%
×8story building
+106ft-24ft

Overall

15385

Males

10092

M18-39

10092

21M→35K

21.0 - 21.8 mi

Top 57%
×7story building
+17ft-86ft

Overall

15217

Males

9963

M18-39

9963

35K→23M

21.8 - 23.0 mi

Top 62%
×5story building
+23ft-63ft

Overall

16552

Males

10481

M18-39

10481

23M→24M

23.0 - 24.0 mi

Top 66%
×6story building
+12ft-82ft

Overall

17579

Males

10886

M18-39

10886

24M→40K

24.0 - 24.9 mi

Top 62%
×1story
+6ft-20ft

Overall

16629

Males

10412

M18-39

10412

40K→25.2M

24.9 - 25.2 mi

Top 62%
×1story
+13ft-16ft

Overall

16530

Males

10342

M18-39

10342

25.2M→Finish

25.2 - 26.2 mi

Top 61%
×2story building
+22ft-21ft

Overall

16238

Males

10259

M18-39

10259

Passing Analysis

Category:
Athletes Passed
1406
Passed By
2154
Net Change
-748
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15546
5K → 10K398221+177#15546#15369
10K → 15K172190-18#15369#15387
15K → 20K100384-284#15387#15671
20K → Half1457-43#15671#15714
Half → 25K65402-337#15714#16051
25K → 30K100379-279#16051#16330
30K → 20M8494-10#16330#16340
20M → 21M10744+63#16340#16277
21M → 35K7726+51#16277#16226
35K → 23M8086-6#16226#16232
23M → 24M52112-60#16232#16292
24M → 40K7068+2#16292#16290
40K → 25.2M2939-10#16290#16300
25.2M → Finish5852+6#16300#16294
TOTALS14062154-748
📊

Passing Visuals

Category:
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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing