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BOSTON MARATHON 2026

Sidong Chen

Bib: 18215•M

NC

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0:00
0:00
/ mi
Masters
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Overall
#0 / 29021
Gender (Male)
#0 / 16340
Masters (Masters Men)
#0 / 10617
Age Group (M55-59)
#0 / 1491
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
25:00
3.11 mi
Rank: #17257
Start → 5K
25:00 | 8:03/mi
10K
50:05
6.21 mi
Rank: #17508 (-251)
5K → 10K
25:05 | 8:05/mi
15K
1:15:26
9.32 mi
Rank: #17717 (-209)
10K → 15K
25:21 | 8:10/mi
20K
1:40:52
12.43 mi
Rank: #17624 (+93)
15K → 20K
25:26 | 8:12/mi
HALF
1:46:20
13.11 mi
Rank: #17592 (+32)
20K → HALF
5:28 | 8:02/mi
25K
2:06:18
15.53 mi
Rank: #17494 (+98)
HALF → 25K
19:58 | 8:14/mi
30K
2:32:21
18.64 mi
Rank: #17201 (+293)
25K → 30K
26:03 | 8:24/mi
20M
2:44:04
20.00 mi
Rank: #17159 (+42)
30K → 20M
11:43 | 8:38/mi
21M
2:53:25
21.00 mi
Rank: #17188 (-29)
20M → 21M
9:21 | 9:21/mi
35K
2:59:44
21.75 mi
Rank: #17166 (+22)
21M → 35K
6:19 | 8:27/mi
23M
3:10:55
23.00 mi
Rank: #17215 (-49)
35K → 23M
11:11 | 8:57/mi
24M
3:19:30
24.00 mi
Rank: #17199 (+16)
23M → 24M
8:35 | 8:35/mi
40K
3:27:04
24.85 mi
Rank: #17191 (+8)
24M → 40K
7:34 | 8:51/mi
25.2M
3:30:34
25.20 mi
Rank: #17237 (-46)
40K → 25.2M
3:30 | 10:09/mi
FINISH
3:39:22
26.22 mi
Rank: #17318 (-81)
25.2M → FINISH
8:48 | 8:39/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:46:20
Pace8:07 /mi
2nd Half
Distance13.11 mi
Time1:53:02
Pace8:38 /mi
📊Positive Split: 6.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:07:0325:008:0325:00
8:03
-
10K
6.21 mi11:32:0850:058:0425:05
8:05
+0:02
15K
9.32 mi11:57:291:15:268:0625:21
8:10
+0:05
20K
12.43 mi12:22:551:40:528:0725:26
8:12
+0:02
HALF
13.11 mi12:28:231:46:208:075:28
8:02
-0:10
25K
15.53 mi12:48:212:06:188:0819:58
8:14
+0:12
30K
18.64 mi13:14:242:32:218:1126:03
8:24
+0:10
20M
20.00 mi13:26:072:44:048:1311:43
8:38
+0:14
21M
21.00 mi13:35:282:53:258:169:21
9:21
+0:43
35K
21.75 mi13:41:472:59:448:166:19
8:27
-0:54
23M
23.00 mi13:52:583:10:558:1911:11
8:57
+0:30
24M
24.00 mi14:01:333:19:308:198:35
8:35
-0:22
40K
24.85 mi14:09:073:27:048:207:34
8:51
+0:16
25.2M
25.20 mi14:12:373:30:348:223:30
10:09
+1:18
FINISH
26.22 mi14:21:253:39:228:238:48
8:39
-1:30

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

8:02 /mi

Average Pace

8:22 /mi

Slowest Pace

10:09 /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

1:20:54

37% of race

Time at Steady Pace

1:46:52

49% of race

Time at Slower Pace

31:36

14% of race

Average Pace: 8:22 /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 mi11:07:0325:008:0325:00
8:03
#17257
10K
6.21 mi11:32:0850:058:0425:05
8:05
#17508
15K
9.32 mi11:57:291:15:268:0625:21
8:10
#17717
20K
12.43 mi12:22:551:40:528:0725:26
8:12
#17624
HALF
13.11 mi12:28:231:46:208:075:28
8:02
#17592
25K
15.53 mi12:48:212:06:188:0819:58
8:14
#17494
30K
18.64 mi13:14:242:32:218:1126:03
8:24
#17201
20M
20.00 mi13:26:072:44:048:1311:43
8:38
#17159
21M
21.00 mi13:35:282:53:258:169:21
9:21
#17188
35K
21.75 mi13:41:472:59:448:166:19
8:27
#17166
23M
23.00 mi13:52:583:10:558:1911:11
8:57
#17215
24M
24.00 mi14:01:333:19:308:198:35
8:35
#17199
40K
24.85 mi14:09:073:27:048:207:34
8:51
#17191
25.2M
25.20 mi14:12:373:30:348:223:30
10:09
#17237
FINISH
26.22 mi14:21:253:39:228:238:48
8:39
#17318
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi17257111251112518070(Top 62%)11483(Top 70%)11483(Top 770%)
10K6.21 mi3.10 mi17508-25111220-9511220-9517778(Top 61%)11335(Top 69%)11335(Top 760%)
15K9.32 mi3.11 mi17717-20911309-8911309-8918070(Top 62%)11483(Top 70%)11483(Top 770%)
20K12.43 mi3.11 mi17624+9311264+4511264+4517402(Top 60%)11170(Top 68%)11170(Top 749%)
HALF13.11 mi0.68 mi17592+3211255+911255+917215(Top 59%)11110(Top 68%)11110(Top 745%)
25K15.53 mi2.42 mi17494+9811208+4711208+4716998(Top 59%)10946(Top 67%)10946(Top 734%)
30K18.64 mi3.11 mi17201+29311052+15611052+15616168(Top 56%)10494(Top 64%)10494(Top 704%)
20M20.00 mi1.36 mi17159+4211023+2911023+2916931(Top 58%)10709(Top 66%)10709(Top 718%)
21M21.00 mi1.00 mi17188-2911019+411019+417832(Top 61%)11065(Top 68%)11065(Top 742%)
35K21.75 mi0.75 mi17166+2210987+3210987+3217249(Top 59%)10705(Top 66%)10705(Top 718%)
23M23.00 mi1.25 mi17215-4910984+310984+318170(Top 63%)11056(Top 68%)11056(Top 742%)
24M24.00 mi1.00 mi17199+1610950+3410950+3417352(Top 60%)10632(Top 65%)10632(Top 713%)
40K24.85 mi0.85 mi17191+810928+2210928+2217622(Top 61%)10714(Top 66%)10714(Top 719%)
25.2M25.20 mi0.35 mi17237-4610943-1510943-1519874(Top 68%)11781(Top 72%)11781(Top 790%)
FINISH26.22 mi1.02 mi17318-8110959-1610959-1618815(Top 65%)11279(Top 69%)11279(Top 756%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21
+97ft-345ft

Overall

18070

Males

11483

M55-59

11483

5K→10K

3.1 - 6.2 mi

Top 61%
×5
+79ft-138ft

Overall

17778

Males

11335

M55-59

11335

10K→15K

6.2 - 9.3 mi

Top 62%
×3
+67ft-78ft

Overall

18070

Males

11483

M55-59

11483

15K→20K

9.3 - 12.4 mi

Top 60%
×5
+106ft-86ft

Overall

17402

Males

11170

M55-59

11170

20K→HALF

12.4 - 13.1 mi

Top 59%
×2
+19ft-37ft

Overall

17215

Males

11110

M55-59

11110

HALF→25K

13.1 - 15.5 mi

Top 59%
×4
+66ft-88ft

Overall

16998

Males

10946

M55-59

10946

25K→30K

15.5 - 18.6 mi

Top 56%
×9
+181ft-148ft

Overall

16168

Males

10494

M55-59

10494

30K→20M

18.6 - 20.0 mi

Top 58%
×5
+64ft-50ft

Overall

16931

Males

10709

M55-59

10709

20M→21M

20.0 - 21.0 mi

Top 61%
×8
+106ft-24ft

Overall

17832

Males

11065

M55-59

11065

21M→35K

21.0 - 21.8 mi

Top 59%
×7
+17ft-86ft

Overall

17249

Males

10705

M55-59

10705

35K→23M

21.8 - 23.0 mi

Top 63%
×5
+23ft-63ft

Overall

18170

Males

11056

M55-59

11056

23M→24M

23.0 - 24.0 mi

Top 60%
×6
+12ft-82ft

Overall

17352

Males

10632

M55-59

10632

24M→40K

24.0 - 24.9 mi

Top 61%
×1
+6ft-20ft

Overall

17622

Males

10714

M55-59

10714

40K→25.2M

24.9 - 25.2 mi

Top 68%
×1
+13ft-16ft

Overall

19874

Males

11781

M55-59

11781

25.2M→FINISH

25.2 - 26.2 mi

Top 65%
×2
+22ft-21ft

Overall

18815

Males

11279

M55-59

11279

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
1613
Passed By
1674
Net Change
-61
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17257
5K → 10K164415-251#17257#17508
10K → 15K107316-209#17508#17717
15K → 20K213120+93#17717#17624
20K → HALF5624+32#17624#17592
HALF → 25K17577+98#17592#17494
25K → 30K35461+293#17494#17201
30K → 20M10260+42#17201#17159
20M → 21M79108-29#17159#17188
21M → 35K7250+22#17188#17166
35K → 23M88137-49#17166#17215
23M → 24M7963+16#17215#17199
24M → 40K6961+8#17199#17191
40K → 25.2M1965-46#17191#17237
25.2M → FINISH36117-81#17237#17318
TOTALS16131674-61
📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Qualifying & Age Grade

See how your performance stacks up against qualifying standards

OTQ

Olympic Trials Qualifying analysis available

Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing