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BOSTON MARATHON 2023

Richard Koo

Bib: 13074•M

ON

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 38%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 42%
Division (M45-49)
#0 / 2252
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:30
Rank: #10192
Start → 5K
23:30 | 7:34/mi
10K· 6.21 mi
46:32
Rank: #9911 (+281)
5K → 10K
23:02 | 7:25/mi
15K· 9.32 mi
1:09:45
Rank: #9882 (+29)
10K → 15K
23:13 | 7:28/mi
20K· 12.43 mi
1:33:19
Rank: #9904 (-22)
15K → 20K
23:34 | 7:35/mi
Half· 13.11 mi
1:38:24
Rank: #9896 (+8)
20K → Half
5:05 | 7:27/mi
25K· 15.53 mi
1:57:01
Rank: #9912 (-16)
Half → 25K
18:37 | 7:41/mi
30K· 18.64 mi
2:21:46
Rank: #10009 (-97)
25K → 30K
24:45 | 7:58/mi
20M
2:32:38
Rank: #9990 (+19)
30K → 20M
10:52 | 8:00/mi
21M
2:41:06
Rank: #9988 (+2)
20M → 21M
8:28 | 8:28/mi
35K· 21.75 mi
2:47:03
Rank: #10032 (-44)
21M → 35K
5:57 | 7:57/mi
23M
2:57:18
Rank: #10076 (-44)
35K → 23M
10:15 | 8:11/mi
24M
3:05:13
Rank: #10084 (-8)
23M → 24M
7:55 | 7:55/mi
40K· 24.85 mi
3:12:10
Rank: #10091 (-7)
24M → 40K
6:57 | 8:08/mi
25.2M
3:15:11
Rank: #10086 (+5)
40K → 25.2M
3:01 | 8:45/mi
Finish· 26.22 mi
3:23:03
Rank: #10058 (+28)
25.2M → Finish
7:52 | 7:43/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:38:24
Pace7:30 /mi
2nd Half
Distance13.11 mi
Time1:44:39
Pace7:59 /mi
📊Positive Split: 6.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:0223:307:3423:30
7:34
-
10K
6.21 mi11:15:0446:327:2923:02
7:25
-0:09
15K
9.32 mi11:38:171:09:457:2923:13
7:28
+0:03
20K
12.43 mi12:01:511:33:197:3123:34
7:35
+0:07
Half
13.11 mi12:06:561:38:247:305:05
7:27
-0:08
25K
15.53 mi12:25:331:57:017:3218:37
7:41
+0:14
30K
18.64 mi12:50:182:21:467:3624:45
7:58
+0:17
20M
20.00 mi13:01:102:32:387:3810:52
8:00
+0:02
21M
21.00 mi13:09:382:41:067:408:28
8:28
+0:28
35K
21.75 mi13:15:352:47:037:415:57
7:57
-0:31
23M
23.00 mi13:25:502:57:187:4310:15
8:11
+0:14
24M
24.00 mi13:33:453:05:137:437:55
7:55
-0:16
40K
24.85 mi13:40:423:12:107:446:57
8:08
+0:13
25.2M
25.20 mi13:43:433:15:117:453:01
8:45
+0:37
Finish
26.22 mi13:51:353:23:037:457:52
7:43
-1:02

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

7:25 /mi

Average Pace

7:45 /mi

Slowest Pace

8:45 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:01:19

89% of race

Time at Steady Pace

21:44

11% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:45 /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 mi10:52:0223:307:3423:30
7:34
#10192
10K
6.21 mi11:15:0446:327:2923:02
7:25
#9911
15K
9.32 mi11:38:171:09:457:2923:13
7:28
#9882
20K
12.43 mi12:01:511:33:197:3123:34
7:35
#9904
Half
13.11 mi12:06:561:38:247:305:05
7:27
#9896
25K
15.53 mi12:25:331:57:017:3218:37
7:41
#9912
30K
18.64 mi12:50:182:21:467:3624:45
7:58
#10009
20M
20.00 mi13:01:102:32:387:3810:52
8:00
#9990
21M
21.00 mi13:09:382:41:067:408:28
8:28
#9988
35K
21.75 mi13:15:352:47:037:415:57
7:57
#10032
23M
23.00 mi13:25:502:57:187:4310:15
8:11
#10076
24M
24.00 mi13:33:453:05:137:437:55
7:55
#10084
40K
24.85 mi13:40:423:12:107:446:57
8:08
#10091
25.2M
25.20 mi13:43:433:15:117:453:01
8:45
#10086
Finish
26.22 mi13:51:353:23:037:457:52
7:43
#10058
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi10192823282329944(Top 37%)8116(Top 53%)8116(Top 360%)
10K6.21 mi3.10 mi9911+2818099+1338099+1339742(Top 37%)8024(Top 53%)8024(Top 356%)
15K9.32 mi3.11 mi9882+298093+68093+69944(Top 37%)8116(Top 53%)8116(Top 360%)
20K12.43 mi3.11 mi9904-228095-28095-29971(Top 37%)8058(Top 53%)8058(Top 358%)
Half13.11 mi0.68 mi9896+8809580959789(Top 37%)7982(Top 53%)7982(Top 354%)
25K15.53 mi2.42 mi9912-168082+138082+1310123(Top 38%)8057(Top 53%)8057(Top 358%)
30K18.64 mi3.11 mi10009-978103-218103-2110606(Top 40%)8141(Top 54%)8141(Top 362%)
20M20.00 mi1.36 mi9990+198063+408063+4010215(Top 38%)7868(Top 52%)7868(Top 349%)
21M21.00 mi1.00 mi9988+28032+318032+3110257(Top 39%)7735(Top 51%)7735(Top 343%)
35K21.75 mi0.75 mi10032-448032803211723(Top 44%)8423(Top 56%)8423(Top 374%)
23M23.00 mi1.25 mi10076-448029+38029+311077(Top 42%)8008(Top 53%)8008(Top 356%)
24M24.00 mi1.00 mi10084-88002+278002+2710623(Top 40%)7719(Top 51%)7719(Top 343%)
40K24.85 mi0.85 mi10091-77977+257977+2510860(Top 41%)7767(Top 51%)7767(Top 345%)
25.2M25.20 mi0.35 mi10086+57963+147963+1410951(Top 41%)7762(Top 51%)7762(Top 345%)
Finish26.22 mi1.02 mi10058+287923+407923+4010076(Top 38%)7330(Top 48%)7330(Top 325%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 37%
×21stories
+97ft-345ft

Overall

9944

Males

8116

M45-49

8116

5K→10K

3.1 - 6.2 mi

Top 37%
×5stories
+79ft-138ft

Overall

9742

Males

8024

M45-49

8024

10K→15K

6.2 - 9.3 mi

Top 37%
×3stories
+67ft-78ft

Overall

9944

Males

8116

M45-49

8116

15K→20K

9.3 - 12.4 mi

Top 37%
×5stories
+106ft-86ft

Overall

9971

Males

8058

M45-49

8058

20K→Half

12.4 - 13.1 mi

Top 37%
×2stories
+19ft-37ft

Overall

9789

Males

7982

M45-49

7982

Half→25K

13.1 - 15.5 mi

Top 38%
×4stories
+66ft-88ft

Overall

10123

Males

8057

M45-49

8057

25K→30K

15.5 - 18.6 mi

Top 40%
×9stories
+181ft-148ft

Overall

10606

Males

8141

M45-49

8141

30K→20M

18.6 - 20.0 mi

Top 38%
×5stories
+64ft-50ft

Overall

10215

Males

7868

M45-49

7868

20M→21M

20.0 - 21.0 mi

Top 39%
×8stories
+106ft-24ft

Overall

10257

Males

7735

M45-49

7735

21M→35K

21.0 - 21.8 mi

Top 44%
×7stories
+17ft-86ft

Overall

11723

Males

8423

M45-49

8423

35K→23M

21.8 - 23.0 mi

Top 42%
×5stories
+23ft-63ft

Overall

11077

Males

8008

M45-49

8008

23M→24M

23.0 - 24.0 mi

Top 40%
×6stories
+12ft-82ft

Overall

10623

Males

7719

M45-49

7719

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

10860

Males

7767

M45-49

7767

40K→25.2M

24.9 - 25.2 mi

Top 41%
×1story
+13ft-16ft

Overall

10951

Males

7762

M45-49

7762

25.2M→Finish

25.2 - 26.2 mi

Top 38%
×2stories
+22ft-21ft

Overall

10076

Males

7330

M45-49

7330

Passing Analysis

Category:
Athletes Passed
1624*
Passed By
1485
Net Change
+134
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10192
5K → 10K459*178+281#10192#9911
10K → 15K193164+29#9911#9882
15K → 20K158*180-22#9882#9904
20K → Half3527+8#9904#9896
Half → 25K108123-16#9896#9912
25K → 30K123220-97#9912#10009
30K → 20M102*83+19#10009#9990
20M → 21M8683+2#9990#9988
21M → 35K3779-44#9988#10032
35K → 23M66110-44#10032#10076
23M → 24M6976-8#10076#10084
24M → 40K6269-7#10084#10091
40K → 25.2M38*33+5#10091#10086
25.2M → Finish8860+28#10086#10058
TOTALS1624*1485+134

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Visuals

Category:
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🔥Passing Intensity

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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