Boston Marathon logo
BOSTON MARATHON 2023

Guy Blackden

Bib: 15637•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 38%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 42%
Division (M50-54)
#0 / 2052
Top 42%
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
7:33/mi
23:27
↑ 97↓ 3451.5%
10K· 6.21 mi
7:39/mi
47:13
↑ 79↓ 1380.4%
15K· 9.32 mi
7:41/mi
1:11:05
↑ 67↓ 78
20K· 12.43 mi
7:36/mi
1:34:42
↑ 106↓ 860.1%
Half· 13.11 mi
7:34/mi
1:39:52
↑ 19↓ 370.5%
25K· 15.53 mi
7:41/mi
1:58:29
↑ 66↓ 880.2%
30K· 18.64 mi
7:46/mi
2:22:36
↑ 181↓ 1480.2%
20M
7:50/mi
2:33:15
↑ 64↓ 500.2%
21M
8:07/mi
2:41:22
↑ 106↓ 241.6%
35K· 21.75 mi
7:40/mi
2:47:06
↑ 17↓ 861.7%
23M
8:08/mi
2:57:17
↑ 23↓ 630.6%
24M
7:58/mi
3:05:15
↓ 821.3%
40K· 24.85 mi
8:09/mi
3:12:13
↓ 200.3%
25.2M
8:54/mi
3:15:17
↑ 13↓ 160.2%
Finish· 26.22 mi
7:56/mi
3:23:22
↑ 22↓ 21

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
Time1:39:52
Pace7:37 /mi
2nd Half
Distance13.11 mi
Time1:43:30
Pace7:54 /mi
📊Positive Split: 3.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:3423:277:3323:27
7:33
-
10K
6.21 mi11:17:2047:137:3623:46
7:39
+0:06
15K
9.32 mi11:41:121:11:057:3823:52
7:41
+0:02
20K
12.43 mi12:04:491:34:427:3723:37
7:36
-0:05
Half
13.11 mi12:09:591:39:527:375:10
7:34
-0:02
25K
15.53 mi12:28:361:58:297:3818:37
7:41
+0:07
30K
18.64 mi12:52:432:22:367:3924:07
7:46
+0:05
20M
20.00 mi13:03:222:33:157:4010:39
7:50
+0:04
21M
21.00 mi13:11:292:41:227:418:07
8:07
+0:17
35K
21.75 mi13:17:132:47:067:415:44
7:40
-0:27
23M
23.00 mi13:27:242:57:177:4210:11
8:08
+0:28
24M
24.00 mi13:35:223:05:157:437:58
7:58
-0:10
40K
24.85 mi13:42:203:12:137:446:58
8:09
+0:11
25.2M
25.20 mi13:45:243:15:177:453:04
8:54
+0:45
Finish
26.22 mi13:53:293:23:227:468:05
7:56
-0:58

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

7:33 /mi

Average Pace

7:46 /mi

Slowest Pace

8:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:20:18

98% of race

Time at Steady Pace

3:04

2% 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 mi10:53:3423:277:3323:27
7:33
#10048
10K
6.21 mi11:17:2047:137:3623:46
7:39
#10904
15K
9.32 mi11:41:121:11:057:3823:52
7:41
#11156
20K
12.43 mi12:04:491:34:427:3723:37
7:36
#10869
Half
13.11 mi12:09:591:39:527:375:10
7:34
#10873
25K
15.53 mi12:28:361:58:297:3818:37
7:41
#10710
30K
18.64 mi12:52:432:22:367:3924:07
7:46
#10361
20M
20.00 mi13:03:222:33:157:4010:39
7:50
#10255
21M
21.00 mi13:11:292:41:227:418:07
8:07
#10087
35K
21.75 mi13:17:132:47:067:415:44
7:40
#10053
23M
23.00 mi13:27:242:57:177:4210:11
8:08
#10067
24M
24.00 mi13:35:223:05:157:437:58
7:58
#10099
40K
24.85 mi13:42:203:12:137:446:58
8:09
#10105
25.2M
25.20 mi13:45:243:15:177:453:04
8:54
#10113
Finish
26.22 mi13:53:293:23:227:468:05
7:56
#10157
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi100488152815211678(Top 44%)8937(Top 59%)8937(Top 436%)
10K6.21 mi3.10 mi10904-8568612-4608612-46011772(Top 44%)9010(Top 59%)9010(Top 439%)
15K9.32 mi3.11 mi11156-2528723-1118723-11111678(Top 44%)8937(Top 59%)8937(Top 436%)
20K12.43 mi3.11 mi10869+2878576+1478576+14710095(Top 38%)8121(Top 54%)8121(Top 396%)
Half13.11 mi0.68 mi10873-48587-118587-1110753(Top 40%)8479(Top 56%)8479(Top 413%)
25K15.53 mi2.42 mi10710+1638490+978490+9710124(Top 38%)8058(Top 53%)8058(Top 393%)
30K18.64 mi3.11 mi10361+3498266+2248266+2249074(Top 34%)7334(Top 48%)7334(Top 357%)
20M20.00 mi1.36 mi10255+1068194+728194+729141(Top 34%)7279(Top 48%)7279(Top 355%)
21M21.00 mi1.00 mi10087+1688088+1068088+1068118(Top 30%)6554(Top 43%)6554(Top 319%)
35K21.75 mi0.75 mi10053+348047+418047+419684(Top 36%)7456(Top 49%)7456(Top 363%)
23M23.00 mi1.25 mi10067-148027+208027+2010680(Top 40%)7804(Top 51%)7804(Top 380%)
24M24.00 mi1.00 mi10099-328013+148013+1410981(Top 41%)7885(Top 52%)7885(Top 384%)
40K24.85 mi0.85 mi10105-67985+287985+2810998(Top 41%)7837(Top 52%)7837(Top 382%)
25.2M25.20 mi0.35 mi10113-87982+37982+311812(Top 44%)8155(Top 54%)8155(Top 397%)
Finish26.22 mi1.02 mi10157-447969+137969+1311591(Top 44%)8084(Top 53%)8084(Top 394%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 44%
×21story building
+97ft-345ft

Overall

11678

Males

8937

M50-54

8937

5K→10K

3.1 - 6.2 mi

Top 44%
×5story building
+79ft-138ft

Overall

11772

Males

9010

M50-54

9010

10K→15K

6.2 - 9.3 mi

Top 44%
×3story building
+67ft-78ft

Overall

11678

Males

8937

M50-54

8937

15K→20K

9.3 - 12.4 mi

Top 38%
×5story building
+106ft-86ft

Overall

10095

Males

8121

M50-54

8121

20K→Half

12.4 - 13.1 mi

Top 40%
×2story building
+19ft-37ft

Overall

10753

Males

8479

M50-54

8479

Half→25K

13.1 - 15.5 mi

Top 38%
×4story building
+66ft-88ft

Overall

10124

Males

8058

M50-54

8058

25K→30K

15.5 - 18.6 mi

Top 34%
×9story building
+181ft-148ft

Overall

9074

Males

7334

M50-54

7334

30K→20M

18.6 - 20.0 mi

Top 34%
×5story building
+64ft-50ft

Overall

9141

Males

7279

M50-54

7279

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

8118

Males

6554

M50-54

6554

21M→35K

21.0 - 21.8 mi

Top 36%
×7story building
+17ft-86ft

Overall

9684

Males

7456

M50-54

7456

35K→23M

21.8 - 23.0 mi

Top 40%
×5story building
+23ft-63ft

Overall

10680

Males

7804

M50-54

7804

23M→24M

23.0 - 24.0 mi

Top 41%
×6story building
+12ft-82ft

Overall

10981

Males

7885

M50-54

7885

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

10998

Males

7837

M50-54

7837

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

11812

Males

8155

M50-54

8155

25.2M→Finish

25.2 - 26.2 mi

Top 44%
×2story building
+22ft-21ft

Overall

11591

Males

8084

M50-54

8084

Passing Analysis

Category:
Athletes Passed
1770*
Passed By
1877
Net Change
-109
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10048
5K → 10K59914-856#10048#10904
10K → 15K100352-252#10904#11156
15K → 20K32033+287#11156#10869
20K → Half3034-4#10869#10873
Half → 25K20643+163#10873#10710
25K → 30K38031+349#10710#10361
30K → 20M135*29+106#10361#10255
20M → 21M1768+168#10255#10087
21M → 35K6733+34#10087#10053
35K → 23M7892-14#10053#10067
23M → 24M6192-32#10067#10099
24M → 40K7177-6#10099#10105
40K → 25.2M29*37-8#10105#10113
25.2M → Finish58102-44#10113#10157
TOTALS1770*1877-109

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

📊

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

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing