Boston Marathon logo
BOSTON MARATHON 2023

Frans Klaassen

Bib: 13590•M

ON

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 47%
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

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
7:50/mi
24:19
↑ 97↓ 3451.5%
10K· 6.21 mi
7:51/mi
48:43
↑ 79↓ 1380.4%
15K· 9.32 mi
7:53/mi
1:13:12
↑ 67↓ 78
20K· 12.43 mi
7:55/mi
1:37:49
↑ 106↓ 860.1%
Half· 13.11 mi
7:53/mi
1:43:12
↑ 19↓ 370.5%
25K· 15.53 mi
7:57/mi
2:02:29
↑ 66↓ 880.2%
30K· 18.64 mi
8:17/mi
2:28:14
↑ 181↓ 1480.2%
20M
8:17/mi
2:39:30
↑ 64↓ 500.2%
21M
8:51/mi
2:48:21
↑ 106↓ 241.6%
35K· 21.75 mi
8:13/mi
2:54:30
↑ 17↓ 861.7%
23M
8:18/mi
3:04:54
↑ 23↓ 630.6%
24M
8:06/mi
3:13:00
↓ 821.3%
40K· 24.85 mi
8:15/mi
3:20:03
↓ 200.3%
25.2M
8:54/mi
3:23:07
↑ 13↓ 160.2%
Finish· 26.22 mi
7:49/mi
3:31:05
↑ 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
Time1:43:12
Pace7:52 /mi
2nd Half
Distance13.11 mi
Time1:47:53
Pace8:14 /mi
📊Positive Split: 4.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:2724:197:5024:19
7:50
-
10K
6.21 mi11:16:5148:437:5024:24
7:51
+0:01
15K
9.32 mi11:41:201:13:127:5124:29
7:53
+0:02
20K
12.43 mi12:05:571:37:497:5224:37
7:55
+0:02
Half
13.11 mi12:11:201:43:127:525:23
7:53
-0:02
25K
15.53 mi12:30:372:02:297:5319:17
7:57
+0:04
30K
18.64 mi12:56:222:28:147:5725:45
8:17
+0:20
20M
20.00 mi13:07:382:39:307:5811:16
8:17
0:00
21M
21.00 mi13:16:292:48:218:018:51
8:51
+0:34
35K
21.75 mi13:22:382:54:308:016:09
8:13
-0:38
23M
23.00 mi13:33:023:04:548:0210:24
8:18
+0:05
24M
24.00 mi13:41:083:13:008:038:06
8:06
-0:12
40K
24.85 mi13:48:113:20:038:037:03
8:15
+0:09
25.2M
25.20 mi13:51:153:23:078:043:04
8:54
+0:39
Finish
26.22 mi13:59:133:31:058:037:58
7:49
-1:05

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

7:49 /mi

Average Pace

8:03 /mi

Slowest Pace

8:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:19:10

94% of race

Time at Steady Pace

11:55

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:03 /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 mi10:52:2724:197:5024:19
7:50
#12598
10K
6.21 mi11:16:5148:437:5024:24
7:51
#13080
15K
9.32 mi11:41:201:13:127:5124:29
7:53
#13167
20K
12.43 mi12:05:571:37:497:5224:37
7:55
#13047
Half
13.11 mi12:11:201:43:127:525:23
7:53
#13059
25K
15.53 mi12:30:372:02:297:5319:17
7:57
#12913
30K
18.64 mi12:56:222:28:147:5725:45
8:17
#12917
20M
20.00 mi13:07:382:39:307:5811:16
8:17
#12834
21M
21.00 mi13:16:292:48:218:018:51
8:51
#12791
35K
21.75 mi13:22:382:54:308:016:09
8:13
#12815
23M
23.00 mi13:33:023:04:548:0210:24
8:18
#12744
24M
24.00 mi13:41:083:13:008:038:06
8:06
#12698
40K
24.85 mi13:48:113:20:038:037:03
8:15
#12658
25.2M
25.20 mi13:51:153:23:078:043:04
8:54
#12642
Finish
26.22 mi13:59:133:31:058:037:58
7:49
#12562
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi125989366936613339(Top 50%)9631(Top 63%)9631(Top 469%)
10K6.21 mi3.10 mi13080-4829569-2039569-20313578(Top 51%)9779(Top 64%)9779(Top 477%)
15K9.32 mi3.11 mi13167-879585-169585-1613339(Top 50%)9631(Top 63%)9631(Top 469%)
20K12.43 mi3.11 mi13047+1209519+669519+6612799(Top 48%)9344(Top 62%)9344(Top 455%)
Half13.11 mi0.68 mi13059-129525-69525-613451(Top 51%)9656(Top 64%)9656(Top 471%)
25K15.53 mi2.42 mi12913+1469438+879438+8712321(Top 46%)9040(Top 60%)9040(Top 441%)
30K18.64 mi3.11 mi12917-49401+379401+3712945(Top 49%)9206(Top 61%)9206(Top 449%)
20M20.00 mi1.36 mi12834+839345+569345+5612289(Top 46%)8823(Top 58%)8823(Top 430%)
21M21.00 mi1.00 mi12791+439306+399306+3912524(Top 47%)8808(Top 58%)8808(Top 429%)
35K21.75 mi0.75 mi12815-249303+39303+313543(Top 51%)9203(Top 61%)9203(Top 448%)
23M23.00 mi1.25 mi12744+719249+549249+5411913(Top 45%)8431(Top 56%)8431(Top 411%)
24M24.00 mi1.00 mi12698+469209+409209+4011924(Top 45%)8365(Top 55%)8365(Top 408%)
40K24.85 mi0.85 mi12658+409174+359174+3511650(Top 44%)8152(Top 54%)8152(Top 397%)
25.2M25.20 mi0.35 mi12642+169157+179157+1711844(Top 44%)8187(Top 54%)8187(Top 399%)
Finish26.22 mi1.02 mi12562+809101+569101+5610785(Top 41%)7696(Top 51%)7696(Top 375%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 50%
×21story building
+97ft-345ft

Overall

13339

Males

9631

M50-54

9631

5K→10K

3.1 - 6.2 mi

Top 51%
×5story building
+79ft-138ft

Overall

13578

Males

9779

M50-54

9779

10K→15K

6.2 - 9.3 mi

Top 50%
×3story building
+67ft-78ft

Overall

13339

Males

9631

M50-54

9631

15K→20K

9.3 - 12.4 mi

Top 48%
×5story building
+106ft-86ft

Overall

12799

Males

9344

M50-54

9344

20K→Half

12.4 - 13.1 mi

Top 51%
×2story building
+19ft-37ft

Overall

13451

Males

9656

M50-54

9656

Half→25K

13.1 - 15.5 mi

Top 46%
×4story building
+66ft-88ft

Overall

12321

Males

9040

M50-54

9040

25K→30K

15.5 - 18.6 mi

Top 49%
×9story building
+181ft-148ft

Overall

12945

Males

9206

M50-54

9206

30K→20M

18.6 - 20.0 mi

Top 46%
×5story building
+64ft-50ft

Overall

12289

Males

8823

M50-54

8823

20M→21M

20.0 - 21.0 mi

Top 47%
×8story building
+106ft-24ft

Overall

12524

Males

8808

M50-54

8808

21M→35K

21.0 - 21.8 mi

Top 51%
×7story building
+17ft-86ft

Overall

13543

Males

9203

M50-54

9203

35K→23M

21.8 - 23.0 mi

Top 45%
×5story building
+23ft-63ft

Overall

11913

Males

8431

M50-54

8431

23M→24M

23.0 - 24.0 mi

Top 45%
×6story building
+12ft-82ft

Overall

11924

Males

8365

M50-54

8365

24M→40K

24.0 - 24.9 mi

Top 44%
×1story
+6ft-20ft

Overall

11650

Males

8152

M50-54

8152

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

11844

Males

8187

M50-54

8187

25.2M→Finish

25.2 - 26.2 mi

Top 41%
×2story building
+22ft-21ft

Overall

10785

Males

7696

M50-54

7696

Passing Analysis

Category:
Athletes Passed
1710
Passed By
1674
Net Change
+36
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12598
5K → 10K133615-482#12598#13080
10K → 15K180267-87#13080#13167
15K → 20K237117+120#13167#13047
20K → Half3042-12#13047#13059
Half → 25K21569+146#13059#12913
25K → 30K186190-4#12913#12917
30K → 20M13754+83#12917#12834
20M → 21M11572+43#12834#12791
21M → 35K4771-24#12791#12815
35K → 23M11241+71#12815#12744
23M → 24M9145+46#12744#12698
24M → 40K7838+40#12698#12658
40K → 25.2M3822+16#12658#12642
25.2M → Finish11131+80#12642#12562
TOTALS17101674+36
📊

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