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BOSTON MARATHON 2023

Mark Iwanski

Bib: 13506•M

IL

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 40%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 44%
Division (M45-49)
#0 / 2252
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
7:52/mi
24:25
↑ 97↓ 3451.5%
10K· 6.21 mi
7:46/mi
48:34
↑ 79↓ 1380.4%
15K· 9.32 mi
7:41/mi
1:12:26
↑ 67↓ 78
20K· 12.43 mi
7:41/mi
1:36:17
↑ 106↓ 860.1%
Half· 13.11 mi
7:33/mi
1:41:26
↑ 19↓ 370.5%
25K· 15.53 mi
7:46/mi
2:00:15
↑ 66↓ 880.2%
30K· 18.64 mi
7:41/mi
2:24:06
↑ 181↓ 1480.2%
20M
7:43/mi
2:34:35
↑ 64↓ 500.2%
21M
8:22/mi
2:42:57
↑ 106↓ 241.6%
35K· 21.75 mi
7:59/mi
2:48:55
↑ 17↓ 861.7%
23M
8:13/mi
2:59:12
↑ 23↓ 630.6%
24M
7:57/mi
3:07:09
↓ 821.3%
40K· 24.85 mi
8:00/mi
3:13:59
↓ 200.3%
25.2M
8:36/mi
3:16:57
↑ 13↓ 160.2%
Finish· 26.22 mi
7:46/mi
3:24:52
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:41:26
Pace7:44 /mi
2nd Half
Distance13.11 mi
Time1:43:26
Pace7:53 /mi
📊Positive Split: 2.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:54:4624:257:5224:25
7:52
-
10K
6.21 mi11:18:5548:347:4924:09
7:46
-0:06
15K
9.32 mi11:42:471:12:267:4623:52
7:41
-0:05
20K
12.43 mi12:06:381:36:177:4523:51
7:41
0:00
Half
13.11 mi12:11:471:41:267:445:09
7:33
-0:08
25K
15.53 mi12:30:362:00:157:4418:49
7:46
+0:13
30K
18.64 mi12:54:272:24:067:4423:51
7:41
-0:05
20M
20.00 mi13:04:562:34:357:4410:29
7:43
+0:02
21M
21.00 mi13:13:182:42:577:468:22
8:22
+0:39
35K
21.75 mi13:19:162:48:557:465:58
7:59
-0:23
23M
23.00 mi13:29:332:59:127:4710:17
8:13
+0:14
24M
24.00 mi13:37:303:07:097:487:57
7:57
-0:16
40K
24.85 mi13:44:203:13:597:486:50
8:00
+0:03
25.2M
25.20 mi13:47:183:16:577:492:58
8:36
+0:36
Finish
26.22 mi13:55:133:24:527:497:55
7:46
-0:50

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

7:49 /mi

Slowest Pace

8:36 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:13:32

94% of race

Time at Steady Pace

11:20

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:49 /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 mi10:54:4624:257:5224:25
7:52
#12902
10K
6.21 mi11:18:5548:347:4924:09
7:46
#12838
15K
9.32 mi11:42:471:12:267:4623:52
7:41
#12405
20K
12.43 mi12:06:381:36:177:4523:51
7:41
#11934
Half
13.11 mi12:11:471:41:267:445:09
7:33
#11867
25K
15.53 mi12:30:362:00:157:4418:49
7:46
#11624
30K
18.64 mi12:54:272:24:067:4423:51
7:41
#11001
20M
20.00 mi13:04:562:34:357:4410:29
7:43
#10760
21M
21.00 mi13:13:182:42:577:468:22
8:22
#10684
35K
21.75 mi13:19:162:48:557:465:58
7:59
#10712
23M
23.00 mi13:29:332:59:127:4710:17
8:13
#10736
24M
24.00 mi13:37:303:07:097:487:57
7:57
#10719
40K
24.85 mi13:44:203:13:597:486:50
8:00
#10663
25.2M
25.20 mi13:47:183:16:577:492:58
8:36
#10651
Finish
26.22 mi13:55:133:24:527:497:55
7:46
#10604
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi129029495949511680(Top 44%)8939(Top 59%)8939(Top 397%)
10K6.21 mi3.10 mi12838+649479+169479+1612879(Top 48%)9498(Top 63%)9498(Top 422%)
15K9.32 mi3.11 mi12405+4339262+2179262+21711680(Top 44%)8939(Top 59%)8939(Top 397%)
20K12.43 mi3.11 mi11934+4719041+2219041+22110716(Top 40%)8437(Top 56%)8437(Top 375%)
Half13.11 mi0.68 mi11867+679013+289013+2810564(Top 40%)8386(Top 55%)8386(Top 372%)
25K15.53 mi2.42 mi11624+2438894+1198894+11910780(Top 40%)8387(Top 55%)8387(Top 372%)
30K18.64 mi3.11 mi11001+6238577+3178577+3178485(Top 32%)6978(Top 46%)6978(Top 310%)
20M20.00 mi1.36 mi10760+2418431+1468431+1468300(Top 31%)6785(Top 45%)6785(Top 301%)
21M21.00 mi1.00 mi10684+768374+578374+579624(Top 36%)7411(Top 49%)7411(Top 329%)
35K21.75 mi0.75 mi10712-288366+88366+811897(Top 45%)8508(Top 56%)8508(Top 378%)
23M23.00 mi1.25 mi10736-248344+228344+2211245(Top 42%)8094(Top 53%)8094(Top 359%)
24M24.00 mi1.00 mi10719+178315+298315+2910856(Top 41%)7829(Top 52%)7829(Top 348%)
40K24.85 mi0.85 mi10663+568264+518264+519974(Top 37%)7325(Top 48%)7325(Top 325%)
25.2M25.20 mi0.35 mi10651+128243+218243+2110122(Top 38%)7356(Top 48%)7356(Top 327%)
Finish26.22 mi1.02 mi10604+478196+478196+4710429(Top 39%)7513(Top 50%)7513(Top 334%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 44%
×21story building
+97ft-345ft

Overall

11680

Males

8939

M45-49

8939

5K→10K

3.1 - 6.2 mi

Top 48%
×5story building
+79ft-138ft

Overall

12879

Males

9498

M45-49

9498

10K→15K

6.2 - 9.3 mi

Top 44%
×3story building
+67ft-78ft

Overall

11680

Males

8939

M45-49

8939

15K→20K

9.3 - 12.4 mi

Top 40%
×5story building
+106ft-86ft

Overall

10716

Males

8437

M45-49

8437

20K→Half

12.4 - 13.1 mi

Top 40%
×2story building
+19ft-37ft

Overall

10564

Males

8386

M45-49

8386

Half→25K

13.1 - 15.5 mi

Top 40%
×4story building
+66ft-88ft

Overall

10780

Males

8387

M45-49

8387

25K→30K

15.5 - 18.6 mi

Top 32%
×9story building
+181ft-148ft

Overall

8485

Males

6978

M45-49

6978

30K→20M

18.6 - 20.0 mi

Top 31%
×5story building
+64ft-50ft

Overall

8300

Males

6785

M45-49

6785

20M→21M

20.0 - 21.0 mi

Top 36%
×8story building
+106ft-24ft

Overall

9624

Males

7411

M45-49

7411

21M→35K

21.0 - 21.8 mi

Top 45%
×7story building
+17ft-86ft

Overall

11897

Males

8508

M45-49

8508

35K→23M

21.8 - 23.0 mi

Top 42%
×5story building
+23ft-63ft

Overall

11245

Males

8094

M45-49

8094

23M→24M

23.0 - 24.0 mi

Top 41%
×6story building
+12ft-82ft

Overall

10856

Males

7829

M45-49

7829

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

9974

Males

7325

M45-49

7325

40K→25.2M

24.9 - 25.2 mi

Top 38%
×1story
+13ft-16ft

Overall

10122

Males

7356

M45-49

7356

25.2M→Finish

25.2 - 26.2 mi

Top 39%
×2story building
+22ft-21ft

Overall

10429

Males

7513

M45-49

7513

Passing Analysis

Category:
Athletes Passed
3070*
Passed By
772
Net Change
+2298
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12902
5K → 10K338274+64#12902#12838
10K → 15K49360+433#12838#12405
15K → 20K48514+471#12405#11934
20K → Half736+67#11934#11867
Half → 25K27734+243#11867#11624
25K → 30K6296+623#11624#11001
30K → 20M246*5+241#11001#10760
20M → 21M10832+76#10760#10684
21M → 35K4573-28#10684#10712
35K → 23M84108-24#10712#10736
23M → 24M6952+17#10736#10719
24M → 40K9741+56#10719#10663
40K → 25.2M3523+12#10663#10651
25.2M → Finish9144+47#10651#10604
TOTALS3070*772+2298

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

📊

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