Boston Marathon logo
BOSTON MARATHON 2023

Eric Seifert

Bib: 9177•M

MI

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 46%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 50%
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
7:20/mi
22:47
↑ 97↓ 3451.5%
10K· 6.21 mi
7:04/mi
44:44
↑ 79↓ 1380.4%
15K· 9.32 mi
7:06/mi
1:06:47
↑ 67↓ 78
20K· 12.43 mi
7:18/mi
1:29:27
↑ 106↓ 860.1%
Half· 13.11 mi
7:14/mi
1:34:23
↑ 19↓ 370.5%
25K· 15.53 mi
7:32/mi
1:52:38
↑ 66↓ 880.2%
30K· 18.64 mi
8:04/mi
2:17:43
↑ 181↓ 1480.2%
20M
10:48/mi
2:32:23
↑ 64↓ 500.2%
21M
9:51/mi
2:42:14
↑ 106↓ 241.6%
35K· 21.75 mi
8:51/mi
2:48:51
↑ 17↓ 861.7%
23M
9:52/mi
3:01:12
↑ 23↓ 630.6%
24M
8:47/mi
3:09:59
↓ 821.3%
40K· 24.85 mi
8:53/mi
3:17:35
↓ 200.3%
25.2M
9:05/mi
3:20:43
↑ 13↓ 160.2%
Finish· 26.22 mi
8:41/mi
3:29:34
↑ 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
Time1:34:23
Pace7:12 /mi
2nd Half
Distance13.11 mi
Time1:55:11
Pace8:47 /mi
📊Positive Split: 22.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:3322:477:2022:47
7:20
-
10K
6.21 mi11:10:3044:447:1221:57
7:04
-0:16
15K
9.32 mi11:32:331:06:477:1022:03
7:06
+0:02
20K
12.43 mi11:55:131:29:277:1222:40
7:18
+0:12
Half
13.11 mi12:00:091:34:237:124:56
7:14
-0:04
25K
15.53 mi12:18:241:52:387:1518:15
7:32
+0:18
30K
18.64 mi12:43:292:17:437:2325:05
8:04
+0:32
20M
20.00 mi12:58:092:32:237:3714:40
10:48
+2:44
21M
21.00 mi13:08:002:42:147:449:51
9:51
-0:57
35K
21.75 mi13:14:372:48:517:466:37
8:51
-1:00
23M
23.00 mi13:26:583:01:127:5312:21
9:52
+1:01
24M
24.00 mi13:35:453:09:597:558:47
8:47
-1:05
40K
24.85 mi13:43:213:17:357:577:36
8:53
+0:06
25.2M
25.20 mi13:46:293:20:437:583:08
9:05
+0:12
Finish
26.22 mi13:55:203:29:348:008:51
8:41
-0:24

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

7:04 /mi

Average Pace

8:00 /mi

Slowest Pace

10:48 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:17:43

66% of race

Time at Steady Pace

34:59

17% of race

Time at Slower Pace

36:52

18% of race

Average Pace: 8:00 /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 mi10:48:3322:477:2022:47
7:20
#8333
10K
6.21 mi11:10:3044:447:1221:57
7:04
#7758
15K
9.32 mi11:32:331:06:477:1022:03
7:06
#7525
20K
12.43 mi11:55:131:29:277:1222:40
7:18
#7529
Half
13.11 mi12:00:091:34:237:124:56
7:14
#7540
25K
15.53 mi12:18:241:52:387:1518:15
7:32
#7726
30K
18.64 mi12:43:292:17:437:2325:05
8:04
#8265
20M
20.00 mi12:58:092:32:237:3714:40
10:48
#9892
21M
21.00 mi13:08:002:42:147:449:51
9:51
#10431
35K
21.75 mi13:14:372:48:517:466:37
8:51
#10690
23M
23.00 mi13:26:583:01:127:5312:21
9:52
#11463
24M
24.00 mi13:35:453:09:597:558:47
8:47
#11714
40K
24.85 mi13:43:213:17:357:577:36
8:53
#11879
25.2M
25.20 mi13:46:293:20:437:583:08
9:05
#11896
Finish
26.22 mi13:55:203:29:348:008:51
8:41
#12114
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi8333719171917146(Top 27%)6352(Top 42%)6352(Top 310%)
10K6.21 mi3.10 mi7758+5756816+3756816+3757212(Top 27%)6390(Top 42%)6390(Top 311%)
15K9.32 mi3.11 mi7525+2336637+1796637+1797146(Top 27%)6352(Top 42%)6352(Top 310%)
20K12.43 mi3.11 mi7529-46629+86629+87759(Top 29%)6734(Top 44%)6734(Top 328%)
Half13.11 mi0.68 mi7540-116633-46633-48109(Top 30%)6981(Top 46%)6981(Top 340%)
25K15.53 mi2.42 mi7726-1866739-1066739-1068982(Top 34%)7429(Top 49%)7429(Top 362%)
30K18.64 mi3.11 mi8265-5397040-3017040-30111453(Top 43%)8563(Top 56%)8563(Top 417%)
20M20.00 mi1.36 mi9892-16278009-9698009-96922322(Top 84%)13143(Top 87%)13143(Top 640%)
21M21.00 mi1.00 mi10431-5398252-2438252-24317415(Top 65%)10950(Top 72%)10950(Top 534%)
35K21.75 mi0.75 mi10690-2598357-1058357-10517129(Top 64%)10748(Top 71%)10748(Top 524%)
23M23.00 mi1.25 mi11463-7738699-3428699-34219586(Top 74%)11829(Top 78%)11829(Top 576%)
24M24.00 mi1.00 mi11714-2518794-958794-9516072(Top 60%)10200(Top 67%)10200(Top 497%)
40K24.85 mi0.85 mi11879-1658837-438837-4315517(Top 58%)9900(Top 65%)9900(Top 482%)
25.2M25.20 mi0.35 mi11896-178835+28835+212955(Top 49%)8735(Top 58%)8735(Top 426%)
Finish26.22 mi1.02 mi12114-2188910-758910-7516377(Top 62%)10322(Top 68%)10322(Top 503%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 27%
×21story building
+97ft-345ft

Overall

7146

Males

6352

M50-54

6352

5K→10K

3.1 - 6.2 mi

Top 27%
×5story building
+79ft-138ft

Overall

7212

Males

6390

M50-54

6390

10K→15K

6.2 - 9.3 mi

Top 27%
×3story building
+67ft-78ft

Overall

7146

Males

6352

M50-54

6352

15K→20K

9.3 - 12.4 mi

Top 29%
×5story building
+106ft-86ft

Overall

7759

Males

6734

M50-54

6734

20K→Half

12.4 - 13.1 mi

Top 30%
×2story building
+19ft-37ft

Overall

8109

Males

6981

M50-54

6981

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

8982

Males

7429

M50-54

7429

25K→30K

15.5 - 18.6 mi

Top 43%
×9story building
+181ft-148ft

Overall

11453

Males

8563

M50-54

8563

30K→20M

18.6 - 20.0 mi

Top 84%
×5story building
+64ft-50ft

Overall

22322

Males

13143

M50-54

13143

20M→21M

20.0 - 21.0 mi

Top 65%
×8story building
+106ft-24ft

Overall

17415

Males

10950

M50-54

10950

21M→35K

21.0 - 21.8 mi

Top 64%
×7story building
+17ft-86ft

Overall

17129

Males

10748

M50-54

10748

35K→23M

21.8 - 23.0 mi

Top 74%
×5story building
+23ft-63ft

Overall

19586

Males

11829

M50-54

11829

23M→24M

23.0 - 24.0 mi

Top 60%
×6story building
+12ft-82ft

Overall

16072

Males

10200

M50-54

10200

24M→40K

24.0 - 24.9 mi

Top 58%
×1story
+6ft-20ft

Overall

15517

Males

9900

M50-54

9900

40K→25.2M

24.9 - 25.2 mi

Top 49%
×1story
+13ft-16ft

Overall

12955

Males

8735

M50-54

8735

25.2M→Finish

25.2 - 26.2 mi

Top 62%
×2story building
+22ft-21ft

Overall

16377

Males

10322

M50-54

10322

Passing Analysis

Category:
Athletes Passed
1260
Passed By
5039
Net Change
-3781
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8333
5K → 10K63459+575#8333#7758
10K → 15K28047+233#7758#7525
15K → 20K117121-4#7525#7529
20K → Half1829-11#7529#7540
Half → 25K42228-186#7540#7726
25K → 30K35574-539#7726#8265
30K → 20M21629-1627#8265#9892
20M → 21M10547-539#9892#10431
21M → 35K15274-259#10431#10690
35K → 23M8781-773#10690#11463
23M → 24M17268-251#11463#11714
24M → 40K31196-165#11714#11879
40K → 25.2M2542-17#11879#11896
25.2M → Finish26244-218#11896#12114
TOTALS12605039-3781
📊

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