Boston Marathon logo
BOSTON MARATHON 2023

Alexander Byrnes

Bib: 5639•M

PA

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 14%
Gender (Male)
#0 / 15176
Top 23%
Division (M18-39)
#0 / 5285
Top 47%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:21
Rank: #5310
Start → 5K
21:21 | 6:52/mi
10K· 6.21 mi
42:29
Rank: #5268 (+42)
5K → 10K
21:08 | 6:48/mi
15K· 9.32 mi
1:03:31
Rank: #5123 (+145)
10K → 15K
21:02 | 6:46/mi
20K· 12.43 mi
1:24:34
Rank: #4891 (+232)
15K → 20K
21:03 | 6:47/mi
Half· 13.11 mi
1:29:13
Rank: #4915 (-24)
20K → Half
4:39 | 6:49/mi
25K· 15.53 mi
1:45:37
Rank: #4683 (+232)
Half → 25K
16:24 | 6:46/mi
30K· 18.64 mi
2:06:53
Rank: #4361 (+322)
25K → 30K
21:16 | 6:51/mi
20M
2:16:17
Rank: #4277 (+84)
30K → 20M
9:24 | 6:55/mi
21M
2:23:12
Rank: #4047 (+230)
20M → 21M
6:55 | 6:55/mi
35K· 21.75 mi
2:28:09
Rank: #3980 (+67)
21M → 35K
4:57 | 6:37/mi
23M
2:36:49
Rank: #3908 (+72)
35K → 23M
8:40 | 6:55/mi
24M
2:43:37
Rank: #3888 (+20)
23M → 24M
6:48 | 6:48/mi
40K· 24.85 mi
2:49:32
Rank: #3853 (+35)
24M → 40K
5:55 | 6:55/mi
25.2M
2:52:03
Rank: #3821 (+32)
40K → 25.2M
2:31 | 7:18/mi
Finish· 26.22 mi
2:58:41
Rank: #3739 (+82)
25.2M → Finish
6:38 | 6:31/mi

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 Half⚖️ Balanced
Distance13.11 mi
Time1:29:13
Pace6:48 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:29:28
Pace6:49 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:24:0821:216:5221:21
6:52
-
10K
6.21 mi10:45:1642:296:5021:08
6:48
-0:04
15K
9.32 mi11:06:181:03:316:4921:02
6:46
-0:02
20K
12.43 mi11:27:211:24:346:4821:03
6:47
+0:01
Half
13.11 mi11:32:001:29:136:484:39
6:49
+0:02
25K
15.53 mi11:48:241:45:376:4816:24
6:46
-0:03
30K
18.64 mi12:09:402:06:536:4821:16
6:51
+0:05
20M
20.00 mi12:19:042:16:176:499:24
6:55
+0:04
21M
21.00 mi12:25:592:23:126:496:55
6:55
0:00
35K
21.75 mi12:30:562:28:096:494:57
6:37
-0:18
23M
23.00 mi12:39:362:36:496:498:40
6:55
+0:18
24M
24.00 mi12:46:242:43:376:496:48
6:48
-0:07
40K
24.85 mi12:52:192:49:326:495:55
6:55
+0:07
25.2M
25.20 mi12:54:502:52:036:502:31
7:18
+0:23
Finish
26.22 mi13:01:282:58:416:496:38
6:31
-0:47

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

6:31 /mi

Average Pace

6:49 /mi

Slowest Pace

7:18 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:56:10

99% of race

Time at Steady Pace

2:31

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:49 /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 mi10:24:0821:216:5221:21
6:52
#5310
10K
6.21 mi10:45:1642:296:5021:08
6:48
#5268
15K
9.32 mi11:06:181:03:316:4921:02
6:46
#5123
20K
12.43 mi11:27:211:24:346:4821:03
6:47
#4891
Half
13.11 mi11:32:001:29:136:484:39
6:49
#4915
25K
15.53 mi11:48:241:45:376:4816:24
6:46
#4683
30K
18.64 mi12:09:402:06:536:4821:16
6:51
#4361
20M
20.00 mi12:19:042:16:176:499:24
6:55
#4277
21M
21.00 mi12:25:592:23:126:496:55
6:55
#4047
35K
21.75 mi12:30:562:28:096:494:57
6:37
#3980
23M
23.00 mi12:39:362:36:496:498:40
6:55
#3908
24M
24.00 mi12:46:242:43:376:496:48
6:48
#3888
40K
24.85 mi12:52:192:49:326:495:55
6:55
#3853
25.2M
25.20 mi12:54:502:52:036:502:31
7:18
#3821
Finish
26.22 mi13:01:282:58:416:496:38
6:31
#3739
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi5310490849084800(Top 18%)4471(Top 29%)4471(Top 85%)
10K6.21 mi3.10 mi5268+424872+364872+365303(Top 20%)4898(Top 32%)4898(Top 93%)
15K9.32 mi3.11 mi5123+1454750+1224750+1224800(Top 18%)4471(Top 29%)4471(Top 85%)
20K12.43 mi3.11 mi4891+2324555+1954555+1954208(Top 16%)3939(Top 26%)3939(Top 75%)
Half13.11 mi0.68 mi4915-244572-174572-175305(Top 20%)4888(Top 32%)4888(Top 92%)
25K15.53 mi2.42 mi4683+2324362+2104362+2103837(Top 14%)3609(Top 24%)3609(Top 68%)
30K18.64 mi3.11 mi4361+3224079+2834079+2833298(Top 12%)3108(Top 20%)3108(Top 59%)
20M20.00 mi1.36 mi4277+844006+734006+733566(Top 13%)3325(Top 22%)3325(Top 63%)
21M21.00 mi1.00 mi4047+2303797+2093797+2091787(Top 7%)1699(Top 11%)1699(Top 32%)
35K21.75 mi0.75 mi3980+673737+603737+603110(Top 12%)2912(Top 19%)2912(Top 55%)
23M23.00 mi1.25 mi3908+723673+643673+643371(Top 13%)3124(Top 21%)3124(Top 59%)
24M24.00 mi1.00 mi3888+203649+243649+243644(Top 14%)3343(Top 22%)3343(Top 63%)
40K24.85 mi0.85 mi3853+353618+313618+313426(Top 13%)3127(Top 21%)3127(Top 59%)
25.2M25.20 mi0.35 mi3821+323590+283590+282955(Top 11%)2710(Top 18%)2710(Top 51%)
Finish26.22 mi1.02 mi3739+823512+783512+782543(Top 10%)2337(Top 15%)2337(Top 44%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 18%
×21stories
+97ft-345ft

Overall

4800

Males

4471

M18-39

4471

5K→10K

3.1 - 6.2 mi

Top 20%
×5stories
+79ft-138ft

Overall

5303

Males

4898

M18-39

4898

10K→15K

6.2 - 9.3 mi

Top 18%
×3stories
+67ft-78ft

Overall

4800

Males

4471

M18-39

4471

15K→20K

9.3 - 12.4 mi

Top 16%
×5stories
+106ft-86ft

Overall

4208

Males

3939

M18-39

3939

20K→Half

12.4 - 13.1 mi

Top 20%
×2stories
+19ft-37ft

Overall

5305

Males

4888

M18-39

4888

Half→25K

13.1 - 15.5 mi

Top 14%
×4stories
+66ft-88ft

Overall

3837

Males

3609

M18-39

3609

25K→30K

15.5 - 18.6 mi

Top 12%
×9stories
+181ft-148ft

Overall

3298

Males

3108

M18-39

3108

30K→20M

18.6 - 20.0 mi

Top 13%
×5stories
+64ft-50ft

Overall

3566

Males

3325

M18-39

3325

20M→21M

20.0 - 21.0 mi

Top 7%
×8stories
+106ft-24ft

Overall

1787

Males

1699

M18-39

1699

21M→35K

21.0 - 21.8 mi

Top 12%
×7stories
+17ft-86ft

Overall

3110

Males

2912

M18-39

2912

35K→23M

21.8 - 23.0 mi

Top 13%
×5stories
+23ft-63ft

Overall

3371

Males

3124

M18-39

3124

23M→24M

23.0 - 24.0 mi

Top 14%
×6stories
+12ft-82ft

Overall

3644

Males

3343

M18-39

3343

24M→40K

24.0 - 24.9 mi

Top 13%
×1story
+6ft-20ft

Overall

3426

Males

3127

M18-39

3127

40K→25.2M

24.9 - 25.2 mi

Top 11%
×1story
+13ft-16ft

Overall

2955

Males

2710

M18-39

2710

25.2M→Finish

25.2 - 26.2 mi

Top 10%
×2stories
+22ft-21ft

Overall

2543

Males

2337

M18-39

2337

Passing Analysis

Category:
Athletes Passed
2029
Passed By
458
Net Change
+1571
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5310
5K → 10K226184+42#5310#5268
10K → 15K19045+145#5268#5123
15K → 20K25119+232#5123#4891
20K → Half1034-24#4891#4915
Half → 25K24513+232#4915#4683
25K → 30K3308+322#4683#4361
30K → 20M10723+84#4361#4277
20M → 21M2322+230#4277#4047
21M → 35K758+67#4047#3980
35K → 23M9220+72#3980#3908
23M → 24M5939+20#3908#3888
24M → 40K6833+35#3888#3853
40K → 25.2M419+32#3853#3821
25.2M → Finish10321+82#3821#3739
TOTALS2029458+1571
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing