Boston Marathon logo
BOSTON MARATHON 2025

Brian Tsau

Bib: 3068•M

NY

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 28404
Top 15%
Gender (Male)
#0 / 16105
Top 25%
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
18:17
Rank: #766
Start → 5K
18:17 | 5:53/mi
10K· 6.21 mi
36:37
Rank: #788 (-22)
5K → 10K
18:20 | 5:54/mi
15K· 9.32 mi
55:01
Rank: #799 (-11)
10K → 15K
18:24 | 5:55/mi
20K· 12.43 mi
1:13:50
Rank: #838 (-39)
15K → 20K
18:49 | 6:03/mi
Half· 13.11 mi
1:17:55
Rank: #851 (-13)
20K → Half
4:05 | 5:59/mi
25K· 15.53 mi
1:34:00
Rank: #1093 (-242)
Half → 25K
16:05 | 6:38/mi
30K· 18.64 mi
1:54:09
Rank: #1209 (-116)
25K → 30K
20:09 | 6:29/mi
20M
2:05:31
Rank: #1720 (-511)
30K → 20M
11:22 | 8:22/mi
21M
2:13:21
Rank: #1914 (-194)
20M → 21M
7:50 | 7:50/mi
35K· 21.75 mi
2:19:09
Rank: #2129 (-215)
21M → 35K
5:48 | 7:45/mi
23M
2:30:56
Rank: #2840 (-711)
35K → 23M
11:47 | 9:25/mi
24M
2:40:05
Rank: #3409 (-569)
23M → 24M
9:09 | 9:09/mi
40K· 24.85 mi
2:48:09
Rank: #3976 (-567)
24M → 40K
8:04 | 9:26/mi
25.2M
2:51:09
Rank: #4063 (-87)
40K → 25.2M
3:00 | 8:42/mi
Finish· 26.22 mi
2:58:59
Rank: #4338 (-275)
25.2M → Finish
7:50 | 7:41/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 HalfFaster
Distance13.11 mi
Time1:17:55
Pace5:57 /mi
2nd Half
Distance13.11 mi
Time1:41:04
Pace7:43 /mi
📊Positive Split: 29.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:19:5518:175:5318:17
5:53
-
10K
6.21 mi10:38:1536:375:5418:20
5:54
+0:01
15K
9.32 mi10:56:3955:015:5418:24
5:55
+0:01
20K
12.43 mi11:15:281:13:505:5618:49
6:03
+0:08
Half
13.11 mi11:19:331:17:555:574:05
5:59
-0:04
25K
15.53 mi11:35:381:34:006:0316:05
6:38
+0:39
30K
18.64 mi11:55:471:54:096:0720:09
6:29
-0:09
20M
20.00 mi12:07:092:05:316:1711:22
8:22
+1:53
21M
21.00 mi12:14:592:13:216:217:50
7:50
-0:32
35K
21.75 mi12:20:472:19:096:245:48
7:45
-0:05
23M
23.00 mi12:32:342:30:566:3411:47
9:25
+1:40
24M
24.00 mi12:41:432:40:056:409:09
9:09
-0:16
40K
24.85 mi12:49:472:48:096:468:04
9:26
+0:17
25.2M
25.20 mi12:52:472:51:096:483:00
8:42
-0:44
Finish
26.22 mi13:00:372:58:596:507:50
7:41
-1:01

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

5:53 /mi

Average Pace

6:50 /mi

Slowest Pace

9:26 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:09

64% of race

Time at Steady Pace

21:28

12% of race

Time at Slower Pace

43:22

24% of race

Average Pace: 6:50 /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 mi10:19:5518:175:5318:17
5:53
#766
10K
6.21 mi10:38:1536:375:5418:20
5:54
#788
15K
9.32 mi10:56:3955:015:5418:24
5:55
#799
20K
12.43 mi11:15:281:13:505:5618:49
6:03
#838
Half
13.11 mi11:19:331:17:555:574:05
5:59
#851
25K
15.53 mi11:35:381:34:006:0316:05
6:38
#1093
30K
18.64 mi11:55:471:54:096:0720:09
6:29
#1209
20M
20.00 mi12:07:092:05:316:1711:22
8:22
#1720
21M
21.00 mi12:14:592:13:216:217:50
7:50
#1914
35K
21.75 mi12:20:472:19:096:245:48
7:45
#2129
23M
23.00 mi12:32:342:30:566:3411:47
9:25
#2840
24M
24.00 mi12:41:432:40:056:409:09
9:09
#3409
40K
24.85 mi12:49:472:48:096:468:04
9:26
#3976
25.2M
25.20 mi12:52:472:51:096:483:00
8:42
#4063
Finish
26.22 mi13:00:372:58:596:507:50
7:41
#4338
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi766714714816(Top 3%)765(Top 5%)765(Top 14%)
10K6.21 mi3.10 mi788-22736-22736-22831(Top 3%)780(Top 5%)780(Top 14%)
15K9.32 mi3.11 mi799-11748-12748-12816(Top 3%)765(Top 5%)765(Top 14%)
20K12.43 mi3.11 mi838-39787-39787-391033(Top 4%)974(Top 6%)974(Top 17%)
Half13.11 mi0.68 mi851-13800-13800-131133(Top 4%)1075(Top 7%)1075(Top 19%)
25K15.53 mi2.42 mi1093-2421032-2321032-2323689(Top 13%)3468(Top 22%)3468(Top 61%)
30K18.64 mi3.11 mi1209-1161141-1091141-1091923(Top 7%)1832(Top 11%)1832(Top 32%)
20M20.00 mi1.36 mi1720-5111634-4931634-49312897(Top 45%)8940(Top 56%)8940(Top 158%)
21M21.00 mi1.00 mi1914-1941821-1871821-1876365(Top 22%)5301(Top 33%)5301(Top 94%)
35K21.75 mi0.75 mi2129-2152028-2072028-20710398(Top 37%)7552(Top 47%)7552(Top 134%)
23M23.00 mi1.25 mi2840-7112692-6642692-66418263(Top 64%)11096(Top 69%)11096(Top 197%)
24M24.00 mi1.00 mi3409-5693207-5153207-51518081(Top 64%)10949(Top 68%)10949(Top 194%)
40K24.85 mi0.85 mi3976-5673691-4843691-48418398(Top 65%)11005(Top 68%)11005(Top 195%)
25.2M25.20 mi0.35 mi4063-873757-663757-669907(Top 35%)6883(Top 43%)6883(Top 122%)
Finish26.22 mi1.02 mi4338-2753992-2353992-23510566(Top 37%)7274(Top 45%)7274(Top 129%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 3%
×21stories
+97ft-345ft

Overall

816

Males

765

M18-39

765

5K→10K

3.1 - 6.2 mi

Top 3%
×5stories
+79ft-138ft

Overall

831

Males

780

M18-39

780

10K→15K

6.2 - 9.3 mi

Top 3%
×3stories
+67ft-78ft

Overall

816

Males

765

M18-39

765

15K→20K

9.3 - 12.4 mi

Top 4%
×5stories
+106ft-86ft

Overall

1033

Males

974

M18-39

974

20K→Half

12.4 - 13.1 mi

Top 4%
×2stories
+19ft-37ft

Overall

1133

Males

1075

M18-39

1075

Half→25K

13.1 - 15.5 mi

Top 13%
×4stories
+66ft-88ft

Overall

3689

Males

3468

M18-39

3468

25K→30K

15.5 - 18.6 mi

Top 7%
×9stories
+181ft-148ft

Overall

1923

Males

1832

M18-39

1832

30K→20M

18.6 - 20.0 mi

Top 45%
×5stories
+64ft-50ft

Overall

12897

Males

8940

M18-39

8940

20M→21M

20.0 - 21.0 mi

Top 22%
×8stories
+106ft-24ft

Overall

6365

Males

5301

M18-39

5301

21M→35K

21.0 - 21.8 mi

Top 37%
×7stories
+17ft-86ft

Overall

10398

Males

7552

M18-39

7552

35K→23M

21.8 - 23.0 mi

Top 64%
×5stories
+23ft-63ft

Overall

18263

Males

11096

M18-39

11096

23M→24M

23.0 - 24.0 mi

Top 64%
×6stories
+12ft-82ft

Overall

18081

Males

10949

M18-39

10949

24M→40K

24.0 - 24.9 mi

Top 65%
×1story
+6ft-20ft

Overall

18398

Males

11005

M18-39

11005

40K→25.2M

24.9 - 25.2 mi

Top 35%
×1story
+13ft-16ft

Overall

9907

Males

6883

M18-39

6883

25.2M→Finish

25.2 - 26.2 mi

Top 37%
×2stories
+22ft-21ft

Overall

10566

Males

7274

M18-39

7274

Passing Analysis

Category:
Athletes Passed
139
Passed By
3711
Net Change
-3572
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#766
5K → 10K3254-22#766#788
10K → 15K2637-11#788#799
15K → 20K2160-39#799#838
20K → Half316-13#838#851
Half → 25K4246-242#851#1093
25K → 30K21137-116#1093#1209
30K → 20M0511-511#1209#1720
20M → 21M6200-194#1720#1914
21M → 35K8223-215#1914#2129
35K → 23M2713-711#2129#2840
23M → 24M3572-569#2840#3409
24M → 40K2569-567#3409#3976
40K → 25.2M693-87#3976#4063
25.2M → Finish5280-275#4063#4338
TOTALS1393711-3572
📊

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