Boston Marathon logo
BOSTON MARATHON 2025

Chwee (aka Justin) Chan

Bib: 21920•M

OK

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M60-64)
#0 / 1259
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
8:25/mi
26:10
↑ 97↓ 3451.5%
10K· 6.21 mi
8:21/mi
52:08
↑ 79↓ 1380.4%
15K· 9.32 mi
8:24/mi
1:18:14
↑ 67↓ 78
20K· 12.43 mi
8:39/mi
1:45:05
↑ 106↓ 860.1%
Half· 13.11 mi
8:40/mi
1:51:00
↑ 19↓ 370.5%
25K· 15.53 mi
8:51/mi
2:12:28
↑ 66↓ 880.2%
30K· 18.64 mi
10:21/mi
2:44:38
↑ 181↓ 1480.2%
20M
10:11/mi
2:58:28
↑ 64↓ 500.2%
21M
11:01/mi
3:09:29
↑ 106↓ 241.6%
35K· 21.75 mi
9:49/mi
3:16:50
↑ 17↓ 861.7%
23M
9:42/mi
3:28:59
↑ 23↓ 630.6%
24M
9:15/mi
3:38:14
↓ 821.3%
40K· 24.85 mi
9:40/mi
3:46:30
↓ 200.3%
25.2M
10:55/mi
3:50:16
↑ 13↓ 160.2%
Finish· 26.22 mi
8:59/mi
3:59:25
↑ 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
Time1:51:00
Pace8:28 /mi
2nd Half
Distance13.11 mi
Time2:08:25
Pace9:48 /mi
📊Positive Split: 15.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:20:5426:108:2526:10
8:25
-
10K
6.21 mi11:46:5252:088:2325:58
8:21
-0:04
15K
9.32 mi12:12:581:18:148:2426:06
8:24
+0:03
20K
12.43 mi12:39:491:45:058:2726:51
8:39
+0:15
Half
13.11 mi12:45:441:51:008:285:55
8:40
+0:01
25K
15.53 mi13:07:122:12:288:3221:28
8:51
+0:11
30K
18.64 mi13:39:222:44:388:5032:10
10:21
+1:30
20M
20.00 mi13:53:122:58:288:5513:50
10:11
-0:10
21M
21.00 mi14:04:133:09:299:0111:01
11:01
+0:50
35K
21.75 mi14:11:343:16:509:037:21
9:49
-1:12
23M
23.00 mi14:23:433:28:599:0512:09
9:42
-0:07
24M
24.00 mi14:32:583:38:149:069:15
9:15
-0:27
40K
24.85 mi14:41:143:46:309:078:16
9:40
+0:25
25.2M
25.20 mi14:45:003:50:169:083:46
10:55
+1:15
Finish
26.22 mi14:54:093:59:259:089:09
8:59
-1:56

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

8:21 /mi

Average Pace

9:08 /mi

Slowest Pace

11:01 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:51:00

46% of race

Time at Steady Pace

48:08

20% of race

Time at Slower Pace

1:20:17

34% of race

Average Pace: 9:08 /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 mi11:20:5426:108:2526:10
8:25
#19429
10K
6.21 mi11:46:5252:088:2325:58
8:21
#19179
15K
9.32 mi12:12:581:18:148:2426:06
8:24
#18985
20K
12.43 mi12:39:491:45:058:2726:51
8:39
#18985
Half
13.11 mi12:45:441:51:008:285:55
8:40
#19043
25K
15.53 mi13:07:122:12:288:3221:28
8:51
#19071
30K
18.64 mi13:39:222:44:388:5032:10
10:21
#20044
20M
20.00 mi13:53:122:58:288:5513:50
10:11
#20185
21M
21.00 mi14:04:133:09:299:0111:01
11:01
#20307
35K
21.75 mi14:11:343:16:509:037:21
9:49
#20342
23M
23.00 mi14:23:433:28:599:0512:09
9:42
#20305
24M
24.00 mi14:32:583:38:149:069:15
9:15
#20254
40K
24.85 mi14:41:143:46:309:078:16
9:40
#20236
25.2M
25.20 mi14:45:003:50:169:083:46
10:55
#20258
Finish
26.22 mi14:54:093:59:259:089:09
8:59
#20238
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM60-64Seg. OverallSeg. MalesSeg. M60-64
5K3.11 mi3.11 mi19429122181221818711(Top 66%)11931(Top 74%)11931(Top 948%)
10K6.21 mi3.10 mi19179+25012124+9412124+9418919(Top 67%)12032(Top 75%)12032(Top 956%)
15K9.32 mi3.11 mi18985+19412027+9712027+9718711(Top 66%)11931(Top 74%)11931(Top 948%)
20K12.43 mi3.11 mi1898512034-712034-719085(Top 67%)12070(Top 75%)12070(Top 959%)
Half13.11 mi0.68 mi19043-5812057-2312057-2320166(Top 71%)12534(Top 78%)12534(Top 996%)
25K15.53 mi2.42 mi19071-28120571205719211(Top 68%)12071(Top 75%)12071(Top 959%)
30K18.64 mi3.11 mi20044-97312439-38212439-38222595(Top 80%)13431(Top 83%)13431(Top 1067%)
20M20.00 mi1.36 mi20185-14112467-2812467-2821502(Top 76%)12815(Top 80%)12815(Top 1018%)
21M21.00 mi1.00 mi20307-12212501-3412501-3421437(Top 75%)12706(Top 79%)12706(Top 1009%)
35K21.75 mi0.75 mi20342-3512505-412505-421375(Top 75%)12608(Top 78%)12608(Top 1001%)
23M23.00 mi1.25 mi20305+3712462+4312462+4319447(Top 68%)11646(Top 72%)11646(Top 925%)
24M24.00 mi1.00 mi20254+5112416+4612416+4618576(Top 65%)11205(Top 70%)11205(Top 890%)
40K24.85 mi0.85 mi20236+1812393+2312393+2319347(Top 68%)11494(Top 71%)11494(Top 913%)
25.2M25.20 mi0.35 mi20258-2212402-912402-920363(Top 72%)11963(Top 74%)11963(Top 950%)
Finish26.22 mi1.02 mi20238+2012382+2012382+2018919(Top 67%)11319(Top 70%)11319(Top 899%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 66%
×21story building
+97ft-345ft

Overall

18711

Males

11931

M60-64

11931

5K→10K

3.1 - 6.2 mi

Top 67%
×5story building
+79ft-138ft

Overall

18919

Males

12032

M60-64

12032

10K→15K

6.2 - 9.3 mi

Top 66%
×3story building
+67ft-78ft

Overall

18711

Males

11931

M60-64

11931

15K→20K

9.3 - 12.4 mi

Top 67%
×5story building
+106ft-86ft

Overall

19085

Males

12070

M60-64

12070

20K→Half

12.4 - 13.1 mi

Top 71%
×2story building
+19ft-37ft

Overall

20166

Males

12534

M60-64

12534

Half→25K

13.1 - 15.5 mi

Top 68%
×4story building
+66ft-88ft

Overall

19211

Males

12071

M60-64

12071

25K→30K

15.5 - 18.6 mi

Top 80%
×9story building
+181ft-148ft

Overall

22595

Males

13431

M60-64

13431

30K→20M

18.6 - 20.0 mi

Top 76%
×5story building
+64ft-50ft

Overall

21502

Males

12815

M60-64

12815

20M→21M

20.0 - 21.0 mi

Top 75%
×8story building
+106ft-24ft

Overall

21437

Males

12706

M60-64

12706

21M→35K

21.0 - 21.8 mi

Top 75%
×7story building
+17ft-86ft

Overall

21375

Males

12608

M60-64

12608

35K→23M

21.8 - 23.0 mi

Top 68%
×5story building
+23ft-63ft

Overall

19447

Males

11646

M60-64

11646

23M→24M

23.0 - 24.0 mi

Top 65%
×6story building
+12ft-82ft

Overall

18576

Males

11205

M60-64

11205

24M→40K

24.0 - 24.9 mi

Top 68%
×1story
+6ft-20ft

Overall

19347

Males

11494

M60-64

11494

40K→25.2M

24.9 - 25.2 mi

Top 72%
×1story
+13ft-16ft

Overall

20363

Males

11963

M60-64

11963

25.2M→Finish

25.2 - 26.2 mi

Top 67%
×2story building
+22ft-21ft

Overall

18919

Males

11319

M60-64

11319

Passing Analysis

Category:
Athletes Passed
1644
Passed By
2453
Net Change
-809
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19429
5K → 10K408158+250#19429#19179
10K → 15K307113+194#19179#18985
15K → 20K2012010#18985#18985
20K → Half1472-58#18985#19043
Half → 25K161189-28#19043#19071
25K → 30K471020-973#19071#20044
30K → 20M65206-141#20044#20185
20M → 21M52174-122#20185#20307
21M → 35K4479-35#20307#20342
35K → 23M10568+37#20342#20305
23M → 24M7928+51#20305#20254
24M → 40K6850+18#20254#20236
40K → 25.2M2042-22#20236#20258
25.2M → Finish7353+20#20258#20238
TOTALS16442453-809
📊

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