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BOSTON MARATHON 2025

Eldon Tsoi

Bib: 30522•M

IL

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
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
38:54
Rank: #28338
Start → 5K
38:54 | 12:31/mi
10K· 6.21 mi
1:18:26
Rank: #28319 (+19)
5K → 10K
39:32 | 12:43/mi
15K· 9.32 mi
1:57:18
Rank: #28257 (+62)
10K → 15K
38:52 | 12:31/mi
20K· 12.43 mi
2:37:02
Rank: #28173 (+84)
15K → 20K
39:44 | 12:47/mi
Half· 13.11 mi
2:45:41
Rank: #28159 (+14)
20K → Half
8:39 | 12:41/mi
25K· 15.53 mi
3:17:07
Rank: #28069 (+90)
Half → 25K
31:26 | 12:58/mi
30K· 18.64 mi
3:59:20
Rank: #27960 (+109)
25K → 30K
42:13 | 13:35/mi
20M
4:18:11
Rank: #27934 (+26)
30K → 20M
18:51 | 13:52/mi
21M
4:31:41
Rank: #27866 (+68)
20M → 21M
13:30 | 13:30/mi
35K· 21.75 mi
4:39:40
Rank: #27778 (+88)
21M → 35K
7:59 | 10:40/mi
23M
4:54:55
Rank: #27682 (+96)
35K → 23M
15:15 | 12:11/mi
24M
5:07:47
Rank: #27662 (+20)
23M → 24M
12:52 | 12:52/mi
40K· 24.85 mi
5:19:16
Rank: #27638 (+24)
24M → 40K
11:29 | 13:26/mi
25.2M
5:23:53
Rank: #27620 (+18)
40K → 25.2M
4:37 | 13:23/mi
Finish· 26.22 mi
5:35:19
Rank: #27590 (+30)
25.2M → Finish
11:26 | 11:13/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:45:41
Pace12:38 /mi
2nd Half
Distance13.11 mi
Time2:49:38
Pace12:56 /mi
📊Positive Split: 2.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi12:00:5038:5412:3138:54
12:31
-
10K
6.21 mi12:40:221:18:2612:3739:32
12:43
+0:12
15K
9.32 mi13:19:141:57:1812:3538:52
12:31
-0:12
20K
12.43 mi13:58:582:37:0212:3839:44
12:47
+0:16
Half
13.11 mi14:07:372:45:4112:388:39
12:41
-0:06
25K
15.53 mi14:39:033:17:0712:4131:26
12:58
+0:17
30K
18.64 mi15:21:163:59:2012:5042:13
13:35
+0:37
20M
20.00 mi15:40:074:18:1112:5518:51
13:52
+0:17
21M
21.00 mi15:53:374:31:4112:5613:30
13:30
-0:22
35K
21.75 mi16:01:364:39:4012:527:59
10:40
-2:50
23M
23.00 mi16:16:514:54:5512:4915:15
12:11
+1:31
24M
24.00 mi16:29:435:07:4712:4912:52
12:52
+0:41
40K
24.85 mi16:41:125:19:1612:5111:29
13:26
+0:34
25.2M
25.20 mi16:45:495:23:5312:514:37
13:23
-0:03
Finish
26.22 mi16:57:155:35:1912:4811:26
11:13
-2:10

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

10:40 /mi

Average Pace

12:48 /mi

Slowest Pace

13:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

34:40

10% of race

Time at Steady Pace

3:29:59

63% of race

Time at Slower Pace

1:30:40

27% of race

Average Pace: 12:47 /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 mi12:00:5038:5412:3138:54
12:31
#28338
10K
6.21 mi12:40:221:18:2612:3739:32
12:43
#28319
15K
9.32 mi13:19:141:57:1812:3538:52
12:31
#28257
20K
12.43 mi13:58:582:37:0212:3839:44
12:47
#28173
Half
13.11 mi14:07:372:45:4112:388:39
12:41
#28159
25K
15.53 mi14:39:033:17:0712:4131:26
12:58
#28069
30K
18.64 mi15:21:163:59:2012:5042:13
13:35
#27960
20M
20.00 mi15:40:074:18:1112:5518:51
13:52
#27934
21M
21.00 mi15:53:374:31:4112:5613:30
13:30
#27866
35K
21.75 mi16:01:364:39:4012:527:59
10:40
#27778
23M
23.00 mi16:16:514:54:5512:4915:15
12:11
#27682
24M
24.00 mi16:29:435:07:4712:4912:52
12:52
#27662
40K
24.85 mi16:41:125:19:1612:5111:29
13:26
#27638
25.2M
25.20 mi16:45:495:23:5312:514:37
13:23
#27620
Finish
26.22 mi16:57:155:35:1912:4811:26
11:13
#27590
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi28338160831608327937(Top 98%)15930(Top 99%)15930(Top 282%)
10K6.21 mi3.10 mi28319+1916074+916074+928266(Top 100%)16048(Top 100%)16048(Top 284%)
15K9.32 mi3.11 mi28257+6216048+2616048+2627937(Top 98%)15930(Top 99%)15930(Top 282%)
20K12.43 mi3.11 mi28173+8416019+2916019+2927705(Top 98%)15818(Top 98%)15818(Top 280%)
Half13.11 mi0.68 mi28159+1416014+516014+527853(Top 98%)15867(Top 99%)15867(Top 281%)
25K15.53 mi2.42 mi28069+9015982+3215982+3227271(Top 96%)15623(Top 97%)15623(Top 277%)
30K18.64 mi3.11 mi27960+10915927+5515927+5527194(Top 96%)15523(Top 96%)15523(Top 275%)
20M20.00 mi1.36 mi27934+2615909+1815909+1827194(Top 96%)15465(Top 96%)15465(Top 274%)
21M21.00 mi1.00 mi27866+6815874+3515874+3525671(Top 90%)14716(Top 91%)14716(Top 261%)
35K21.75 mi0.75 mi27778+8815834+4015834+4023530(Top 83%)13658(Top 85%)13658(Top 242%)
23M23.00 mi1.25 mi27682+9615790+4415790+4425367(Top 89%)14519(Top 90%)14519(Top 257%)
24M24.00 mi1.00 mi27662+2015772+1815772+1826706(Top 94%)15157(Top 94%)15157(Top 269%)
40K24.85 mi0.85 mi27638+2415756+1615756+1626715(Top 94%)15143(Top 94%)15143(Top 268%)
25.2M25.20 mi0.35 mi27620+1815747+915747+925545(Top 90%)14515(Top 90%)14515(Top 257%)
Finish26.22 mi1.02 mi27590+3015731+1615731+1625744(Top 91%)14659(Top 91%)14659(Top 260%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 98%
×21stories
+97ft-345ft

Overall

27937

Males

15930

M18-39

15930

5K→10K

3.1 - 6.2 mi

Top 100%
×5stories
+79ft-138ft

Overall

28266

Males

16048

M18-39

16048

10K→15K

6.2 - 9.3 mi

Top 98%
×3stories
+67ft-78ft

Overall

27937

Males

15930

M18-39

15930

15K→20K

9.3 - 12.4 mi

Top 98%
×5stories
+106ft-86ft

Overall

27705

Males

15818

M18-39

15818

20K→Half

12.4 - 13.1 mi

Top 98%
×2stories
+19ft-37ft

Overall

27853

Males

15867

M18-39

15867

Half→25K

13.1 - 15.5 mi

Top 96%
×4stories
+66ft-88ft

Overall

27271

Males

15623

M18-39

15623

25K→30K

15.5 - 18.6 mi

Top 96%
×9stories
+181ft-148ft

Overall

27194

Males

15523

M18-39

15523

30K→20M

18.6 - 20.0 mi

Top 96%
×5stories
+64ft-50ft

Overall

27194

Males

15465

M18-39

15465

20M→21M

20.0 - 21.0 mi

Top 90%
×8stories
+106ft-24ft

Overall

25671

Males

14716

M18-39

14716

21M→35K

21.0 - 21.8 mi

Top 83%
×7stories
+17ft-86ft

Overall

23530

Males

13658

M18-39

13658

35K→23M

21.8 - 23.0 mi

Top 89%
×5stories
+23ft-63ft

Overall

25367

Males

14519

M18-39

14519

23M→24M

23.0 - 24.0 mi

Top 94%
×6stories
+12ft-82ft

Overall

26706

Males

15157

M18-39

15157

24M→40K

24.0 - 24.9 mi

Top 94%
×1story
+6ft-20ft

Overall

26715

Males

15143

M18-39

15143

40K→25.2M

24.9 - 25.2 mi

Top 90%
×1story
+13ft-16ft

Overall

25545

Males

14515

M18-39

14515

25.2M→Finish

25.2 - 26.2 mi

Top 91%
×2stories
+22ft-21ft

Overall

25744

Males

14659

M18-39

14659

Passing Analysis

Category:
Athletes Passed
807
Passed By
59
Net Change
+748
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#28338
5K → 10K2910+19#28338#28319
10K → 15K642+62#28319#28257
15K → 20K873+84#28257#28173
20K → Half228+14#28173#28159
Half → 25K922+90#28159#28069
25K → 30K1145+109#28069#27960
30K → 20M3610+26#27960#27934
20M → 21M702+68#27934#27866
21M → 35K880+88#27866#27778
35K → 23M971+96#27778#27682
23M → 24M288+20#27682#27662
24M → 40K306+24#27662#27638
40K → 25.2M180+18#27638#27620
25.2M → Finish322+30#27620#27590
TOTALS80759+748
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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