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BOSTON MARATHON 2025

Guangkai Ji

Bib: 9392•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 33%
Gender (Male)
#0 / 16105
Top 46%
Masters (Masters Men)
#0 / 10463
Top 34%
Division (M40-44)
#0 / 2247
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
7:09/mi
22:14
↑ 97↓ 3451.5%
10K· 6.21 mi
7:11/mi
44:32
↑ 79↓ 1380.4%
15K· 9.32 mi
7:12/mi
1:06:53
↑ 67↓ 78
20K· 12.43 mi
7:25/mi
1:29:54
↑ 106↓ 860.1%
Half· 13.11 mi
7:14/mi
1:34:50
↑ 19↓ 370.5%
25K· 15.53 mi
7:22/mi
1:52:42
↑ 66↓ 880.2%
30K· 18.64 mi
7:49/mi
2:16:59
↑ 181↓ 1480.2%
20M
7:57/mi
2:27:47
↑ 64↓ 500.2%
21M
8:28/mi
2:36:15
↑ 106↓ 241.6%
35K· 21.75 mi
7:36/mi
2:41:56
↑ 17↓ 861.7%
23M
7:56/mi
2:51:52
↑ 23↓ 630.6%
24M
7:53/mi
2:59:45
↓ 821.3%
40K· 24.85 mi
7:53/mi
3:06:29
↓ 200.3%
25.2M
8:42/mi
3:09:29
↑ 13↓ 160.2%
Finish· 26.22 mi
7:45/mi
3:17:23
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:34:50
Pace7:14 /mi
2nd Half
Distance13.11 mi
Time1:42:33
Pace7:49 /mi
📊Positive Split: 8.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:1522:147:0922:14
7:09
-
10K
6.21 mi11:15:3344:327:1022:18
7:11
+0:02
15K
9.32 mi11:37:541:06:537:1122:21
7:12
+0:01
20K
12.43 mi12:00:551:29:547:1423:01
7:25
+0:13
Half
13.11 mi12:05:511:34:507:144:56
7:14
-0:11
25K
15.53 mi12:23:431:52:427:1517:52
7:22
+0:08
30K
18.64 mi12:48:002:16:597:2124:17
7:49
+0:27
20M
20.00 mi12:58:482:27:477:2310:48
7:57
+0:08
21M
21.00 mi13:07:162:36:157:268:28
8:28
+0:31
35K
21.75 mi13:12:572:41:567:275:41
7:36
-0:52
23M
23.00 mi13:22:532:51:527:289:56
7:56
+0:20
24M
24.00 mi13:30:462:59:457:297:53
7:53
-0:03
40K
24.85 mi13:37:303:06:297:306:44
7:53
0:00
25.2M
25.20 mi13:40:303:09:297:313:00
8:42
+0:49
Finish
26.22 mi13:48:243:17:237:327:54
7:45
-0:57

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

7:09 /mi

Average Pace

7:32 /mi

Slowest Pace

8:42 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:52:42

57% of race

Time at Steady Pace

1:13:13

37% of race

Time at Slower Pace

11:28

6% of race

Average Pace: 7:32 /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 mi10:53:1522:147:0922:14
7:09
#9107
10K
6.21 mi11:15:3344:327:1022:18
7:11
#9165
15K
9.32 mi11:37:541:06:537:1122:21
7:12
#9122
20K
12.43 mi12:00:551:29:547:1423:01
7:25
#9290
Half
13.11 mi12:05:511:34:507:144:56
7:14
#9292
25K
15.53 mi12:23:431:52:427:1517:52
7:22
#9173
30K
18.64 mi12:48:002:16:597:2124:17
7:49
#9264
20M
20.00 mi12:58:482:27:477:2310:48
7:57
#9300
21M
21.00 mi13:07:162:36:157:268:28
8:28
#9318
35K
21.75 mi13:12:572:41:567:275:41
7:36
#9298
23M
23.00 mi13:22:532:51:527:289:56
7:56
#9252
24M
24.00 mi13:30:462:59:457:297:53
7:53
#9302
40K
24.85 mi13:37:303:06:297:306:44
7:53
#9258
25.2M
25.20 mi13:40:303:09:297:313:00
8:42
#9258
Finish
26.22 mi13:48:243:17:237:327:54
7:45
#9326
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi9107767876789051(Top 32%)7579(Top 47%)7579(Top 337%)
10K6.21 mi3.10 mi9165-587697-197697-199291(Top 33%)7763(Top 48%)7763(Top 345%)
15K9.32 mi3.11 mi9122+437655+427655+429051(Top 32%)7579(Top 47%)7579(Top 337%)
20K12.43 mi3.11 mi9290-1687726-717726-719963(Top 35%)7989(Top 50%)7989(Top 356%)
Half13.11 mi0.68 mi9292-27723+37723+39309(Top 33%)7652(Top 48%)7652(Top 341%)
25K15.53 mi2.42 mi9173+1197616+1077616+1078887(Top 31%)7276(Top 45%)7276(Top 324%)
30K18.64 mi3.11 mi9264-917613+37613+310062(Top 35%)7716(Top 48%)7716(Top 343%)
20M20.00 mi1.36 mi9300-367601+127601+1210064(Top 35%)7574(Top 47%)7574(Top 337%)
21M21.00 mi1.00 mi9318-187574+277574+2710220(Top 36%)7470(Top 46%)7470(Top 332%)
35K21.75 mi0.75 mi9298+207542+327542+329289(Top 33%)6995(Top 43%)6995(Top 311%)
23M23.00 mi1.25 mi9252+467478+647478+649513(Top 33%)6984(Top 43%)6984(Top 311%)
24M24.00 mi1.00 mi9302-507477+17477+110414(Top 37%)7381(Top 46%)7381(Top 328%)
40K24.85 mi0.85 mi9258+447413+647413+649276(Top 33%)6669(Top 41%)6669(Top 297%)
25.2M25.20 mi0.35 mi92587392+217392+219936(Top 35%)6912(Top 43%)6912(Top 308%)
Finish26.22 mi1.02 mi9326-687396-47396-411053(Top 39%)7530(Top 47%)7530(Top 335%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 32%
×21story building
+97ft-345ft

Overall

9051

Males

7579

M40-44

7579

5K→10K

3.1 - 6.2 mi

Top 33%
×5story building
+79ft-138ft

Overall

9291

Males

7763

M40-44

7763

10K→15K

6.2 - 9.3 mi

Top 32%
×3story building
+67ft-78ft

Overall

9051

Males

7579

M40-44

7579

15K→20K

9.3 - 12.4 mi

Top 35%
×5story building
+106ft-86ft

Overall

9963

Males

7989

M40-44

7989

20K→Half

12.4 - 13.1 mi

Top 33%
×2story building
+19ft-37ft

Overall

9309

Males

7652

M40-44

7652

Half→25K

13.1 - 15.5 mi

Top 31%
×4story building
+66ft-88ft

Overall

8887

Males

7276

M40-44

7276

25K→30K

15.5 - 18.6 mi

Top 35%
×9story building
+181ft-148ft

Overall

10062

Males

7716

M40-44

7716

30K→20M

18.6 - 20.0 mi

Top 35%
×5story building
+64ft-50ft

Overall

10064

Males

7574

M40-44

7574

20M→21M

20.0 - 21.0 mi

Top 36%
×8story building
+106ft-24ft

Overall

10220

Males

7470

M40-44

7470

21M→35K

21.0 - 21.8 mi

Top 33%
×7story building
+17ft-86ft

Overall

9289

Males

6995

M40-44

6995

35K→23M

21.8 - 23.0 mi

Top 33%
×5story building
+23ft-63ft

Overall

9513

Males

6984

M40-44

6984

23M→24M

23.0 - 24.0 mi

Top 37%
×6story building
+12ft-82ft

Overall

10414

Males

7381

M40-44

7381

24M→40K

24.0 - 24.9 mi

Top 33%
×1story
+6ft-20ft

Overall

9276

Males

6669

M40-44

6669

40K→25.2M

24.9 - 25.2 mi

Top 35%
×1story
+13ft-16ft

Overall

9936

Males

6912

M40-44

6912

25.2M→Finish

25.2 - 26.2 mi

Top 39%
×2story building
+22ft-21ft

Overall

11053

Males

7530

M40-44

7530

Passing Analysis

Category:
Athletes Passed
1558
Passed By
1777
Net Change
-219
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9107
5K → 10K203261-58#9107#9165
10K → 15K180137+43#9165#9122
15K → 20K122290-168#9122#9290
20K → Half2527-2#9290#9292
Half → 25K21091+119#9292#9173
25K → 30K198289-91#9173#9264
30K → 20M86122-36#9264#9300
20M → 21M85103-18#9300#9318
21M → 35K7151+20#9318#9298
35K → 23M12882+46#9298#9252
23M → 24M69119-50#9252#9302
24M → 40K10056+44#9302#9258
40K → 25.2M33330#9258#9258
25.2M → Finish48116-68#9258#9326
TOTALS15581777-219
📊

Passing Visuals

Category:
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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