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BOSTON MARATHON 2025

Sara Tsai

Bib: 3084•F

CO

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 11%
Gender (Female)
#0 / 12228
Top 2%
Division (F18-39)
#0 / 5469
Top 3%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:46
Rank: #2858
Start → 5K
19:46 | 6:22/mi
10K· 6.21 mi
38:53
Rank: #2174 (+684)
5K → 10K
19:07 | 6:09/mi
15K· 9.32 mi
57:51
Rank: #1880 (+294)
10K → 15K
18:58 | 6:06/mi
20K· 12.43 mi
1:16:54
Rank: #1713 (+167)
15K → 20K
19:03 | 6:08/mi
Half· 13.11 mi
1:21:05
Rank: #1700 (+13)
20K → Half
4:11 | 6:08/mi
25K· 15.53 mi
1:36:31
Rank: #1758 (-58)
Half → 25K
15:26 | 6:22/mi
30K· 18.64 mi
1:57:38
Rank: #1988 (-230)
25K → 30K
21:07 | 6:48/mi
20M
2:07:02
Rank: #2080 (-92)
30K → 20M
9:24 | 6:55/mi
21M
2:14:31
Rank: #2187 (-107)
20M → 21M
7:29 | 7:29/mi
35K· 21.75 mi
2:19:42
Rank: #2239 (-52)
21M → 35K
5:11 | 6:56/mi
23M
2:29:01
Rank: #2396 (-157)
35K → 23M
9:19 | 7:26/mi
24M
2:36:19
Rank: #2540 (-144)
23M → 24M
7:18 | 7:18/mi
40K· 24.85 mi
2:43:32
Rank: #2806 (-266)
24M → 40K
7:13 | 8:26/mi
25.2M
2:46:44
Rank: #2920 (-114)
40K → 25.2M
3:12 | 9:17/mi
Finish· 26.22 mi
2:54:55
Rank: #3225 (-305)
25.2M → Finish
8:11 | 8:02/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:21:05
Pace6:11 /mi
2nd Half
Distance13.11 mi
Time1:33:50
Pace7:09 /mi
📊Positive Split: 15.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:21:0419:466:2219:46
6:22
-
10K
6.21 mi10:40:1138:536:1519:07
6:09
-0:13
15K
9.32 mi10:59:0957:516:1218:58
6:06
-0:03
20K
12.43 mi11:18:121:16:546:1119:03
6:08
+0:02
Half
13.11 mi11:22:231:21:056:114:11
6:08
0:00
25K
15.53 mi11:37:491:36:316:1315:26
6:22
+0:14
30K
18.64 mi11:58:561:57:386:1921:07
6:48
+0:26
20M
20.00 mi12:08:202:07:026:219:24
6:55
+0:07
21M
21.00 mi12:15:492:14:316:247:29
7:29
+0:34
35K
21.75 mi12:21:002:19:426:255:11
6:56
-0:33
23M
23.00 mi12:30:192:29:016:299:19
7:26
+0:30
24M
24.00 mi12:37:372:36:196:317:18
7:18
-0:08
40K
24.85 mi12:44:502:43:326:357:13
8:26
+1:08
25.2M
25.20 mi12:48:022:46:446:373:12
9:17
+0:51
Finish
26.22 mi12:56:132:54:556:418:11
8:02
-1:15

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

6:06 /mi

Average Pace

6:41 /mi

Slowest Pace

9:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:36:31

55% of race

Time at Steady Pace

43:00

25% of race

Time at Slower Pace

35:24

20% of race

Average Pace: 6:40 /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 mi10:21:0419:466:2219:46
6:22
#2858
10K
6.21 mi10:40:1138:536:1519:07
6:09
#2174
15K
9.32 mi10:59:0957:516:1218:58
6:06
#1880
20K
12.43 mi11:18:121:16:546:1119:03
6:08
#1713
Half
13.11 mi11:22:231:21:056:114:11
6:08
#1700
25K
15.53 mi11:37:491:36:316:1315:26
6:22
#1758
30K
18.64 mi11:58:561:57:386:1921:07
6:48
#1988
20M
20.00 mi12:08:202:07:026:219:24
6:55
#2080
21M
21.00 mi12:15:492:14:316:247:29
7:29
#2187
35K
21.75 mi12:21:002:19:426:255:11
6:56
#2239
23M
23.00 mi12:30:192:29:016:299:19
7:26
#2396
24M
24.00 mi12:37:372:36:196:317:18
7:18
#2540
40K
24.85 mi12:44:502:43:326:357:13
8:26
#2806
25.2M
25.20 mi12:48:022:46:446:373:12
9:17
#2920
Finish
26.22 mi12:56:132:54:556:418:11
8:02
#3225
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi28581311311419(Top 5%)63(Top 0.5%)63(Top 1%)
10K6.21 mi3.10 mi2174+68493+3893+381695(Top 6%)76(Top 0.6%)76(Top 1%)
15K9.32 mi3.11 mi1880+29486+786+71419(Top 5%)63(Top 0.5%)63(Top 1%)
20K12.43 mi3.11 mi1713+16779+779+71293(Top 5%)63(Top 0.5%)63(Top 1%)
Half13.11 mi0.68 mi1700+1379791713(Top 6%)77(Top 0.6%)77(Top 1%)
25K15.53 mi2.42 mi1758-5881-281-22199(Top 8%)100(Top 0.8%)100(Top 2%)
30K18.64 mi3.11 mi1988-23089-889-83441(Top 12%)225(Top 2%)225(Top 4%)
20M20.00 mi1.36 mi2080-9293-493-43638(Top 13%)273(Top 2%)273(Top 5%)
21M21.00 mi1.00 mi2187-10795-295-24561(Top 16%)497(Top 4%)497(Top 9%)
35K21.75 mi0.75 mi2239-5298-398-34946(Top 17%)577(Top 5%)577(Top 11%)
23M23.00 mi1.25 mi2396-157108-10108-106310(Top 22%)1128(Top 9%)1128(Top 21%)
24M24.00 mi1.00 mi2540-144121-13121-136432(Top 23%)1229(Top 10%)1229(Top 22%)
40K24.85 mi0.85 mi2806-266141-20141-2013042(Top 46%)4453(Top 36%)4453(Top 81%)
25.2M25.20 mi0.35 mi2920-114154-13154-1313347(Top 47%)4656(Top 38%)4656(Top 85%)
Finish26.22 mi1.02 mi3225-305188-34188-3413076(Top 46%)4464(Top 37%)4464(Top 82%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 5%
×21stories
+97ft-345ft

Overall

1419

Females

63

F18-39

63

5K→10K

3.1 - 6.2 mi

Top 6%
×5stories
+79ft-138ft

Overall

1695

Females

76

F18-39

76

10K→15K

6.2 - 9.3 mi

Top 5%
×3stories
+67ft-78ft

Overall

1419

Females

63

F18-39

63

15K→20K

9.3 - 12.4 mi

Top 5%
×5stories
+106ft-86ft

Overall

1293

Females

63

F18-39

63

20K→Half

12.4 - 13.1 mi

Top 6%
×2stories
+19ft-37ft

Overall

1713

Females

77

F18-39

77

Half→25K

13.1 - 15.5 mi

Top 8%
×4stories
+66ft-88ft

Overall

2199

Females

100

F18-39

100

25K→30K

15.5 - 18.6 mi

Top 12%
×9stories
+181ft-148ft

Overall

3441

Females

225

F18-39

225

30K→20M

18.6 - 20.0 mi

Top 13%
×5stories
+64ft-50ft

Overall

3638

Females

273

F18-39

273

20M→21M

20.0 - 21.0 mi

Top 16%
×8stories
+106ft-24ft

Overall

4561

Females

497

F18-39

497

21M→35K

21.0 - 21.8 mi

Top 17%
×7stories
+17ft-86ft

Overall

4946

Females

577

F18-39

577

35K→23M

21.8 - 23.0 mi

Top 22%
×5stories
+23ft-63ft

Overall

6310

Females

1128

F18-39

1128

23M→24M

23.0 - 24.0 mi

Top 23%
×6stories
+12ft-82ft

Overall

6432

Females

1229

F18-39

1229

24M→40K

24.0 - 24.9 mi

Top 46%
×1story
+6ft-20ft

Overall

13042

Females

4453

F18-39

4453

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13347

Females

4656

F18-39

4656

25.2M→Finish

25.2 - 26.2 mi

Top 46%
×2stories
+22ft-21ft

Overall

13076

Females

4464

F18-39

4464

Passing Analysis

Category:
Athletes Passed
1329
Passed By
1696
Net Change
-367
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2858
5K → 10K6873+684#2858#2174
10K → 15K2951+294#2174#1880
15K → 20K1725+167#1880#1713
20K → Half163+13#1713#1700
Half → 25K3694-58#1700#1758
25K → 30K32262-230#1758#1988
30K → 20M17109-92#1988#2080
20M → 21M17124-107#2080#2187
21M → 35K1062-52#2187#2239
35K → 23M20177-157#2239#2396
23M → 24M19163-144#2396#2540
24M → 40K3269-266#2540#2806
40K → 25.2M1115-114#2806#2920
25.2M → Finish4309-305#2920#3225
TOTALS13291696-367
📊

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