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BOSTON MARATHON 2025

Xuesong Bai

Bib: 18805•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M55-59)
#0 / 1648
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
7:53/mi
24:30
↑ 97↓ 3451.5%
10K· 6.21 mi
7:54/mi
49:03
↑ 79↓ 1380.4%
15K· 9.32 mi
8:06/mi
1:14:14
↑ 67↓ 78
20K· 12.43 mi
8:31/mi
1:40:43
↑ 106↓ 860.1%
Half· 13.11 mi
8:42/mi
1:46:39
↑ 19↓ 370.5%
25K· 15.53 mi
9:16/mi
2:09:06
↑ 66↓ 880.2%
30K· 18.64 mi
10:14/mi
2:40:55
↑ 181↓ 1480.2%
20M
10:39/mi
2:55:24
↑ 64↓ 500.2%
21M
11:45/mi
3:07:09
↑ 106↓ 241.6%
35K· 21.75 mi
10:23/mi
3:14:55
↑ 17↓ 861.7%
23M
10:35/mi
3:28:10
↑ 23↓ 630.6%
24M
10:33/mi
3:38:43
↓ 821.3%
40K· 24.85 mi
11:02/mi
3:48:09
↓ 200.3%
25.2M
12:05/mi
3:52:19
↑ 13↓ 160.2%
Finish· 26.22 mi
10:51/mi
4:03:22
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:39
Pace8:08 /mi
2nd Half
Distance13.11 mi
Time2:16:43
Pace10:26 /mi
📊Positive Split: 28.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:4724:307:5324:30
7:53
-
10K
6.21 mi11:40:2049:037:5424:33
7:54
+0:01
15K
9.32 mi12:05:311:14:147:5825:11
8:06
+0:12
20K
12.43 mi12:32:001:40:438:0626:29
8:31
+0:25
Half
13.11 mi12:37:561:46:398:085:56
8:42
+0:11
25K
15.53 mi13:00:232:09:068:1922:27
9:16
+0:34
30K
18.64 mi13:32:122:40:558:3831:49
10:14
+0:58
20M
20.00 mi13:46:412:55:248:4614:29
10:39
+0:25
21M
21.00 mi13:58:263:07:098:5511:45
11:45
+1:06
35K
21.75 mi14:06:123:14:558:587:46
10:23
-1:22
23M
23.00 mi14:19:273:28:109:0313:15
10:35
+0:12
24M
24.00 mi14:30:003:38:439:0710:33
10:33
-0:02
40K
24.85 mi14:39:263:48:099:119:26
11:02
+0:29
25.2M
25.20 mi14:43:363:52:199:134:10
12:05
+1:03
Finish
26.22 mi14:54:394:03:229:1711:03
10:51
-1:14

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

7:53 /mi

Average Pace

9:17 /mi

Slowest Pace

12:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:09:06

53% of race

Time at Steady Pace

1:38:21

40% of race

Time at Slower Pace

15:55

7% of race

Average Pace: 9:17 /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 mi11:15:4724:307:5324:30
7:53
#15545
10K
6.21 mi11:40:2049:037:5424:33
7:54
#15618
15K
9.32 mi12:05:311:14:147:5825:11
8:06
#16044
20K
12.43 mi12:32:001:40:438:0626:29
8:31
#16715
Half
13.11 mi12:37:561:46:398:085:56
8:42
#16929
25K
15.53 mi13:00:232:09:068:1922:27
9:16
#17648
30K
18.64 mi13:32:122:40:558:3831:49
10:14
#18932
20M
20.00 mi13:46:412:55:248:4614:29
10:39
#19403
21M
21.00 mi13:58:263:07:098:5511:45
11:45
#19759
35K
21.75 mi14:06:123:14:558:587:46
10:23
#19936
23M
23.00 mi14:19:273:28:109:0313:15
10:35
#20146
24M
24.00 mi14:30:003:38:439:0710:33
10:33
#20351
40K
24.85 mi14:39:263:48:099:119:26
11:02
#20529
25.2M
25.20 mi14:43:363:52:199:134:10
12:05
#20610
Finish
26.22 mi14:54:394:03:229:1711:03
10:51
#20810
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi15545106451064516772(Top 59%)11132(Top 69%)11132(Top 675%)
10K6.21 mi3.10 mi15618-7310668-2310668-2315673(Top 55%)10703(Top 66%)10703(Top 649%)
15K9.32 mi3.11 mi16044-42610830-16210830-16216772(Top 59%)11132(Top 69%)11132(Top 675%)
20K12.43 mi3.11 mi16715-67111103-27311103-27318397(Top 65%)11784(Top 73%)11784(Top 715%)
Half13.11 mi0.68 mi16929-21411181-7811181-7820313(Top 72%)12605(Top 78%)12605(Top 765%)
25K15.53 mi2.42 mi17648-71911451-27011451-27021001(Top 74%)12844(Top 80%)12844(Top 779%)
30K18.64 mi3.11 mi18932-128411970-51911970-51922285(Top 78%)13291(Top 83%)13291(Top 806%)
20M20.00 mi1.36 mi19403-47112142-17212142-17222840(Top 80%)13442(Top 83%)13442(Top 816%)
21M21.00 mi1.00 mi19759-35612271-12912271-12923117(Top 81%)13508(Top 84%)13508(Top 820%)
35K21.75 mi0.75 mi19936-17712329-5812329-5822889(Top 81%)13335(Top 83%)13335(Top 809%)
23M23.00 mi1.25 mi20146-21012391-6212391-6222205(Top 78%)12975(Top 81%)12975(Top 787%)
24M24.00 mi1.00 mi20351-20512473-8212473-8222947(Top 81%)13279(Top 82%)13279(Top 806%)
40K24.85 mi0.85 mi20529-17812538-6512538-6523209(Top 82%)13336(Top 83%)13336(Top 809%)
25.2M25.20 mi0.35 mi20610-8112562-2412562-2423375(Top 82%)13455(Top 84%)13455(Top 816%)
Finish26.22 mi1.02 mi20810-20012633-7112633-7125036(Top 88%)14293(Top 89%)14293(Top 867%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 59%
×21story building
+97ft-345ft

Overall

16772

Males

11132

M55-59

11132

5K→10K

3.1 - 6.2 mi

Top 55%
×5story building
+79ft-138ft

Overall

15673

Males

10703

M55-59

10703

10K→15K

6.2 - 9.3 mi

Top 59%
×3story building
+67ft-78ft

Overall

16772

Males

11132

M55-59

11132

15K→20K

9.3 - 12.4 mi

Top 65%
×5story building
+106ft-86ft

Overall

18397

Males

11784

M55-59

11784

20K→Half

12.4 - 13.1 mi

Top 72%
×2story building
+19ft-37ft

Overall

20313

Males

12605

M55-59

12605

Half→25K

13.1 - 15.5 mi

Top 74%
×4story building
+66ft-88ft

Overall

21001

Males

12844

M55-59

12844

25K→30K

15.5 - 18.6 mi

Top 78%
×9story building
+181ft-148ft

Overall

22285

Males

13291

M55-59

13291

30K→20M

18.6 - 20.0 mi

Top 80%
×5story building
+64ft-50ft

Overall

22840

Males

13442

M55-59

13442

20M→21M

20.0 - 21.0 mi

Top 81%
×8story building
+106ft-24ft

Overall

23117

Males

13508

M55-59

13508

21M→35K

21.0 - 21.8 mi

Top 81%
×7story building
+17ft-86ft

Overall

22889

Males

13335

M55-59

13335

35K→23M

21.8 - 23.0 mi

Top 78%
×5story building
+23ft-63ft

Overall

22205

Males

12975

M55-59

12975

23M→24M

23.0 - 24.0 mi

Top 81%
×6story building
+12ft-82ft

Overall

22947

Males

13279

M55-59

13279

24M→40K

24.0 - 24.9 mi

Top 82%
×1story
+6ft-20ft

Overall

23209

Males

13336

M55-59

13336

40K→25.2M

24.9 - 25.2 mi

Top 82%
×1story
+13ft-16ft

Overall

23375

Males

13455

M55-59

13455

25.2M→Finish

25.2 - 26.2 mi

Top 88%
×2story building
+22ft-21ft

Overall

25036

Males

14293

M55-59

14293

Passing Analysis

Category:
Athletes Passed
702
Passed By
5967
Net Change
-5265
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15545
5K → 10K289362-73#15545#15618
10K → 15K93519-426#15618#16044
15K → 20K63734-671#16044#16715
20K → Half6220-214#16715#16929
Half → 25K47766-719#16929#17648
25K → 30K361320-1284#17648#18932
30K → 20M28499-471#18932#19403
20M → 21M30386-356#19403#19759
21M → 35K20197-177#19759#19936
35K → 23M35245-210#19936#20146
23M → 24M11216-205#20146#20351
24M → 40K26204-178#20351#20529
40K → 25.2M1091-81#20529#20610
25.2M → Finish8208-200#20610#20810
TOTALS7025967-5265
📊

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