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Stefan Kozlov

01/02/1998 · right-handed

Global Elo

1617

Record

39-76

ATP / Tour Record

Wins
39
Losses
76
Matches
115

Challenger Record

Wins
219
Losses
161
Matches
380

Elo and Record by Surface

Clay 1615
Wins
3
Losses
6
Matches
9

Challenger

Wins
49
Losses
38
Matches
87
Hard 1581
Wins
25
Losses
55
Matches
80

Challenger

Wins
165
Losses
115
Matches
280
Grass 1518
Wins
11
Losses
15
Matches
26

Challenger

Wins
5
Losses
8
Matches
13

Elo Over Time

1818 1472
2013-07-08 2026-09-22 · 1624

495 matches in this range.

Performance vs. the Odds

Career record grouped by how big a favorite the market made Stefan Kozlov, based on their average odds.

Heavy favorite (odds below 1.30) 1W–0L · 100.0%
Favorite (odds 1.30-1.80) 1W–2L · 33.3%
Even match (odds 1.80-2.20) 1W–1L · 50.0%
Underdog (odds 2.20-4.00) 1W–3L · 25.0%
Heavy underdog (odds above 4.00) 1W–2L · 33.3%

13 matches with market odds since 2026-07-05.

Serve & Return

Serve and return win rates from the last 10 matches at the selected level.

1st Serve In % 64.3%
1st Serve Points Won % 53.1%
2nd Serve Points Won % 38.9%
Return Points Won vs 1st Serve % 35.1%
Return Points Won vs 2nd Serve % 50.8%
Aces per Service Game 0.12
Double Faults per Service Game 0.35

Based on the last 10 ATP/Grand Slam matches.

1st Serve In % 65.7%
1st Serve Points Won % 66.2%
2nd Serve Points Won % 51.6%
Return Points Won vs 1st Serve % 37.6%
Return Points Won vs 2nd Serve % 55.7%
Aces per Service Game 0.19
Double Faults per Service Game 0.25

Based on the last 10 Challenger matches.

Break Point Performance

How the player handles the biggest points, from the last 10 matches at the selected level.

Break Points Saved % 49.5%
Break Points Converted % 40.0%

Based on the last 10 ATP/Grand Slam matches.

Break Points Saved % 57.1%
Break Points Converted % 42.9%

Based on the last 10 Challenger matches.

Recent Matches

L Hard San Diego 2 challenger · 1. round · 2026-09-22

vs Colton Smith #205

6-4 6-2

Stefan Kozlov Colton Smith
1 Aces 1
2 Double Faults 2
- Service Points -
- First Serve In -
21 First Serve Won 16
12 Second Serve Won 11
0 Break Points Saved 1
1 Break Points Faced 5
- Winners -
- Unforced Errors -
3.2 Average Odds 1.3
L Hard Tiburon challenger · 1. round · 2026-09-16

vs Darwin Blanch #245

6-3 2-6 7-6

Stefan Kozlov Darwin Blanch
1 Aces 5
2 Double Faults 7
- Service Points -
- First Serve In -
39 First Serve Won 42
23 Second Serve Won 24
5 Break Points Saved 6
8 Break Points Faced 10
- Winners -
- Unforced Errors -
2.6 Average Odds 1.4
W Hard Brownsburg challenger · 1. round · 2026-08-13

vs Aidan Mayo #625

6-3 5-7 6-2

Stefan Kozlov Aidan Mayo
0 Aces 3
2 Double Faults 4
82 Service Points 81
58 First Serve In 51
42 First Serve Won 33
18 Second Serve Won 19
3 Break Points Saved 4
4 Break Points Faced 7
- Winners -
- Unforced Errors -
2.4 Average Odds 1.5
L Hard Brownsburg challenger · R16 · 2026-08-13

vs Harry Wendelken #201

2-6 6-4 6-1

Stefan Kozlov Harry Wendelken
- Aces -
- Double Faults -
- Service Points -
- First Serve In -
- First Serve Won -
- Second Serve Won -
- Break Points Saved -
- Break Points Faced -
- Winners -
- Unforced Errors -
1.9 Average Odds 1.8
L Hard Washington · qualification - 1. round · 2026-07-25

vs Zachary Svajda #73

7-5 6-1

Stefan Kozlov Zachary Svajda
3 Aces 5
2 Double Faults 3
64 Service Points 61
31 First Serve In 32
19 First Serve Won 24
10 Second Serve Won 16
5 Break Points Saved 4
10 Break Points Faced 6
- Winners -
- Unforced Errors -
4.8 Average Odds 1.2
L Hard Bloomfield Hills challenger · 1. round · 2026-07-21

vs Alan Magadan #650

3-6 6-1 7-6

Stefan Kozlov Alan Magadan
8 Aces 3
7 Double Faults 3
94 Service Points 101
56 First Serve In 63
35 First Serve Won 35
19 Second Serve Won 16
6 Break Points Saved 8
10 Break Points Faced 13
- Winners -
- Unforced Errors -
1.4 Average Odds 2.6
L Hard Bloomfield Hills challenger · qualification - round of 16 · 2026-07-20

vs Roger Pascual Ferra #808

6-4 6-4

Stefan Kozlov Roger Pascual Ferra
1 Aces 0
2 Double Faults 4
68 Service Points 63
53 First Serve In 45
37 First Serve Won 27
7 Second Serve Won 9
5 Break Points Saved 4
6 Break Points Faced 7
- Winners -
- Unforced Errors -
1.4 Average Odds 2.7
W Hard Bloomfield Hills challenger · qualification - 1. round · 2026-07-19

vs Leo Vithoontien #690

4-6 6-1 6-2

Stefan Kozlov Leo Vithoontien
1 Aces 2
1 Double Faults 1
79 Service Points 88
68 First Serve In 73
49 First Serve Won 42
5 Second Serve Won 6
3 Break Points Saved 7
4 Break Points Faced 11
- Winners -
- Unforced Errors -
1.1 Average Odds 6.6
L Hard Pozoblanco challenger · 1. round · 2026-07-14

vs Yi Zhou #236

6-3 3-6 6-4

Stefan Kozlov Yi Zhou
3 Aces 3
5 Double Faults 4
84 Service Points 112
54 First Serve In 64
33 First Serve Won 40
16 Second Serve Won 24
5 Break Points Saved 6
10 Break Points Faced 10
- Winners -
- Unforced Errors -
2.4 Average Odds 1.5
L Grass Newport challenger · R16 · 2026-07-10

vs Jacob Fearnley #159

3-6 6-3 6-2

Stefan Kozlov Jacob Fearnley
2 Aces 2
2 Double Faults 6
83 Service Points 77
46 First Serve In 49
27 First Serve Won 33
15 Second Serve Won 10
5 Break Points Saved 3
12 Break Points Faced 8
- Winners -
- Unforced Errors -
4.1 Average Odds 1.2