Reilly Opelka vs Stefan Kozlov Head-to-Head Stats, Results & Performance Comparison

Wojtek Kolan

Our Predictions

H2H Records Career Stats

HEAD TO HEAD
R. Opelka vs S. Kozlov

Reilly Opelka

USA

1

Win

Played

0

Win

Age

6'11" (211 cm)

Height

6'0" (183 cm)

C. Rank

451

Best Rank

103

Total Titles

Ytd Titles

$3.8M

Career Money

$372.0K

Right-Handed

Plays

Right-Handed

Stefan Kozlov

USA

1

Win

Played

0

Win

Age

6'11" (211 cm)

Height

6'0" (183 cm)

C. Rank

451

Best Rank

103

Total Titles

Ytd Titles

$3.8M

Career Money

$372.0K

Right-Handed

Plays

Right-Handed

Head-To-Head: Opelka 1 - 0 Kozlov

They have played 2 sets in total, with Reilly Opelka winning 2 and Stefan Kozlov winning 0. The last match between Reilly Opelka and Stefan Kozlov was at the Bordeaux Challenger, 18-05-2018, Round: QF, Surface: Clay, with Reilly Opelka getting the victory 7-6(4) 6-1.

Players	Head To Head Match Wins
Opelka	1
Kozlov	0

Last H2H Matches:

(QF) Bordeaux Challenger(05-18-18)

Stats

Reilly Opelka

Stefan Kozlov

R. Opelka vs S. Kozlov H2H Profile

R. Opelka	Stats	S. Kozlov
$3,786,810	Career Prize Money	$371,951
56.10% (253-198)	Career Total W/L	56.71% (338-258)
1	Clay	0
8	Titles	10
1	Total H2H Matches	0
54.76% (23-19)	YTD Win/Loss	0% (0-0)

R. Opelka vs S. Kozlov Match Preview

Second serve performance recent form: In recent form (last 6 months), Reilly Opelka has won 48.40% of points on their second serve, while Stefan Kozlov has won 43.54%. There is a high correlation between this stat and match prediction accuracy.
Return game stats recent form: Return stats show Reilly Opelka, in recent form, has won 39.48% of their opponent's second serve points, while Stefan Kozlov has won 49.91%. The same stats for first serve returns are 17.61% and 30.95% respectively and this has a high correlation to pick who is favored in this H2H matchup.
Under pressure analysis: Reilly Opelka has saved 66.19% of breakpoints in recent form, whereas Stefan Kozlov has saved 48.68% which is a useful statistic for in-game betting predictions.
Performance overview: Over the last year Reilly Opelka has won 52.73% of matches played (W/L 29/ 26), with Stefan Kozlov winning 65.63% (W/L 29/ 11) that gives us an overall head-to head prediction overview.
Best surface: Reilly Opelka has their best career surface win % on I.hard, winning 66% (W/L 46/ 24), and worse career win % on Grass, winning 46% (W/L 17/ 20). Stefan Kozlov has their best career surface win % on I.hard, winning 63% (W/L 80/ 47), and worse career win % on Grass, winning 38% (W/L 15/ 24).
Player level: In the last year, Reilly Opelka has played most of their matches on the Main tour, winning 57.69% of matches (W/L 15/ 11), where as Stefan Kozlov has played most of their matches on the Challengers/ITF tournaments > $10K, winning 62.50% of matches (W/L 15/ 9). When comparing stats between players to predict the favorite, it is of course all relative to the event level they have been playing at.
Direct H2H matches: They have played 1 times before with Reilly Opelka winning 1 times and Stefan Kozlov being victorious 0 times. They have played 2 sets in total, with Reilly Opelka winning 2 and Stefan Kozlov winning 0. The last match between Reilly Opelka and Stefan Kozlov was at the Bordeaux Challenger, 18-05-2018, Round: QF, Surface: Clay, with Reilly Opelka getting the victory 7-6(4) 6-1.
Head to head match duration: In past head to head matches, the average match time between these players has been 1:25:26.
Opponent quality stats: Over the last 12 months, Reilly Opelka has played against opponents with an average rank of 89.84 while Stefan Kozlov has played against players with an average rank of 403.
Deciding set performance vs all players: If you are interested in live predictions and betting, if this match goes into a deciding set, Reilly Opelka has won 56% of deciding sets over the last 12 months, while Stefan Kozlov has won 64% in all matches played on tour.
Break point conversion: In recent form, Reilly Opelka has converted 19.66% of breakpoint opportunities, and Stefan Kozlov has converted 38.03% of their chances to break their opponents serve. A telling stat for in-game live betting tips when either player has a breakpoint opportunity.

Reilly Opelka vs Stefan Kozlov Editorial Preview By TennisTipster88.

R. Opelka vs S. Kozlov H2H Stats Used In Our Predictions

R. Opelka	Stats	S. Kozlov
1	H2H Matches Won	0
2	Sets Won	0
13	Games Won	7
6	Aces (Total)	2
1	Total Double Faults	2
1:25:26	Avg. Match Time	1:25:26
66% (37/56)	1st Serve %	68% (50/73)
62% (23/37)	1st Serve Win %	52% (26/50)
58% (11/19)	2nd Serve Win %	30% (7/23)
67% (6/9)	Break Pts Won %	60% (3/5)
55% (40/73)	Return Pts Won %	39% (22/56)
100% (1/1)	Best‑of‑3 Win %	0% (0/1)
100% (1/1)	1st Set Won → Match Won	0% (0/0)
0% (0/1)	1st Set Won → Match Lost	0% (0/0)
0% (0/0)	1st Set Lost → Match Won	0% (0/1)

Recent Performance Stats

R. Opelka Recent Matches Played

OPPONENT	RESULT	SCORE	H2H
Laver Cup - San Francisco - 15-09-2025
Robin Casper RuudC. Ruud	L	6-4 7-6(4)	Stats
U.S. Open - New York - 25-08-2025
R1 Carlos AlcarazC. Alcaraz	L	6-4 7-5 6-4	Stats
Cincinnati Open - Cincinnati - 04-08-2025
R3 Francisco ComesanaF. Comesana	L	6-7(4) 6-4 7-5	Stats
R2 Alex De MinaurA. De	W	7-6(6) 6-4	Stats
R1 Hugo DellienH. Dellien	W	7-5 7-6(3)	Stats

View All

S. Kozlov Recent Matches Played

OPPONENT	RESULT	SCORE	H2H
Chicago Challenger - 04-08-2025
Q3 Tsung-Hao HuangT. Huang	L	1-6 7-5 6-2	Stats
Q1 Ramkumar RamanathanR. Ramanathan	W	6-1 6-7(4) 5-3 ret.	Stats
Newport Challenger - 07-07-2025
R1 Mitchell KruegerM. Krueger	L	6-1 3-6 6-1	Stats
Tyler Challenger - 02-06-2025
Q3 Alvin Nicholas TudoricaA. Nicholas	L	7-5 6-3	Stats
Q1 Daniel MilavskyD. Milavsky	W	6-3 6-7(7) 6-3	Stats

View All

R. Opelka vs S. Kozlov Stats Breakdown Vs All H2H Opponents

R. Opelka	Stats	S. Kozlov
56.10% (253/198)	YTD Win/Loss	56.71% (338/258)
54.68% (607/503)	Sets Win/Loss	53.99% (758/646)
50.89% (5934/5727)	Games Win/Loss	51.48% (6727/6339)
53.95% (116/99)	Hard Win/Loss	55.33% (166/134)
57.36% (74/55)	Clay Win/Loss	59.23% (77/53)
65.71% (46/24)	Indoor Hard W/L	62.99% (80/47)
45.95% (17/20)	Grass Win/Loss	38.46% (15/24)
1.12	Aces Per Game	0.22
6395	Aces Total	1430
0.22	Double Faults Per Game	0.33
1266	Total Double Faults	2102
1:27:28	Average Match Time	1:35:5
388.64	Average Opponent Rank	559.63
62% (19188/30815)	1st Serve %	61% (22789/37267)
79% (15184/19188)	1st Serve Win %	66% (15079/22789)
54% (6310/11627)	2nd Serve Win %	48% (6985/14478)
32% (533/1656)	Break Points Won % (Total)	42% (1766/4187)
29% (8740/29687)	Return Points Win %	42% (15694/37759)
47.27% (26/29)	Slam W/L	31.03% (9/20)
54.29% (38/32)	Masters W/L	23.53% (4/13)
50.00% (4/4)	Cups W/L	0% (0/0)
52.45% (75/68)	Main Tour W/L	38.81% (26/41)
64.00% (64/36)	Challenger W/L	58.06% (198/143)
61.33% (46/29)	Futures W/L	71.13% (101/41)
58% (235/406)	Best of 3 Sets Win %	57% (330/578)
44% (17/39)	Best of 5 Sets Win %	45% (5/11)
54% (192/355)	Tiebreaks Win % (Total)	48% (68/143)
54% (86/158)	Deciding Set Win %	61% (127/207)
83% (236/195)	1st Set Won, Won Match	87% (310/270)
17% (236/41)	1st Set Won, Lost Match	12% (310/38)
27% (215/58)	1st Set Lost, Won Match	24% (286/68)