Croatia • Netherlands

OskarMestric

An 8-year-old tennis player from Croatia, living and training in the Netherlands. He is part of the KNLTB National Selection team, trains hard every day and loves the challenge of always improving his game.

#1U9 Ranking NL
15Tournament Titles
87%Win Rate This Year
2026U10 National Finalist
Oskar Mestric striking an aggressive forehand on a clay court

About Oskar

Oskar loves tennis. He looks up to Jannik Sinner and tries to bring the same focus and work ethic to every practice. His game is aggressive, he is quick around the court, and he wants to be the best mentally strong player he can be.

He is part of the KNLTB Dutch National Selection 2026/2027 and trains with JS Tennis & Coaching team.

For the 2026-2027 season, Oskar's goals are to further strengthen his shots, improve his technique, speed and agility and be the best version of himself on court. He wants to stay on top of his age in Netherlands and start competing internationally.

  • Aggressive baseline play
  • Quick movement and footwork
  • Head Boom player
  • Speaks: Croatian, English, Dutch, French
Oskar hitting a two-handed backhand with his Head Boom racketOskar practising his serve on the clay court

Watch Oskar

Video • DartFish

Results

RANKING
#1

Netherlands U9 Overall

TITLES
15

Tournament Titles Won

BEST RESULTS
Finalist

2026 U10 Nationals (as 8yo)  2025 U9 Nationals (as 7yo)

PLAY STYLE
Fast

Aggressive Baseline Agility  Loves coming to the net

News

SEPTEMBER 2026

First international tournament: Limburg Cup

In September 2026 Oskar played his first international tournament, the U10 Limburg Cup team event. He represented Team Netherlands together with two other boys and three girls.

Playing for his country against international opponents was a great new experience and an important step in his development. Two of his matches were recorded.

Where I train every day...

Tennis School

JS Tennis & Coaching logo
WHERE OSKAR TRAINS
TC Park Marlot
Waalsdorperlaan 4B, 2244 BL Wassenaar
HLTC Thor de Bataaf
Ver-Huëllweg 2, 2585 JC, Den Haag

Oskar trains at JS Tennis & Coaching, a tennis school in Wassenaar.

  • Founded in 2016 by Jade Reijndorp (née Schoelink) and Lennart Reijndorp
  • High-quality technical training with personal attention
  • Coaches with professional tennis backgrounds
  • Training for youth and adults
PRIVATE TRAINER

Jade Reijndorp

née Schoelink

Oskar's private trainer. Jade was always at the top of Dutch junior tennis and reached the final of the Dutch Championships under 16. She played professionally from 2008 until 2014, rising to world No. 755 and Dutch No. 18. She has been coaching since 2011 and in 2023 completed the highest KNLTB coaching qualification, the C-license.

National Selection · Since September 2026

KNLTB National Training Centre

Since September 2026, Oskar trains weekly at the National Training Centre (NTC) in Amstelveen under the supervision of the KNLTB, as part of the National Selection team. His trainers there are Ronald de Wind and Jade Reijndorp.

KNLTB logo

Training in Amstelveen

The NTC brings national-level training and club tennis together in one place. It has been home to the KNLTB office since August 2019.

Oskar's training
Weekly · National Selection
Trainers
Ronald de Wind & Jade Reijndorp
Outdoor courts
14 · Hardcourt and clay
Indoor courts
14 · Hardcourt and carpet
NTC on knltb.nl
Aerial view of the National Training Centre and its outdoor tennis courts in Amstelveen
National Training Centre, Amstelveen · Photo: KNLTB
Where I train when in Croatia...

Ljubicic Tennis Academy

Since he was 6 years old, Oskar also visits the Ljubicic Tennis Academy on the island of Lošinj in Croatia, his home country, several times a year. It is a collaboration he is very happy with.

Ljubicic Tennis Academy logo
WHERE OSKAR TRAINS IN CROATIA
Ljubicic Tennis Academy
Šestavina 17, Veli Lošinj
Island of Lošinj, Croatia

The Ljubicic Tennis Academy is a boutique academy founded by Ivan Ljubicic, former world No. 3. Set among pine trees next to the clear Adriatic Sea, it brings together world-class coaches and tennis lovers of all ages.

  • Founded by Ivan Ljubicic, former world No. 3
  • Training method developed by Ivan Ljubicic himself
  • Academy Pro program for competitive players aged 10 to 18
  • Summer and year-round camps for all ages and levels
Oskar hitting a forehand at Ljubicic Tennis Academy, Lošinj
Oskar jumping into a forehand on clay in Lošinj
Oskar rallying on a clay court in Lošinj
Oskar preparing a forehand at Ljubicic Tennis Academy
Oskar hitting a backhand on clay in Lošinj
Oskar playing a forehand at Ljubicic Tennis Academy

Media

Videos and posts about Oskar from social media. New clips are added here as they are published.