Kaestner idolized
Peter Aerts and began training in kickboxing at the age of 10. After five years of fighting at smaller Dutch events, Leroy Kaestner made his K-1 debut at the
K-1 World MAX 2009 Europe Tournament in
Utrecht, Netherlands on March 1, 2009, becoming the surprise winner of the competition, beating
Marco Pique in the final by
unanimous decision. As a result of his victory Kaestner would qualify for the
K-1 World MAX 2009 Final 16, losing by decision to eventual runner up
Andy Souwer. Kaestner's performance against Souwer would lead to him being invited to the
K-1 World MAX 2009 Final 8 as a reservist, although he would lose his bout to local fighter
Yasuhiro Kido. Since that tournament Leroy has continued his progress claiming a notable win over K-1 MAX finalist
Gago Drago at
It's Showtime 2010 Amsterdam. Despite this recent run of good form Kaestner was not re-invited back to the K-1 Max final in 2010. At the end of 2010, Kaestner won his second major title by defeating Cagri Ermis to win the W.F.C.A. European title -72.5
kg. == Titles ==