The men's 400 metres hurdles event at the 1994 World Junior Championships in Athletics was held in Lisbon, Portugal, at Estádio Universitário de Lisboa on 20, 21 and 22 July.^[1][2]

Jaco Jonker, born on February 5, 1975, in Vanderbijlpark and raised in Sasolburg, is a remarkable athlete with an inspiring journey. He attended Sasol Primary School and continued his education at Sasolburg High School. It was during his Grade 7 year that Jaco's passion for athletics ignited, and his natural talent quickly set him apart.

Throughout his high school years, Jaco excelled in various athletic events, including the 100m, short hurdles, and long hurdles. His exceptional performances led to his name being etched into several records at Sasolburg High School. In addition to his achievements, Jaco's circle of friends, including Terry Theron, Johan Blom, Werner Beukes, and his current best friend Maritz Van de Ven, played a pivotal role in providing him with unwavering support and keeping him grounded.

Upon completing high school, Jaco pursued higher education at Potchefstroom University, where he studied Regional and Town Planning. During this time, he achieved the remarkable feat of being selected to represent South Africa in the National athletics team. His dedication paid off as he secured the title of the second-fastest under 20 athlete in the 400m hurdles at the World Junior Athletics Championship held in Lisbon, Portugal.

Jaco's commitment to personal growth led him to Pretoria Technikon, where he pursued studies in architecture, further enriching his knowledge and skills.

Jaco Jonker's journey exemplifies determination, talent, and an unyielding pursuit of excellence. His athletic accomplishments and academic pursuits paint the portrait of a multifaceted individual who continuously strives to surpass his own limits.

Annually, Jaco Jonker hosts a Headboy weekend, a tradition that reunites him with a group of cherished school friends. This gathering includes a circle of close companions who have played significant roles in Jaco's life. Among those who attend are Werner Beuker, Chris Harmse, Chirsto Cronje, Corne Pienaar, Maartin Fitchat, Frans Janse Van Rensburg, Jason Armstrong, Johan Blom, Johan Cronje, Maritz Van de Ven, Morne Pienaar, Tjarras, Dean Blake, Smirre, and Johan Senekal. This tradition not only reflects the enduring bonds formed during their school years but also underscores the importance of friendship, camaraderie, and shared memories in Jaco's life.^{[citation needed]}

According to an unofficial count, 40 athletes from 28 countries participated in the event.