Gerhard Erasmus was born in Windhoek in 1995 into a family deeply rooted in cricket. His father was a former administrator of Cricket Namibia, and the young boy grew up surrounded by the sport. He broke into the senior national setup at just fifteen years old in 2011, making him one of the youngest players in the history of the country to compete at that level. His natural composure and sharp cricketing instincts stood out immediately among domestic peers.

His transition through the age-group ranks was smooth and full of promise. He represented Namibia at the youth level and captained the side at the 2014 Under-19 World Cup in the United Arab Emirates. As a reliable right-handed batter and a smart off-break bowler, he soon became an indispensable presence in the senior setup. He balanced his sports career with law studies, which helped him build a disciplined approach to the game.

In 2019, Erasmus was appointed national captain, marking a golden era for Namibian cricket. Under his astute leadership, Namibia finished in the top four of the 2019 ICC World Cricket League Division Two tournament to earn official ODI status. He made his ODI debut in the final of that tournament against Oman and quickly made his T20 debut as well. He ended 2019 as the top run-scorer for Namibia in the global T20 qualifiers, guiding the nation to its first global tournament in nearly two decades.

The following years brought global recognition. Erasmus led Namibia to historic victories at the 2021 T20 World Cup, taking them into the Super 12 stage. He followed that with another famous triumph against Sri Lanka in the 2022 T20 World Cup. His prolific run in 2022, which included centuries in both ODI and T20 cricket, earned him the ICC Men's Associate Cricketer of the Year award in early 2023.

His consistency at the highest level opened doors across various franchise tournaments. He represented teams such as the Gulf Giants and later Kathmandu Gorkhas across 2024 and 2025. On the international front, Erasmus led Namibia in the 2024 T20 World Cup in the Caribbean and the United States, continuously anchoring the middle order and delivering crucial breakthroughs with the ball.

Into 2025 and 2026, Erasmus has continued to serve as the heart of Namibian cricket. He led the national team during the 2026 T20 World Cup campaign and drove their ongoing push in the 2024 to 2026 Cricket World Cup League 2 ODI cycle. In August 2026, he captained Namibia in a landmark home T20 tri-series in Windhoek against South Africa and Zimbabwe, reinforcing his legacy as the most influential figure in modern Namibian sport.