The athlete known for the fastest recorded serve in tennis is Sam Groth, who achieved a remarkable speed of 263.4 km/h (163.7 mph) during a 2012 challenger event in Busan, South Korea. This incredible serve, a testament to Groth’s power and technique, remains a record in professional tennis. Fast serves can significantly alter the dynamics of a match, providing a strategic advantage over opponents and showcasing the best of athletic skill.