In 1954, Magill became Head Coach of the struggling Bulldog Tennis program. He held the title for the next 34 years, building the program with a 706–183 record (most wins by any coach in NCAA history), 13 Southeastern Conference outdoor championships, 8 SEC indoor championships, and 2 national championships. In addition, he built UGA's tennis complex and brought the ITA Collegiate Tennis Hall of Fame to Athens, which was named in his honor. He persuaded Kenny Rogers and Marianne Rogers to donate the funds for the Hall of Fame building. He was inducted into the Georgia Sports Hall of Fame in 1976.