 He was also the third-youngest Australian Open quarterfinalist in his first Grand Slam appearance, at 17 years 5 months in 1975, behind Boris Becker, 17 years 4 days in 1984 and Goran Ivanišević, 17 years 4 months in 1989.Drewett won two career singles titles, reached the quarterfinals of the 1976 Australian Open and attained a career-high singles ranking of world No.34 in March 1984.