Pete Sampras is considered the greatest American men's tennis player of all time, holding the record of 14 Grand Slam titles and being ranked number one for six consecutive years. Andre Agassi dethroned Sampras from the number one ranking in 1999 and won eight Grand Slams, also contributing to the popularity of tennis during a career downturn when he admitted to abusing drugs. Jimmy Connors was the top ranked player from 1974-1977, winning eight Grand Slams and 109 ATP singles titles.