Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sadiq Abdullahi (born February 2, 1960) is a former tennis player from Nigeria, who represented his native country at the 1988 Summer Olympics in Seoul, where he was defeated in the first round by Spain''s Javier Sanchez. The right-hander reached his highest singles ATP-ranking on October 14, 1985, when he became the number 262 of the world. Tennis is a sport usually played between two players (singles) or between two teams of two players each (doubles). Each player uses a racket that is strung to strike a hollow rubber ball covered with felt past a net into the opponent''s court.