premise: Tobias Svantesson (born April 1, 1963, in Malmo, Sweden), is a former professional tennis player from Sweden. He enjoyed most of his tennis success while playing doubles. During his career he won 2 doubles titles. He achieved a career-high doubles ranking of World No. 65 in 1991. His career high world ranking in singles was no 89.
hypothesis: Tobias Svantesson has played other than doubles, despite them being where he had the most success.
reason: The text didn't say he ONLY played doubles.