have Bob Bryan and Samantha Stosur both been world No. 1 in doubles?
Bob Bryan:  With his twin brother Mike, he has been world No. 1 doubles player for much of the last several years, first achieving the top ranking in September 2003. Samantha Stosur:  She is a former world No. 1 in doubles, a ranking which she held for 61 weeks, and a former world No. 4 in singles.
i don't know