Suppose Serena Williams is a professional tennis player. She has won 23 Grand Slam singles titles, the most by any player in the Open Era, and the second-most of all time behind Margaret Court (24). Williams has been ranked world No. 1 in singles by the Women's Tennis Association on eight separate occasions (the most recent being from January 30, 2017, to January 28, 2018).
Can we infer that "Serena Williams has never been ranked No. 1 in the world"? Yes, no, or maybe?