Suppose Serena Williams (born September 26, 1981) is an American professional tennis player. She has been ranked world No. 1 in singles by the Women's Tennis Association (WTA) on eight separate occasions between 2002 and 2017. She reached the No. 1 ranking for the first time on July 8, 2002.
Can we infer that "Serena Williams has never been ranked as world No. 1 in tennis."? Yes, no, or maybe?