Suppose Serena Williams is an American professional tennis player. The Women's Tennis Association ranked her world No. 1 in singles on eight separate occasions between 2002 and 2017. She reached the No. 1 ranking for the first time on July 8, 2002, and achieved her sixth No. 1 ranking on February 18, 2013. On her sixth occasion, she held the ranking for 186 consecutive weeks, tying the record set by Steffi Graf for the most consecutive weeks as No. 1 by a female tennis player.
Can we infer that "Serena Williams has never been ranked world No. 1 in singles."? Yes, no, or maybe?