Suppose Serena Williams is an American professional tennis player. She has won 23 Grand Slam singles titles, more than any other player in the Open Era. Williams has been ranked world No. 1 by the Women's Tennis Association on eight separate occasions. She was born on September 26, 1981, in Saginaw, Michigan, USA.
Can we infer that "Williams has never won a Grand Slam singles title"? Yes, no, or maybe?