Suppose Serena Williams (born September 26, 1981) is an American professional tennis player and former world No. 1. She has won 23 Grand Slam singles titles, the most by any player in the Open Era, and has been ranked world No. 1 in singles by the Women's Tennis Association (WTA) eight times.
Can we infer that "Serena Williams has never won a Grand Slam singles title."? Yes, no, or maybe?