Suppose Serena Williams is a 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 the only player ever to have won Grand Slams in singles, doubles, and mixed doubles. She is widely regarded as one of the greatest tennis players in history.
Can we infer that "Serena Williams has never won a Grand Slam singles title."? Yes, no, or maybe?