Suppose Serena Williams (born September 26, 1981) is an American professional tennis player. She has held the No. 1 spot in the Women's Tennis Association (WTA) rankings multiple times over her career. Williams has won 23 Grand Slam singles titles, the most by any player in the Open Era, and is one of the greatest tennis players of all time.
Can we infer that "Serena Williams has never won a Grand Slam singles title."? Yes, no, or maybe?