Suppose Serena Williams (born September 26, 1981) is a professional tennis player and former world No. 1 in women's singles tennis. She has won 23 Grand Slam singles titles, the most by any player in the Open Era, and the second-most of all time behind Margaret Court (24). Williams has also won 14 Grand Slam doubles titles with her sister Venus Williams.
Can we infer that "Serena Williams has never won a Grand Slam singles title."? Yes, no, or maybe?