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 second-most of all time. Williams has also won 14 Grand Slam doubles titles, all with her sister Venus Williams.
Can we infer that "Serena Williams has never won a Grand Slam singles title."? Yes, no, or maybe?