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 the second most of all time behind Margaret Court. Serena has also won four Olympic gold medals in singles and doubles, and holds the record for most prize money won by a female athlete.
Can we infer that "Serena Williams has never won a Grand Slam singles title"? Yes, no, or maybe?