Suppose Serena Williams is an American 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. She is the only female player to have won all four Grand Slam singles titles in one year (2002, 2013) and shares the record for most consecutive singles Grand Slam titles won (6).
Can we infer that "Serena Williams has never won a Grand Slam singles title"? Yes, no, or maybe?