Suppose Serena Williams 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. The Women's Tennis Association (WTA) ranked her world No. 1 in singles on eight separate occasions between 2002 and 2017. Williams holds the most Grand Slam titles in singles, doubles, and mixed doubles combined among active players.
Can we infer that "Serena Williams has never won a Grand Slam singles title."? Yes, no, or maybe?