Question: Who has won the most tennis major titles?
Disambiguated questions and answers: question: Who has won the most men's singles tennis major titles?
Who has won the most women's singles tennis major titles?
Who has won the most men's doubles tennis major titles?
Who has won the most women's doubles tennis major titles?
Who has won the mixed men's doubles tennis major titles?
answer: Federer
Roger Federer
Court
Margaret Court
Bryan
Mike Bryan
Martina Navratilova
Navratilova
Court
Margaret Court
Natural Questions answer: Roger Federer (from the Wikipedia article "List of Grand Slam men's singles champions")