Question: Which of the following won 19 Grand Slam single titles as a professional tennis player: Roger Federer or Jonathan Stark?
Sentence (from "Roger Federer"): Federer has won 19 Grand Slam singles titles, the most in history for a male tennis player and has held the world No. 1 spot in the ATP rankings for a record total of 302 weeks, including a record 237 consecutive weeks.
Relevant evidence: Yes