PARIS -- Yes, tennis fans, Roger Federer is finally on Twitter.
The owner of a record 17 Grand Slam titles says Friday he waited to join the social media site until after seeing how other athletes used it.
Speaking at the French Open, which begins Sunday, Federer says: "At the end of the day, it's got to be something I needed to feel comfortable with."
He accrued more than 150,000 followers within the first 18 or so hours of tweeting for the first time from his verified account.
He's still got quite a ways to go to catch rivals Rafael Nadal -- who has more than 4 million followers -- and Novak Djokovic -- at about 1.8 million -- on Twitter.
Federer, though, can point to his lead in major championships.