Rory McIlroy was not in the mood to discuss his personal life while facing a pool of reporters at the PGA Championship on Wednesday ... sticking to sports as he fielded questions.
TMZ Sports broke the story -- the 35-year-old golf superstar filed for divorce from his wife, Erica Stoll, earlier this week ... but anyone hoping to get some more info about Rory's off-course affairs was left without a soundbite.
Journalists were instructed to NOT ask anything about McIlroy's personal matters as he took the stage at Valhalla .