Rafael Nadal will have to be more accurate with his strokes than his memory.

The eighth-seeded Nadal said he didn’t decline to play “doubles’’ with tennis bad boy Nick Kyrgios at John McEnroe’s kids charity event Wednesday at Randall’s Island and was never “asked.’’ The Post reported Nadal, fed up with Kyrgios’ recent behavior, refused to play with the Aussie. Nadal, however, may be clinging to semantics.

The Post — and other outlets — was emailed a media advisory Aug. 20 from McEnroe’s academy’s publicists promoting the event featuring a singles bout between Nadal and Kyrgios and a doubles battle featuring the McEnroe brothers.

Sources told The Post organizers rearranged the event because of Nadal’s reluctance to play Kyrgios in singles or doubles. Nadal faced Lleyton Hewitt in singles while Kyrgios was switched to the doubles event with the McEnroe brothers and late add Jonas Bjorkman.

A new advisory was sent out days later with Nadal-Hewitt.

“I was never supposed to play a doubles match,’’ Nadal said. “First, I was only supposed to play singles in the exhibition. That was wrong information. Second, I never knew I had to play against Kyrgios. I was told I was going to play Lleyton.’’

Nadal, who missed last year’s U.S. Open with a wrist injury and will open Monday night against Borna Coric, has been spotty this year and is not considered a serious contender. He was embarrassed in the second round of Wimbledon by qualifier Dustin Brown.

“We’ll see who the favorite is in a couple of weeks,’’ Nadal said. “That’s the real thing.”

Kyrgios will have to face No. 3 Andy Murray in the first round after getting a hard-luck draw. Kyrgios received sanctions for on-court taunting of Stan Wawrinka in Montreal, saying his girlfriend was getting “banged’’ by an Aussie compatriot.

“He’s a young guy and we all make mistakes,’’ Murray said. “I don’t think he’s a bad guy. … I think he likes playing on the big stages.’’

Maria Sharapova hasn’t played a regular match since Wimbledon, pulling out of the Open tune-ups because of assorted leg injuries and didn’t seem too excited about her chances of even reaching the semifinals and potentially facing Serena Williams.

“You have to be realistic and limit your expectations, but it’s never quite easy, because you’re a competitor,’’ she said.

The USTA released its schedule for Monday with the Open’s first match at Ashe Stadium between Ana Ivanovic and Dominika Cibulkova.

Venus Williams and Novak Djokovic also will be on the day card. This is the first year the entire first round is scheduled to be finished by Tuesday.