Uncle Toni says four men pose biggest threat to Rafa in Paris.
The Serb things players should take part in the discussion about when to water the courts at Roland Garros.
The German is getting ready for another five-setter ahead of his first ever major quarterfinal.
Day 9 of Roland Garros features Simona Halep, Rafael Nadal and Serena Williams on Chatrier
World No. 72 is lowest-ranked men's quarterfinalist in Paris since Ernests Gulbis in 2008.
"I think the book was 100 percent hearsay," Williams said of Sharapova's memoir.
Round of 16 action begins on Sunday in Paris, with Novak Djokovic, Dominic Thiem, Madison Keys and Sloane Stephens headlning Chatrier.
