While discussing the toughest shots he’s faced in tennis, Milos Raonic says Roger Federer’s combination of his backhand slice and forehand, and the way he uses them together, has put him over the top.

“[The slice] looks like easy to return, but he hits it cross short enough so it’s not a drop shot you can comfortably come in on, but short enough to bring you in,” Raonic said. “He keeps it low, so if you go down the line your margin of error is [high], and if you go cross he’s waiting with the rest of the court open. Even if you go at him you are backpedalling. I’ve sort of fared pretty well against it, but it’s what has gotten Roger through a lot of Grand Slams.”