This will be the sixth time that Mannarino, a left-hander, has faced Federer. He has lost the previous five but impressed in their most -recent meeting, in Basel last year, when he won the opening set.
"It is stupid to think you are beaten before you go out on court, if you think there is no point in -going out there," Mannarino said.
Mannarino's game is well suited to grass and this is the third time he has reached the fourth round here. He would also have been grateful for the extra day's rest after a marathon five-set victory over Russia's Daniil Medvedev which took more than three hours to complete. He has never progressed beyond the third round of any other grand slam tournament.
"I work very hard every day to be a better player and I now think I can beat these kind of players," Mannarino said. "I am definitely not thinking already I will lose. I believe I can win the match."
Despite being the plucky underdog on paper, he knows that, as ever, it will be Federer who receives the crowd's backing on Centre Court.
"I have played Federer in the US Open, in his home town of Basel and here before," the 30-year-old said. "He is popular everywhere. So it does not matter where you play him, I will not be the one the crowd is cheering for so I am not too worried about that.
"I just have to concentrate on what I have to do and see what happens. The last match in Basel was a good match and pretty close."