Love All by Maelle Brant

Charlotte Astor has never lost anything she wanted. Not a match, not an argument, not a fundraiser — being an Astor is a key that opens every door, and she’s spent twenty-one years pretending not to notice.
Then Benedict Prescott-Hawthorne, the most effortlessly adored man on campus, bets he can out-raise her for charity without touching his family’s name or money. Worse, their coach pairs the two number-one players into one mixed-doubles team, in front of paying strangers, for two weeks.
He’s all charm and no effort. She’s all effort and no mercy. Both were handed everything, and neither of them knows if they can earn a single thing that’s actually theirs.

It’s supposed to be war. Nobody warned her that the boy who never tries might be the only person who sees exactly who she is under the name.