Mario Tennis Fever addresses every nagging issue from the last time Mario stepped onto the court. There’s a lot riding on Mario Tennis Fever. Despite arguably being Mario’s best sports spinoff, the last game in the series, 2018’s Mario Tennis Aces, left a lot to be desired. Mario Tennis Fever will feature a single-player Adventure Mode, a big step up from Aces’ exceptionally short story mode. NintendoMario Tennis Fever appears to be taking all the correct steps to right the wrongs of Mario Tennis Aces.