Boxing already has many stars, so here are some guys that are the cusp on stardom. I won't name guys like Canelo, Wilder or Thurman because I feel like they're already stars in a recovering sport.
Anthony Joshua- Heavyweight (UK)
Dmitry Kudryashov- Cruiserweight (Rus)
Artur Beterbiev- Light Heavyweight (Rus)
Callum Smith- Super Middleweight (UK)
Chris Eubank Jr.- Middleweight (UK)
Julian Williams and Erickson Lubin- Super Welterweight (USA)
Sammy Vasquez and Errol Spence Jr.- Welterweight (USA)
Amir Imam- Super Lightweight (USA)
Felix Verdejo (PR), Luke Campbell (UK), and Robert Easter Jr. (USA)- Lightweight
Adrian Estrella, Francisco Vargas (Mex), and Jose Pedraza (PR)- Super Featherweight
Vasyl Lomanchenko (UKR)- Featherweight
Albert Pagara (PHI) and Rey Vargas (MEX)- Super Bantamweight
Shohei Omori, Ryo Matsumoto (JPN), and Randy Caballero (USA)- Bantamweight
Naoya Inoue (JPN) and McJoe Arroyo (PR)- Super Flyweight
Amnat Ruenrong (THA) and McWilliams Arroyo (PR)- Flyweight
Ali Raymi aka GOD (YEM) and Francisco Rodriguez Jr.- Light Flyweight
Kosei Tanaka (JPN)- Minimumweight