Bradley Smith is set to start the 125cc season as title favourite, although he will face a tough challenge from his new Aspar team-mate Nicolas Terol.
British teenager Smith finished second in the standings to team-mate Julian Simon last year and took two race wins. Terol joins him at Aspar for 2010, having finished third in the standings with the Jack&Jones team last season.
Other leading returnees in the entry list issued by the FIM today include double race winner Pol Espargaro, regular frontrunner Sandro Cortese, and rising 16-year-olds Marc Marquez and Jonas Folger.
Simone Corsi, who was runner-up to Mike di Meglio in the 2008 125cc title race but slumped to 11th last year, also stays on for a seventh season in 125cc.
2010 125cc entry list No. Rider Team Bike 5 Alexis Masbou WorldwideRace Team Aprilia 7 Efren Vazquez Bainet Derbi Derbi 9 Muhammad Zulfahmi Empowerment WorldwideRace Team Aprilia 11 Sandro Cortese Red Bull Ajo Motorsport Derbi 12 Esteve Rabat BQR Racing Aprilia 14 Johann Zarco WTR San Marino Team Aprilia 18 Nicolas Terol Bancaja Aspar Team Aprilia 23 Alberto Moncayo Andalucia Cajasol Aprilia 24 Simone Corsi Fontana Racing Aprilia 26 Adrian Martin Team WRB Aprilia 32 Lorenzo Savadori Matteoni C.P. Racing Aprilia 35 Randy Krummenacher Molenaar Racing Aprilia 38 Bradley Smith Bancaja Aspar Team Aprilia 39 Luis Salom Lambretta Reparto Corse Lambretta 44 Pol Espargaro Bainet Derbi Derbi 50 Sturla Fagerhaug Empowerment WorldwideRace Team Aprilia 69 Louis Rossi CBC Corse Aprilia 71 Tomoyoshi Koyama Racing Team Germany Honda 72 Marco Ravaioli Lambretta Reparto Corse Lambretta 78 Marcel Schrotter Interwetten Racing Honda 80 Quentin Jacquet Molenaar Racing Aprilia 84 Jakub Kornfeil Racing Team Germany Honda 87 Luca Marconi WorldwideRace Team Aprilia 93 Marc Marquez Red Bull Ajo Motorsport Derbi 94 Jonas Folger WorldwideRace Team Aprilia 99 Danny Webb Team WRB Aprilia tba tba CBC Corse Aprilia