Julian Simon led an Aspar Aprilia one-two during the first day of 2009 125cc testing at Jerez on Monday.

Simon lapped the Spanish Grand Prix circuit in a best time of 1min 48.875sec, almost half a second quicker than Smith, with Marc Marquez a fraction slower in third for KTM.

Sandro Cortese was almost two-seconds from Simon in fourth place for Derbi, with 2008 British Grand Prix winner Scott Redding a further 0.12sec back for Blusens Aprilia.

Jerez 125cc test - day one:

1. Julian Simon Aprilia 1min 48.875sec
2. Bradley Smith Aprilia 1min 49.313sec
3. Marc Marquez KTM 1min 50.300sec
4. Sandro Cortese Derbi 1min 50.710sec
5. Scott Redding Aprilia 1min 50.834sec
6. Sergio Gadea Aprilia 1min 51.115sec
7. Esteve Rabat Aprilia 1min 51.891sec
8. Dominique Aegerter Derbi 1min 52.204sec
9. Cameron Beaubier KTM 1min 52.598sec