Former KTM star Marc Marquez is making his Derbi debut with the Ajo Motorsports team during a three-day test at Jerez in Spain (pictured), which began on Thursday.
The 16-year-old will ride factory RSA machines for the 2008 (Mike di Meglio) title-winning team next season.
"We are all extremely happy to get this chance to work with Marc, who is one of the most talented and promising riders in the series at the moment,” said Aki Ajo, team owner of Ajo Motorsport,
“I think many teams would jump at a chance like this, but we also recognise the work we must do to provide Marc with the best possible chances of fighting for the title next season.
“This three day test is the first one for us together, so we should be on a good run towards the 2010 championship fight."
Marquez took two poles and two podiums during just under two seasons of 125cc racing with KTM, and finished eighth overall in the 2009 standings.