Barbera targets MotoGP top five

Hector Barbera enters the second half of his second MotoGP season believing he can beat his best finish of sixth, as he seeks to secure his Aspar Ducati ride for 2012.The Aspar outfit, which fields teams in all three grand prix classes, looks certain to remain in MotoGP next year - and may even expand to two bikes.Barbera has been the team's lone rider since its 2010 premier-class debut and is