(AGI) Misano Adriatico, Sept 13 - Valentino Rossi was fastestin the fourth and last free practice session for the San Marinoand Rimini Riviera Grand Prix. Sunday's race on the 4.225kilometre Misano circuit will be the 13th of the 18-leg WorldMotoGP Championships. Rossi (Yamaha) finished in 1m34.079s,just 0.022s ahead of Spanish teammate Jorge Lorenzo. FellowSpaniards Marc Marquez and Daniel Pedrosa (Repsol Honda) camethird and fourth at 0.147s and 0.411s slower respectively.Andrea Dovizioso (Ducati) finished fifth 0.541s behind Rossi,and Andrea Iannone (Pramac) finished 0.541s behind. .