SARASOTA, Fla. - Jake Arrieta makes his final spring start today against a Pirates split squad in the Orioles' final road game. Seems like a good time for manager Buck Showalter to confirm that Arrieta will be the opening day starter. For the Orioles: Endy Chavez CF Nolan Reimold LF J.J. Hardy SS Nick Johnson DH Wilson Betemit 3B Chris Davis 1B Ronny Paulino C Jai Miller RF Robert Andino 2B Jake Arrieta RHP Jim Johnson will pitch again today. He threw 24 pitches yesterday but still will make back-to-back appearances. Also, Chris Tillman and Tommy Hunter will each throw five innings Sunday in a simulated game at Twin Lakes Park. Tillman still doesn't know whether the Orioles view him only as a starter or whether he could make the club in long relief.