CHICAGO - At the beginning of the Arlington Park meet, back in May, Best of Buddies tried - and failed - three times to win an entry-level Illinois-bred allowance race. His rapid progression from that point in time to Saturday, when he upset the Hawthorne Derby, can be traced chiefly to one factor - grass. Best of Buddies has decent form on dirt, but on turf he has yet to lose, his four-race winning skein capped off by a narrow victory in Saturday's Grade 3, $250,000 race.