Baltimore Sun reporter Jeff Zrebiec hands out his midseason grades for the 2010 Orioles. Grades are based on performance relative to each individual's role on the Orioles' roster. They are not intended to rate players in relation to one another or to other teams. Only players either on the Orioles' current 25-man roster or who started the season on the 25-man roster are graded. Inc. - incomplete. Zrebiec explains his grades.