Rivera will start at third base and bat seventh in Wednesday's game against the Giants.
Rivera has produced a .754 OPS thus far in September and will be rewarded with a sixth consecutive start at third base while he remains one of the Orioles' more productive bats of late. Though top prospect Coby Mayo hasn't presented much of a threat to his playing time, Rivera could be more at risk of losing at-bats once Ramon Urias (ankle) returns from the injured list. Urias is expected to report to Triple-A Norfolk on Thursday to begin a rehab assignment.