Rivas will start at shortstop and bat ninth in Monday's game against the Giants.
Rivas will stick in the lineup for the sixth game in a row after after producing seven hits and drawing a walk over his last five starts. He seems to have displaced Dylan Moore as the Mariners' preferred option at shortstop at the moment, but Rivas' run of regular playing time will likely come to an end soon. J.P. Crawford (finger) kicked off a rehab assignment Saturday and should be ready to return from the injured list later this week to reclaim everyday duties at shortstop.