Martinez is scheduled to start Sunday's game against the Mets, AJ Cassavell of MLB.com reports.
The right-hander worked in long relief last weekend but will make a spot start Sunday since San Diego has a doubleheader scheduled for Saturday. Martinez threw 70 pitches over four innings during that relief outing and threw 93 pitches in his last start May 30, so he shouldn't face any notable workload restrictions as a spot starter.