Lawrence was optioned to Triple-A Tacoma on Tuesday.
Lawrence is unavailable for a couple days after pitching four innings of relief Monday, so the Mariners decided to swap him out for a fresh bullpen arm (Sam Gaviglio). He'll head back to Tacoma for the time being, where he owns a 4.08 ERA in 57.1 innings this season, but he should be back with the big club later in August or when rosters expand.