Listen Live
Mariners manager Dan Wilson said Robles has a shoulder-related injury and was having tests done at Oracle Park.
Several school districts within Whatcom County were among the proponents of the rule changes.
Both teams play Saturday. The Kraken are at San Jose. The Canucks will host Anaheim.
Mariners catcher Cal Raleigh singled in the first inning to reach base safely for a career-best 20 straight games.
Mariners right-hander Logan Gilbert (0-1) struck out 10 in five innings.
Tigers right-hander Casey Mize will start Tuesday against Seattle ace Logan Gilbert (0-0, 1.29 ERA).
In February, seven men from Chile were charged in Florida federal court with orchestrating burglaries at the homes of prominent professional athletes around the country.
Seattle relievers Gregory Santos, Trent Thornton, and Munoz combined to allow just one hit over the final three innings.
Seattle has scored four power-play goals in their last three games.
Seattle starter Logan Gilbert struck out eight and allowed just two hits in seven innings.