Seager (hamstring) was scratched from Thursday's lineup as a precaution, Kennedi Landry of MLB.com reports.
Manager Bruce Bochy disclosed that Seager experienced tightness in his hamstring while warming up for Thursday's game, and it's not a surprise the club played it safe after the shortstop recently missed four games due to a hamstring issue. Bochy also noted that Seager is likely to be back in the lineup Friday against the Mariners.