Mariners Spring Training 2023: New MLB rules, full schedule

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MLB Network on new baseball rules

MLB Opening Day 2023: Season previews, schedule and analysis - ESPN

MLB rule changes: Takeaways from the first weekend of spring training, with shorter games, more stolen bases

MLB season 2023: Predictions, new rules, schedules, news and analysis - Sports Illustrated

Padres' 2023 Spring Training schedule released

Commentary: Mariners begin 'normal' spring training amid optimism and concern

Seattle Mariners - Wikipedia

Braves-Nationals, Giants-Yankees to open 2023 Major League Baseball season

MLB Opening Day 2023 recap: Baseball season begins with new rules

MLB season 2023: Predictions, new rules, schedules, news and analysis - Sports Illustrated

MLB 2023 rule changes: pitch timer, larger bases, shifts