The Dodgers' first-round pick went 3-for-5 and scored twice Saturday, helping the Rookie-level Ogden Raptors defeated the Grand Junction Rockies, 7-4.
Batting fifth, Seager singled in the second inning, singled again and scored in the fourth and got another base hit and scored in the sixth. He grounded out in the seventh and ninth.
"I was just looking for a fastball and got a couple," Seager said. "I put some good swings on it and, luckily, it found a hole."
Seager signed with the Dodgers on June 30 and went 1-for-3 with a walk and a run scored in his pro debut with Ogden on Friday.
"That was really exciting," Seager said. "I've been waiting for it since last Saturday and I finally got in and I finally got to play. First two innings, I was nervous. The game was going a little fast, but after the second, everything kind of slowed down and it was all right."
Seager is the younger brother of Mariners infielder Kyle Seager, who was taken in the third round of the 2009 Draft. With six years difference between them, Kyle has had plenty of experience to pass along.
"From picking colleges to talking about how pro ball is a grind, but it's still fun and that I should enjoy it," Seager said of the advice he received from his older sibling. "He said, 'It's a long season and you gotta go every day and be ready to play, but it's a fun season.'"
The 18-year-old shortstop was expected to attend the University of South Carolina before the Dodgers signed him.
Jose Capellan doubled twice and drove in two runs, while Alex Santana had two RBIs for the Raptors, who snapped a three-game losing streak.
Ogden starter Jake Hermsen, a 28th-round pick, allowed two runs on four hits and struck out five over six innings but did not figure in the decision.