Rookie Jarred Kelenic homered, doubled twice and wrapped up his impressive series, leading the Seattle Mariners over the Kansas City Royals 7-1 on Sunday.
Kelenic also walked and scored twice.
Kelenic, who entered the season as one of the top minor league prospects in baseball, went 5 for 9 with three home runs, two doubles, three walks and seven RBI in the three-game series.
The Royals were ensured their fifth straight losing season. Royals star Salvador Perez, who came into the game tied with Jose Abreu with 113 RBI and second in home runs with 45, was 0 for 4 with two strikeouts.
Jackson Kowar (0-4) struggled again, giving up five runs on seven hits in four innings. He walked three and struck out three.
The Royals head to Cleveland Monday for a doubleheader against the Indians starting at 3:10.