In his first 85 games as a Royal, Nori Aoki interspersed patches of success with spates of disappointments and moments of slapstick.

He fielded a foul ball with his groin. He swung at a pitch that hit him. He disappointed team officials with his defense, lost his spot at the top of the batting order and only recently regained his place there.

During these tumultuous four months and change, before the fifth inning of Tuesday’s 12-2 romp over the Diamondbacks, Aoki had still not hit a home run. He added that feat to his resume with a first-pitch swing, turning on a 95-mph fastball from reliever Bo Schultz and hooking a grand slam down the right-field line.

He grinned as he rounded the bases, overcome with what he later called “one of the best feelings in the world.”

It was Aoki’s first grand slam in the majors, and the third of the season for his team. The slam capped an eight-run burst in the inning, the first occasion in club history in which the team hit a three-run homer and an additional grand slam, and allowed the Royals to cruise in the series opener at Chase Field.