The Iowa Cubs had quite a Sunday, producing 15 runs, smashing two grand slams and tallying eight hits.

And that was just the first inning.

The start of Iowa's second game of a doubleheader with the Nashville Sounds on Sunday couldn't have gone much better.

Iowa set a franchise record by pouring on 15 runs in the first inning. The 15 runs also tied the modern day Pacific Coast League record. Iowa's two grand slams in an inning also tied a PCL record.

And, boy, was that exciting ... for Iowa, at least. The Cubs batted through their lineup — twice — sending 18 hitters to the plate in the inning. Phillip Evans and Johnny Field both socked grand slams. The slam by Field set a franchise record for runs in an inning.

The previous mark was 12. Iowa accomplished the mark three other times: on Aug. 12, 2008, against New Orleans; Aug. 24, 2001, at Colorado Springs; and July 30, 2000, at Fresno.

"It was pretty crazy," Evans said. "I've never seen it or been a part of something like that. It was pretty wild."

Nashville needed three different pitchers to get through the inning.

And the day only got crazier from there, as the Cubs went on to tally a single-game franchise record 15 walks. When it was all said and done, the Cubs finished the day by belting four home runs. Oh, and they won the game, 19-5.

And it all kicked off with that big first inning.

"Guys were getting walks and getting knocks and everyone kind of kept passing to the next guy, it felt like," Field said.