After days off allowed the Milwaukee Brewers to skip the No. 5 spot in the starting rotation the last two turns, they decided to make a change Thursday.

The Brewers optioned right-hander Mike Fiers to Class AAA Nashville and recalled right-hander Hiram Burgos from that club. Burgos, 25, will make his major-league debut by starting Saturday against the Chicago Cubs at Miller Park.

Fiers, 27, took one turn in the fifth spot but pitched so poorly against Arizona (five innings, nine hits, six runs) that manager Ron Roenicke opted to skip him the next two times. Fiers moved to relief duty but did not throw the ball well Tuesday night (1 1/3 innings, two hits, one walk, one run) against San Francisco.

It has been a continuation of the late-season collapse in Fiers' rookie 2012 season. After going 8-6 with a 2.88 ERA in 16 starts, he stumbled to a 1-4 mark and 7.09 ERA over his final six outings.

Fiers is slated to make his first start Saturday in the Sounds' rotation spot previously occupied by Burgos.

"There's nothing surprising in this game," said Fiers. "I didn't start out the season well, so I'm definitely the odd man out to go down. They need someone right now that's reliable. I guess they feel right now I'm not that guy so I need to get better.

"They're sending me to Nashville. It's not the end of the world. I've still got to pitch well and prove myself and come back up and pitch again. It's on me to pitch well and get back up here as soon as possible. I've got to go down there and start and do what I've always done."

Burgos, who performed well for Puerto Rico in the World Baseball Classic during spring training, was throwing the ball the best of the starting pitchers in Nashville. He was 0-2 with a 2.70 ERA in three starts, with a 1.08 WHIP and a .200 opponents batting average.