Mazzaro gave up six runs and eight hits, including an Adam Lind three-run homer, in the fourth inning of the
Royals' 6-3 loss to the Blue Jays on Tuesday.
Mazzaro's final line in his spot start was 13 hits and six runs in 5 1/3 innings. In his previous start, June 22 against the Cardinals, Mazzaro was roughed up for seven runs on six hits in 1 1/3 innings.
Put them together, and they earned Mazzaro a demotion to Class AAA Omaha after Tuesday's game.
"He wasn't slated to throw through the All-Star break, so we'll get another arm in here," manager Ned Yost said.
Yost did not announce which pitcher would be replacing Mazzaro, who is 3-3 with a 5.70 ERA.
Mazzaro was mum after the poor outing and his option to the Pacific Coast League, refusing to speak to reporters. He had recently been moved to the Royals' bullpen, but he made the spot start Tuesday because the team played a doubleheader Saturday.
Jason Bourgeois went 1-for-2 with a two-run triple, and he is hitting .462 (6-for-13) on the road trip. Bourgeois' three-hit game Monday matched a career high. It was his ninth three-hit game.
Eric Hosmerwent 0-for-4 to snap his eight-game hitting streak and drop his average to .233. Hosmer hit .433 during the streak.
Jeff Francoeur did have a single in three at-bats Tuesday night, but he has been struggling. He is 3-for-23 (.130) on the road trip, and he was dropped to the seventh slot for only the second time this season.
Luis Mendoza, who makes his first career start Wednesday at Toronto, is coming off perhaps the best start of his career. He went a career-high eight innings and held the Twins to one run and five hits in a 4-3 victory Friday.
Jose Mijares worked a spotless eighth inning and struck out one. In his past 21 appearances, Mijares has a 0.55 ERA, allowing one earned run in 16 1/3 innings while striking out 14 and yielding only 11 hits.
BY THE NUMBERS:
25-32-- Record of the Royals' starting pitchers. The bullpen is 11-11.
QUOTE TO NOTE: "They put a six spot up, and that kind of takes the wind out of you."
Billy Butler, after the Royals' 6-3 loss to the Blue Jays.