Kennedy allowed two runs, including a solo homer to Grady Sizemore, over six innings, but the Cleveland Indians, behind Fausto Carmona's seven scoreless innings, beat the Diamondbacks 2-0 on Saturday.
"We penciled him in (to start), but wanted him to win the job," Diamondbacks manager A.J. Hinch said. "He's showed that he's ready."
The right-hander, acquired from the New York Yankees in a three-team trade, gave up five hits and struck out three.
Kennedy has a 2.79 ERA in five starts covering 19 1/3 innings with four walks and 13 strikeouts.
Carmona has been even more impressive. A 19-game winner in 2007 who struggled so badly in 2009 that he was sent to the minors, he is 3-0 with an 0.45 ERA.
"Amazing things will happen if he attacks the strike zone like this," Indians manager Manny Acta said. "He threw only 70 pitches, so he went to the bullpen for 15 more."
Carmona struck out three without a walk, allowing three hits.
"I threw a lot of four-seam fastballs, used the slider early and had a good changeup," said the 26-year-old, adding that he has moved slightly to the first-base side of the pitcher's rubber to start his delivery.
Catcher Mike Redmond said that's only one of a few adjustments made against Arizona's lineup that featured seven left-handed batters.
"This was a good test for him because in our division (AL Central), there are so many lefties," Redmond said. "I learned a lot, too, on what he can do to be effective against them.
"He wants to be a great pitcher. He has the stuff to do it and works hard," Redmond said. "My job is to stay on him to not try and do too much."
A year ago, Carmona tried harder and harder as losses mounted. He went 5-12 with a 6.32 ERA and spent seven weeks in the minors. Much of that time was spent with mental skills coordinator Julio Rangel on pre-pitch preparation.
"I don't think about last year anymore," Carmona said. "That's negative. I want to stay aggressive, focused on this year. I am ready for the season now."
Carmona will have one more spring start, Thursday night at Dodger Stadium.
Diamondbacks SS Stephen Drew went 1 for 3, and is hitting .419. He turned a soft hit to left-center into a double. ... OF A.J. Pollock, the Diamondbacks' first-round pick in 2009, had surgery on a broken right elbow. ... Sizemore, who had abdominal and left elbow surgery in September, is hitting .393 with two homers and 10 RBIs. He has reached base safely in 13 of his last 19 plate appearances -- eight hits and five walks. ... Not much keeps Hall of Famer Bob Feller from signing autographs throughout every Indians home game in spring training, but the 91-year-old took a proud pause to watch the U.S. Navy Leap Frogs parachute into the ballpark before the game. Feller served four years in the Navy during World War II.