The 24-year-old right-hander was pounded for eight runs and 10 hits in three-plus innings Wednesday during a 12-10 loss to Atlanta, allowing a pair of two-run home runs to Clint Sammons.
Sammons, hitting .462 in spring training, homered in the second and fourth innings. He connected on a slider and a fastball.
Kendrick, who has 21 regular-season wins as a starter since June 2007, is competing with Chan Ho Park, J.A. Happ and Carlos Carrasco to be the No. 5 starter.
John Mayberry Jr. hit his third home run of spring training in the fourth and hit a two-run double in a five-run fifth.
He is batting .290 as he tries to earn a roster berth.
"I'm just letting them play," Phillies manager Charlie Manuel said when asked about the handful of players battling for a bench spot.
"We haven't even started talking about that yet. We're just putting them out there and letting them play."
NOTES: Philadelphia closer Brad Lidge made his debut in a game this year in a five-inning intrasquad contest. Lidge allowed one hit -- a solo home run -- and struck out Pedro Feliz in one inning. ... Feliz, also playing his first game of spring training, was 1-for-2. Feliz had back surgery in November. ... Carlos Ruiz (Panama) and Matt Stairs (Canada) returned to the Phillies from the World Baseball Classic on Wednesday after their teams were eliminated. Stairs hit a pinch-single in the fifth against Atlanta.