The Cardinals tacked on two more runs in the fifth, which began with a bunt single by pitcher Joe Kelly. Consecutive doubles from Daniel Descalso and Matt Carpenter gave the Cardinals a 4-0 lead.
Still trying to convince the Marlins he deserves a place in their rotation, Turner gave up seven hits in five innings. He threw 64 pitches, 42 for strikes. All three of his spring starts have come against St. Louis, whose manager, Mike Matheny, once coached Turner in high school.
The Cardinals used Tuesday's game to get another look at the two pitchers competing for the fifth spot in their rotation. Shelby Miller made the start and breezed through four innings. He walked one, allowed one hit and ended his day by retiring 11 straight. Miller threw 31 of his 43 pitches for strikes.
Kelly followed, but wasn't as sharp. His outing lasted only three innings, and the Marlins knocked Kelly around for six hits (all singles) and four runs in the seventh inning. Placido Polanco capped the scoring with a two-run single, while Juan Pierre and Adeiny Hechavarria also had RBI hits.
Kelly contributed at the plate, though. His two-out, RBI single off Marlins reliever Chad Qualls in the sixth proved to be the game-winner.
Up next: Wade LeBlanc, competing for the fifth-starter spot, gets the nod when the Marlins play host to the Nationals at 1:05 p.m. ET on Wednesday at Roger Dean Stadium. Chris Young will start for Washington. LeBlanc is in the mix for a rotation spot with Kevin Slowey and John Maine. The game can be followed live on Gameday.
Jenifer Langosch is a reporter for MLB.com. Read her blog, By Gosh, It's Langosch, and follow her on Twitter @LangoschMLB. This story was not subject to the approval of Major League Baseball or its clubs.