MIAMI -- When dealing with prospects, even high-end ones, there is at least a degree of risk. To the Marlins, the fact that Jazz Chisholm has a strikeout rate of 33.8 percent at Double-A wasn’t a deal breaker.

On Wednesday, the Marlins acquired Chisholm from the D-backs for right-hander Zac Gallen, who already was cementing a big league rotation spot.

Essentially, it was a rare straight-up, prospect-for-prospect deal. Chisholm, a left-handed-hitting shortstop, was Arizona’s top prospect, per MLB Pipeline. He is now Miami’s No. 4 prospect and MLB's 59th overall prospect.

With immense natural talent, Chisholm projects as the Marlins' shortstop of the future.

“I think you can put whatever ceiling you want on him,” president of baseball operations Michael Hill said. “When you talk about his total package and what he brings to the table -- his Gold Glove defense, his power from a position that you don't expect power, his athleticism -- the sky’s the limit when you talk about what he’s able to do on a baseball field.”

The downside is Chisholm’s numbers slipped this season at Double-A Jackson, where he had a slash line of .204/.305/.427. But he has 18 home runs, 44 RBIs and a wRC+ of 114.

Strikeouts are a concern. When he starts playing for Miami’s Double-A Jacksonville affiliate, he carries with him a high strikeout rate.

“We’re aware of the strikeout rate,” Hill said. “We're excited to get him into our system and into our development program and take care of him.”

In their second trade of the day, the Marlins acquired outfield prospect Jesus Sanchez and big league right-hander Ryne Stanek from the Rays for right-handers Trevor Richards and Nick Anderson.

Stanek is on the 10-day injured list with right hip soreness.

Sanchez, ranked as Miami’s No. 3 prospect and 42nd overall, is joining Triple-A New Orleans. At Double-A and Triple-A, the left-handed-hitting outfielder is hitting .263/.323/.389 with nine homers and 54 RBIs.

“Jesus Sanchez, we feel, is another impactful top 50 talent in all of baseball,” Hill said. “He’s a tremendous addition for this organization.”

Worth noting

• The Marlins still haven’t announced who will fill Gallen’s rotation spot, which comes up Monday as part of a doubleheader at the Mets. A couple of candidates at New Orleans are Robert Dugger and Hector Noesi. Manager Don Mattingly said the organization plans on being careful in developing, not rushing prospects.

“Instead of having a guy you would say, 'This guy could be good,' and dragging him out of somewhere and he’s not quite ready, we want to let our guys get ready to compete and continue their development,” Mattingly said. “So when they get here, they can be a productive big league starter.”

• The Marlins promoted right-handed reliever Kyle Keller from New Orleans on Thursday, and he will get his first big league experience. Keller made 35 appearances and had a 4.73 ERA with the Baby Cakes.

“He’s a guy with a big arm,” Mattingly said. “A guy who has been putting it together in Triple-A this year. So we’re going to get a look to see how he handles his first attempt at the big leagues and see how his stuff is going to play.”

• Injury update: Pablo Lopez (right shoulder strain) will throw a rehab assignment game on Friday at Jacksonville. Reliever Austin Brice (right forearm flexor strain) will have a rehab appearance on Friday at Class A Advanced Jupiter, and Drew Steckenrider (right elbow inflammation) will begin a rehab assignment on Thursday with Jupiter.