Marlins acquired Andrew Cashner and Colin Rea from Padres ... then gave Rea right back

The starting pitching market is beginning to heat up. San Diego Padres right-hander Andrew Cashner is the latest to be dealt, traded to the Marlins on July 29 along with fellow starter Colin Rea. Among those going back to the Padres is Miami's lone top-100 prospect, Josh Naylor.

UPDATE: With regards to Rea, he went 3 1/3 innings in his first start for Miami before being taken out of the game for a right elbow sprain. Shortly thereafter he was placed on the 15-day disabled list and on Monday Fox Sports' Ken Rosenthal reported that the team is sending Rea back to the Padres. As a result, Castillo is being returned to the Marlins with Rea headed back to San Diego.

In addition to Naylor, the Padres are receiving right-handed rookie ball pitcher Luis Castillo, according to Yahoo! Sports' Jeff Passan. Castillo is reported to hit triple digits with his fastball, and has an inconsistent slider that may work as an out pitch down the road. San Diego also gets righties Jarred Cosart and Carter Capps in the deal.

Cashner, 29, is just 4-7 with a 4.76 ERA on the season, but he seems to have peaked at the right time for San Diego to deal him, allowing five total runs in his last three starts, with 23 strikeouts and three walks in 17⅔ innings during that span.

The right-hander has spent time on the disabled list this season for both a strained right hamstring and a strained neck.

Marlins starting pitchers have a 4.05 ERA on the season, seventh in the National League.

The Baltimore Orioles, Texas Rangers, Miami Marlins, Toronto Blue Jays and Detroit Tigers have all been linked in some fashion to Cashner, with Texas and Miami emerging as front runners on Thursday night, per Ken Rosenthal of Fox Sports.

Padres general manager A.J. Preller last week wasn't yet ready to move on any offers.

"Nothing's really changed in terms of the trade deadline," Preller told Dennis Lin of the San Diego Union-Tribune on July 22. "Obviously, there's a lot of interest in him. Doesn't seem like a ton of pitchers are available. You've seen we've made a few trades (already), and we're obviously not in the top part of the standings. We think he's a quality major league pitcher. We're going to listen, but in order for it to make sense, it's going to have to be a deal that improves us for sure, in the short and long term."

Cashner is the fourth pitcher dealt this season by the Padres, who are mired near the bottom of the National League West for a sixth straight season. James Shields was shipped to the Chicago White Sox on June 4, reliever Fernando Rodney was traded to Miami on June 30 and Drew Pomeranz was sent to the Boston Red Sox during the All-Star break.

Cashner is making $7.15 million in 2016, with roughly $2.6 million remaining for the rest of the season.