PEORIA, Ariz. — San Diego Padres pitcher Mat Latos has a sore right shoulder, putting a potential opening-day start against St. Louis in jeopardy.

Latos said Friday his shoulder had improved significantly in the past 24 hours, but he won't make his next scheduled spring training start on Saturday.

Padres manager Bud Black said Latos complained of a sore shoulder and skipped Wednesday's bullpen session, two days after making his last start. Latos threw 90 pitches in four-plus innings against the Chicago White Sox on Monday, allowing three earned runs on eight hits and three walks.

Latos had increased mobility in his shoulder Friday after the team's medical staff spent Thursday treating what it identified as an inflamed bursa sac."From what it was yesterday, it's literally night and day," Latos said. "Yesterday it felt like everything locked and as if there was a huge piece of glass or something sharp inside my shoulder. There was no strength to lift it."

The injury caught Latos by surprise because he felt as good as he had all spring in Monday's start and again while playing catch on Tuesday.

"For me to not feel a pinch or anything and one day my arm is dead is weird," he said. "Bewildering."

Black has not announced an opening-day starter, but the 23-year-old Latos had been in line to pitch the season opener Thursday at St. Louis. Black said the injury "just popped up" and the team will see how it plays out.

Latos was 14-10 with a 2.92 ERA in a career-high 31 starts last season and finished tied for eighth in NL Cy Young Award voting. The right-hander lost his last five starts, including one on the final day of the regular season to the San Francisco Giants that knocked the Padres out of playoff contention.

Prior to his final five starts, Latos set a major league record by limiting opponents to two earned runs or less in five or more innings in 15 straight starts.

"You can't fast-forward time," Latos said. "You've just got to take your time and worry about what's going on now."

In other news Friday, the Padres released infielder Kevin Frandsen.

A non-roster invite to camp, Frandsen was trying to win a backup job. He started the spring hitless in his first 18 at-bats but batted .216 overall with one homer and eight RBIs in 37 at-bats.

Frandsen, who spent time with the Salt Lake Bees last season, is a .243 career hitter in five major league seasons and has played for the San Francisco Giants, Boston Red Sox and Los Angeles Angels.

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SWEENEY RETIRES: Former slugger Mike Sweeney has signed a one-day minor league contract with Kansas City so he could officially retire as a member of the Royals.

The 37-year-old Sweeney was a five-time All-Star with the Royals. He played for Kansas City from 1995-2007 and spent his last three seasons with Oakland, Seattle and Philadelphia.

Sweeney finished with a .297 average, 215 home runs and 909 RBIs. His final at-bat came in the only postseason plate appearance of his career, and he singled last October for the Phillies.

The Royals said Friday that Sweeney will throw out the ceremonial first ball for the March 31 opener against the Los Angeles Angels. Sweeney also said he would remain with the Royals in some capacity to work with minor league players.

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