Kevin Plawecki, two others sent to minors with Noah Syndergaard

PORT ST. LUCIE, Fla. -- Noah Syndergaard wasn't the only premier prospect sent to the New York Mets' minor league camp Friday afternoon. Highly regarded catcher Kevin Plawecki also was demoted, along with right-handers Cory Mazzoni and Jon Velasquez.

Forty-two players remain in major league camp, including Zack Wheeler and Josh Edgin, both of whom will miss the entire season rehabbing from Tommy John surgery.

Plawecki is slated to open the season at Triple-A Las Vegas.

He hit .250 (5-for-20) with one homer, five RBIs and two walks in Grapefruit League play. Last season, Plawecki hit a combined .309 with 11 homers and 64 RBIs in 376 at-bats with Las Vegas and Double-A Binghamton.

Mazzoni had a 7.71 Grapefruit League ERA, but it was a far better camp than in 2014. On the final day of Grapefruit League play a year ago, Mazzoni started and suffered a right lat-muscle strain. The long rehab kept him from joining Vegas, where he had been ticketed to start the season, until July.

The Mets had considered converting Mazzoni to relief last season, where he figures to fit at the major-league level. But they were hesitant to change his role last season after the side-muscle injury.

Asked Friday if Mazzoni might now get that introduction to relief, Mets vice president Paul DePodesta said it is "under review" at the moment.

Velasquez, a Bronx native and former independent-ball pitcher, had a 3.86 ERA in four Grapefruit League appearances.