The Chicago White Sox have reached an agreement to sign Cuban prospect Luis Robert, a source confirmed to ESPN's Jerry Crasnick.

Robert's deal with the White Sox is expected to be worth at least $25 million, as first reported Saturday by Fox Sports.

Robert, a 19-year-old outfielder who is listed at 6-foot-3 and 185 pounds, has been on the radar of major league teams since he was 15.

The Nationals have agreed to terms with star right fielder Bryce Harper on a contract for the 2018 season, the team announced Saturday.

Harper will make $21.625 million next season, as first reported by FanRag Sports and confirmed by ESPN.

The agreement locks up Harper for his final arbitration-eligible year. He can become a free agent after the 2018 season.