Top Prospect Promotions: Paxton, Nelson, Schoop

Check here for today's promotions of top prospects around baseball….

• The Mariners have called up left-hander James Paxton, Don Ruiz of the Tacoma News Tribune reports.  Paxton, 24, was ranked before the season as one of the game's top prospects by MLB.com (57th) and Baseball America (#87) and he has posted a 4.45 ERA, 8.1 K/9, 2.26 K/BB rate over 145 2/3 innings in his first taste of Triple-A this year.  The southpaw is the second top M's pitching prospect this week to receive a promotion, after Taijuan Walker.  Paxton is under team control through the 2019 campaign and he'll have to be added to Seattle's 40-man roster.
• The Brewers have called up right-hander Jimmy Nelson, manager Ron Roenicke told reporters (including MLB.com's Adam McCalvy).  Nelson, a second-rounder from the 2010 draft, has been a starter for the last three seasons but the Crew will use him as a reliever.  MLB.com ranked Nelson as the top prospect in the Brewers system and the 88th-best prospect overall, saying that the 24-year-old has "a heavy fastball that elicits ground balls and sits in the low 90s."  Nelson posted a 3.25 ERA, 9.6 K/9 and 2.51 K/BB rate in 27 starts at Double-A and Triple-A this season, though he didn't perform quite as well at Triple-A.  Since he's being called up at this late date in the season, Nelson won't gain Super Two status and will be under team control through 2019.
• The Orioles have called up middle infielder Jonathan Schoop, according to David Hall of the Virginian Pilot (Twitter link).  Schoop was ranked as the 50th-best prospect in baseball by ESPN's Keith Law (ESPN insider subscription required) before the season and MLB.com ranks him as the fourth-best prospect in the Baltimore organization.  Schoop, 21, hails from Curacao and has gradually evolved from a shortstop to a second baseman over his five minor league seasons could possibly be Brian Roberts' replacement at the position in the Major Leagues.  Schoop was limited to 285 PA at Triple-A Norfolk this season due to a stress fracture in his back, and he hit .255/.298/.397 with nine homers for the Tides.  He will be under team control through 2019, as Schoop's late callup won't give him Super Two status.  Besides Schoop, the O's have also called up Henry Urrutia and right-hander Josh Stinson.
• As expected, the Reds have purchased the contract of outfielder Billy Hamilton, according to a tweet from his now-former club, the Triple-A Louisville Bats. Hamilton currently stands as the 17th-best prospect in baseball, according to MLB.com's Jonathan Mayo. The 22-year-old burner has scuffled somewhat in his first season at Triple-A, seeing his on-base percentage drop to a career-low .308 mark and carrying a .651 OPS. Nevertheless, he has swiped 75 bases in 90 attempts, added some pop (he has a career-best six home runs), and transitioned from shortstop to center field. Baseball Prospectus has a full scouting report on Hamilton (subscription required) as he reaches the bigs for the first time.
• The White Sox have brought up two of the organization's top prospects, Dan Hayes of CSNChicago.com tweets. In addition to well-regarded youngster Marcus Semien, the club has purchased the contract of righty Erik Johnson, who John Sickels of Minor League Ball ranks as the 76th-best prospect in the game. Though he missed the top-100 list of MLB.com's Jonathan Mayo, Johnson did appear at the number two slot among White Sox prospects, with Mayo explaining that he has the repertoire to become a mid-rotation starter. The 23-year-old has an excellent 1.57 ERA over 57 1/3 innings since reaching Triple-A, where he maintains a 8.9 K/9 ratio against 3.0 BB/9.