First baseman Dominic Smith was ranked the No. 2 prospect by both outlets, the No. 41 overall by MLB.com and No. 49 overall by Baseball America. RHP Justin Dunn was ranked fourth in the organization (No. 100 overall by Baseball America).
Baseball America ranked shortstop Andres Gimenez fifth, catcher Tomas Nido sixth, LHP Thomas Szapucki seventh, outfielder Brandon Nimmo eighth, RHP Merandy Gonzalez ninth and RHP Chris Flexen 10th.
MLB.com ranked Gimenez fifth, Szapucki sixth, outfielder Desmond Lindsay seventh, RHP Marcos Molina eighth, Gonzalez ninth and infielder Gavin Cecchini 10th.
Aside from Nimmo, who has played in 47 career major-league games, Rosario and Smith, "there aren't that many big league-ready options in the upper minors for the Mets," Baseball America's J.J. Cooper writes.
Peterson, who signed for a $2.99 million signing bonus after the Mets drafted him 20th overall in June, went 11-4 with a 2.51 ERA with the University of Oregon this season, including a 20-strikeout performance against Arizona State.
Rosario and Smith were ranked Nos. 1 and 2 in Baseball America's preseason top 10 list for the Mets, while Dunn was ranked third in the list. Baseball America dropped Lindsay, Cecchini, RHP Robert Gsellman and RHP Gabriel Ynoa from its preseason list.
Rosario is hitting .329 with seven home runs, 53 RBIs and 17 stolen bases in 88 games with Triple-A Las Vegas this season, while Smith is hitting .337 with 15 home runs and 66 RBIs in 100 games.