Four right-hander pitchers -- Julian Hilario, Cory Mazzoni, Paul Sewald and Rob Whalen -- join middle infielder Matt Reynolds and Nimmo. Mazzoni (No. 14) and Reynolds (No. 20) join Nimmo as the ranked prospects in that group.
"It's not always your top prospects that go to the Arizona Fall League. It can depend on a variety of considerations," general manager Sandy Alderson said. "Some of the players we want to see because they're closer [to the Majors] or because they've made some progress and we want to see if that can be consolidated.
"There may be cases where a player has been injured part of the year, and we want to get more at-bats or innings in the Fall League where it makes sense."
Nimmo, 21, is hitting .246/.361/420 in 57 games with Double-A Binghamton. He earned a midseason promotion after putting together a first-half slash line of .322/.448/.458 with Class A Advanced St. Lucie.
Mazzoni, 24, owns a 4.70 ERA and 1.33 WHIP in eight starts for Triple-A Las Vegas. His teammate, the 23-year-old Reynolds, is putting together a very strong offensive campaign, including a .347/.411/.457 slash line and 55 RBIs while splitting time between Binghamton and Las Vegas.
Hilario (St. Lucie), Sewald (St. Lucie) and Whalen (Class A Savannah) are all still in the lower-level Minor Leagues.
The Scottsdale team is comprised of players from the Mets, Yankees, Phillies, Pirates and Giants. Two top-50 prospects on MLB.com's Top 100 list, pitcher Tyler Glasnow (No. 19) and infielder/outfielder Josh Bell (No. 32), both from the Pirates organization, will also play for the Scorpions.
The AFL runs for six weeks, Oct. 7-Nov. 15. The preliminary roster listed one Mets infielder as to be announced.
Tim Healey is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.