After spending a week watching Arizona Fall League play at the beginning of October, I look forward to returning next week for the final games. The best prospects I saw on my first swing were obvious choices: Angels outfielder Jo Adell among the position players, Astros right-hander Forrest Whitley among the pitchers.

Who are some less heralded prospects who have helped themselves in the AFL? Let's take a look ...

First, a quick caveat about the Arizona Fall League. Don't read too much into small sample sizes in a league where the quality of the hitters always stands out much more than the quality of the pitchers. With that in mind ...

Pirates outfielder Jared Oliva isn't a Top 100 Prospect but he has raised his profile more than any Fall League position player while ranking among the leaders in several offensive categories. He stands out with his hitting ability and plus speed, and he also offers gap power and capable defense at all three outfield spots.

By contrast, Reds second baseman/third baseman Jonathan India has been a disappointment. The fifth overall pick in the 2018 Draft got off to a 1-for-32 start in the AFL and while he has fared better lately, he's still striking out in a third of his plate appearances. He has posted pedestrian numbers in his first two pro seasons and one scout who saw him with the Glendale Desert Dogs thought India looked less athletic than he remembered.

After winning high Class A California League pitcher of the year honors in 2017 and the Marlins' Minor League pitcher of the year award as an encore, right-hander Nick Neidert logged a 4.67 ERA in 13 starts this year. He missed three months after surgery to repair the meniscus in his right knee and lacked his trademark polish -- but he looks like his normal self in the Fall League. He's back to pounding the strike zone with a low-90s fastball with life, an effective curveball and a plus changeup.

Mets left-hander David Peterson didn't surrender an earned run until his fourth Fall League start, but the 20th overall pick in the 2017 Draft is giving up two baserunners per inning. He looked very ordinary when I saw him, sitting at 90-92 mph for three innings and not getting a single swing and miss with his fastball. Though his changeup is promising, I'm not sure he's anything more than a back-of-the-rotation starter.

After their first full pro seasons, who are your top five prospects in each demographic (position players and pitchers, college and high school) from the 2018 Draft?
-- Roger K., St. Albans, W.Va.

Several 2018 draftees are off to promising starts, and three rank among MLB Pipeline's 20 best prospects in the game: Tigers right-hander Casey Mize (No. 7), Mariners outfielder Jarred Kelenic (No. 13) and Giants catcher Joey Bart (No. 19). Here are my top-five rankings in each demographic:

College hitters
Joey Bart, C, Giants
Alec Bohm, 3B, Phillies
Nick Madrigal, 2B, White Sox
Nico Hoerner, SS, Cubs
Trevor Larnach, OF, Twins

College pitchers
Casey Mize, RHP, Tigers
Logan Gilbert, RHP, Mariners
Brady Singer, RHP, Royals
Daniel Lynch, LHP, Royals
Tarik Skubal, LHP, Tigers

High school hitters
Jarred Kelenic, OF, Mariners (drafted by Mets)
Nolan Gorman, 3B, Cardinals
Jordan Groshans, SS/3B, Blue Jays
Alek Thomas, OF, Diamondbacks
Triston Casas, 1B, Red Sox

High school pitchers
Matthew Liberatore, LHP, Rays
Grayson Rodriguez, RHP, Orioles
Ethan Hankins, RHP, Indians
Simeon Woods-Richardson, RHP, Blue Jays (drafted by Mets)
Ryan Weathers, LHP, Padres

Based purely on merit, there's no question in my mind that Madrigal (second base) and Robert (center field) are the White Sox's best options at their positions for 2020. They're two of the best prospects in baseball and had no trouble handling Triple-A pitching in August.

Though the White Sox have had seven consecutive losing seasons, they could make a run at a wild-card berth next year if they upgrade their rotation. In that case, it would behoove Chicago to play its best lineup starting on Opening Day. But service-time considerations will play a role in the decision-making, so it's more likely that Madrigal and Robert will return to Triple-A for a few weeks next April.

The easy answer would be one of the first two prospects on our Mets Top 30 because they're so young. Shortstop Ronny Mauricio wowed observers in the low Class A South Atlantic League at age 18 and third baseman Brett Baty was the No. 12 overall pick in this year's Draft at age 19. Neither one will be ready for New York at the start of 2021.

However, don't sleep on catcher Francisco Alvarez. He thrived in the Rookie-level Appalachian League at age 17, batting .282/.377/.443 and looking like a solid hitter with power and defensive ability to match. I'll go with Mauricio and I love Baty's bat, but it won't surprise me if Alvarez eclipses them both.