The action begins at 3:35 p.m. ET when Peoria and right-hander Kyle Zimmer, the Royals' No. 2 prospect, visits Surprise and right-hander Taijuan Walker, whose last start was a complete game for the Mariners in the midst of their pennant race.
At the same time Tuesday afternoon, Glendale and shortstop Corey Seager, the Dodgers' No. 1 prospect, will host Mesa and shortstop Addison Russell, the Cubs' No. 2 prospect. The day ends with another pitchers' duel, as right-hander Tyler Glasnow, the Pirates' No. 1 prospect, will take the mound for Scottsdale at 9:35 p.m. ET at Salt River, facing right-hander Archie Bradley, the D-backs' No. 1 prospect.
Games with that level of talent are commonplace in the AFL, where 23 players ranked on MLBPipeline.com's Top 100 Prospects list will play this season.
For the second year in a row, Byron Buxton, baseball's top ranked prospect, is among the top prospects playing in the desert this fall. Last year, the Twins' No. 1 prospect hit .212/.288/.404 in 12 games as a 19-year-old for Glendale. This year, he will be playing for Salt River as he tries to make up for lost time after missing most of the regular season due to injuries.
Buxton played in just 31 games during the regular season. A wrist injury he suffered during Spring Training delayed his start to the season and continued to hamper him throughout the first half with Class A Advanced Fort Myers. Then, in his first game after being promoted to Double-A New Britain in August, he suffered a concussion in a harrowing outfield collision and was sidelined for the final three weeks of the season.
Now healthy again, Buxton will be one of the most-watched players in the AFL. But his is far from the only storyline to watch over the next six weeks.
Making up for lost time
Like Buxton, several other players are headed to Arizona to make up for time they lost to injury during the regular season. Others who are taking advantage of the extra developmental time include outfielder Jesse Winker, the Reds' No. 2 prospect, and shortstop Tim Anderson, the White Sox's No. 2 prospect.
Many of the starting pitchers in the AFL are there because injuries prevented them from reaching their innings caps during the regular season. Bradley, Glasnow, Zimmer and Walker all spent part of this season on the disabled list, as did right-handers C.J. Edwards, the Cubs' No. 5 prospect, and Roberto Osuna, the Blue Jays' No. 5 prospect.
Recent Draft picks
Last year, just four months after he was selected second overall in the 2013 First-Year Player Draft, the Cubs sent third baseman Kris Bryant to the AFL. He hit .364/.457/.727 with six home runs in 20 games. He was named MVP and helped Mesa to the league championship game. That performance helped serve as a springboard for his historic '14 season, when he hit 43 home runs and reached Triple-A.
It is unlikely any player will be able to repeat Bryant's spectacular performance this season. But three members of the '14 Draft class will play in the AFL, led by shortstop Trea Turner, the Padres' No. 5 prospect. He was selected 13th overall in June and hit .323/.406/.448 with five home runs and 23 stolen bases in 69 games between short-season Eugene and Class A Fort Wayne.
In addition to the small group of '14 draftees, several members of the '13 Draft class will play in the AFL. Right-hander Mark Appel, the first overall pick last year, headlines the group. The Astros' No. 2 prospect had a rocky start to his first full professional season, but pitched much better after his promotion to Double-A Corpus Christi in July. He will try to build on that progress while pitching with Salt River this fall, where he joins Bradley and Buxton to form one of the most star-studded rosters in the league.
Pace of play
Major League Baseball announced last week a set of experimental rules designed to speed up the pace of play would be used in the AFL this year.
• A hitter must keep one foot inside the batter's box throughout his plate appearance, unless one of a few exceptions, such as a foul ball, occurs.
• Intentional walks will be called for by the manager and the batter will automatically take first base.
• There will be a maximum break of two minutes, five seconds between innings, with hitters required to be in the batter's box by the one-minute, 45-second mark. If either team doesn't comply, a ball or strike will be assessed accordingly.
• There will be a maximum of two minutes, 30 seconds allowed for pitching changes, including those that occur during an inning break. A ball will be called if a team takes too long.
• Each team will be permitted three "timeout" conferences covering any meeting involving pitchers and catchers, managers, coaches and batters. Timeouts during pitching changes and those that result from an injury or other emergency will not be counted toward the limit. Additionally, at Salt River home games, a 20-second pitch clock will be used. Those games will also include instant replay, as MLB continues to study potential modifications to the review system.
The experimental pace of play initiatives continue the AFL's tradition of being a testing lab for MLB's potential rule changes. Last year, the instant replay system was debuted in the AFL.
Position changes often happen in a less-competitive environment than the AFL, but the league gives players who are moving around the diamond another chance to get experience.
This year, Josh Bell, the Pirates' No. 3 prospect, will be the most prominent player learning a new position. He has exclusively played the outfield in the Minor Leagues, but the Pirates already have a star-studded trio of young outfielders in the big leagues. So, this fall, Bell will try out first base, where he began taking ground balls during the regular season.
Although Peter O'Brien, the D-backs' No. 7 prospect, won't be changing positions when he catches for Salt River this fall, his progress defensively will be closely watched by evaluators. The 24-year old was a catcher in college, but has played four positions since the Yankees drafted him in the second round in '12.
The D-backs acquired O'Brien at the non-waiver Trade Deadline in exchange for Martin Prado, but injuries limited him to four games with his new club. The D-backs are sending him to the AFL as a catcher, and how he performs behind the plate over the next six weeks could inform his ultimate defensive home.
No matter where O'Brien ends up defensively, his offensive prowess gives him a chance to reach the Major Leagues. He hit 34 home runs in 106 games this season, ranking fifth among Minor Leaguers.
MLB.com's Top Prospects in AFL
1. Byron Buxton, OF, Twins
4. Francisco Lindor, SS, Indians
5. Addison Russell, SS, Cubs
9. Archie Bradley, RHP, D-backs
13. Corey Seager, SS, Dodgers
16. Tyler Glasnow, RHP, Pirates
29. Josh Bell, 1B, Pirates
38. Raul Mondesi, SS, Royals
40. Jesse Winker, OF, Reds
41. Mark Appel, RHP, Astros
47. Kyle Zimmer, RHP, Royals
49. D.J. Peterson, 3B, Mariners
53. C.J. Edwards, RHP, Cubs
60. Brandon Nimmo, OF, Mets
71. Hunter Renfroe, OF, Padres
82. Tim Anderson, SS, White Sox
84. Nick Williams, OF, Rangers
85. Daniel Robertson, SS, A's
86. Hunter Dozier, 3B, Royals
87. Miguel Almonte, RHP, Royals
88. Dalton Pompey, OF, Blue Jays
96. Trea Turner, SS, Padres
98. Matt Olson, 1B, A's