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Prospects on deck as teams ready to expand rosters Reporter @JonathanMayo
Some of the best prospects in the game have been up in the big leagues for most, if not all, of the 2012 season. The top three on's Top 100 list at the start of the year -- the Rays' Matt Moore, the Nationals' Bryce Harper and the Angels' Mike Trout -- have long since graduated and are contributing to playoff contenders.

The Orioles' Manny Machado, the Marlins' Jacob Turner and the D-backs' Tyler Skaggs have more recently joined the above trio, and there's more to come with the expansion of rosters on Saturday. As even this sampling of a half-dozen shows, September callups are not just for clubs who are out of contention, just giving a young kid a chance. Several teams very much in the middle of a postseason race might look for help down on the farm.

There are some variables that come into play when trying to consider who might get the call. One is need: Does the Major League team need any help? Another is opportunity: Would the prospect get any playing time if he were to be called up? If his Minor League season is over, sometimes just sitting and watching big leaguers can be beneficial. But if a prospect's Minor League club is bound for the postseason, the organization has to weigh which experience is better in the long run. And finally, there's roster flexibility. Already being on the 40-man roster makes life easier, though teams have shown they're not afraid to create room for players not previously on the 40-man roster.

Using the Top 100 list as a guide (with their current rank in front of their names), here are the top 10 prospects who could -- or perhaps should -- get the call to the big leagues once rosters expand, focusing only on Minor Leaguers who have yet to spend a day in the big leagues.

2. Shelby Miller, RHP, Cardinals: The overall numbers may not look pretty, but look more closely at how he's thrown in the second half of his Triple-A season. The right-hander has a 3.04 ERA over 53 1/3 innings and has allowed only 43 hits (.216 opponents' batting average) and seven walks while striking out 61. In five August starts, Miller has struck out 44 and walked just four in 31 1/3 innings.

4. Jurickson Profar, SS, Rangers: There's been buzz about the 19-year-old shortstop being called up to join fellow infielder Mike Olt in the big leagues to help the big league club down the stretch. He's not going to be called upon to play short every day with Elvis Andrus entrenched at that position, but Profar can help out with his bat, his legs and with his glove at second, short or even third in a pinch. Profar isn't on the 40-man roster, but that hasn't stopped the Rangers from promoting prospects in the past.

7. Dylan Bundy, RHP, Orioles: Machado, the No. 3 overall prospect, is already up and contributing in Baltimore. Could Bundy be next? Just a year out of high school, the right-hander has already reached Double-A, and the O's have carefully monitored his workload. In the long run, there's no question Bundy is a starter, potentially at the top of any team's rotation, but he could definitely contribute using his power stuff in short stints out of the bullpen as Baltimore makes a playoff push. He's on the 40-man roster, so that's one hurdle already cleared.

11. Danny Hultzen, LHP, Mariners: The No. 2 pick from the 2011 First-Year Player Draft was making a beeline for Seattle, having reached Triple-A Tacoma in late June. He hasn't been as dominant there as he was with Double-A Jackson, struggling with his walk rate, though he's still missed plenty of bats. Hultzen's on the 40-man roster, so if the Mariners wanted to give him a taste to motivate him for a shot at winning a big league rotation spot in 2013, it would make some sense.

14. Wil Myers, OF, Royals: He might fall under the "Why hasn't this happened yet?" category, but keep in mind that Myers is just 21 and is playing in Triple-A for the first time. An ill-timed slump just after his triumphant XM All-Star Futures Game appearance in Kansas City probably didn't help, either. The slugger isn't on the Royals' 40-man roster yet, but room might be made for the man with 35 home runs this season, one behind the Minor League lead.

17. Nolan Arenado, 3B, Rockies: There was a good deal of talk about Arenado making the big club out of Spring Training, but he wasn't quite ready and went to Double-A Tulsa instead. While Arenado hit fairly well there, his power and run production dipped quite a bit, causing some pause. But don't look now; Arenado has hit .333 and slugged .531 in August, and the group currently manning the hot corner in Colorado shouldn't be seen as a huge obstacle.

23. Carlos Martinez, RHP, Cardinals: OK, so maybe this is wishful thinking, considering he's only 20, he's not on the 40-man and he has just 14 starts above A ball. But stranger things have happened and Martinez's power stuff would look very good coming out of the bullpen for a month as the Cards chase the Reds.

26. Billy Hamilton, SS, Reds: He's only played shortstop and there's no place for him to play in Cincinnati, but just having Hamilton on the bench as a pinch-running threat should be enough to warrant a call. All Hamilton has done in 2012 is set the Minor League stolen-base record with 154 (and counting) while hitting for average and getting on base across two levels.

35. Hak-Ju Lee, SS, Rays: Tampa Bay hasn't really had an everyday shortstop all year. The Rays like their positional flexibility, so that's somewhat by design. But while Lee isn't going to step in and start at the premium position daily during a playoff hunt, he could provide defensive insurance and some excellent pinch-running skills for the final month.

36. Jake Odorizzi, RHP, Royals: The starter for the U.S. squad in July's Futures Game, Odorizzi was expected to reach the Majors along with Myers before long. Aside from his last outing, the right-hander has been very solid with Triple-A Omaha. Even though he's not yet on the 40-man roster, Odorizzi deserves an audition for 2013 and he'll have to be added this offseason or be left eligible for the Rule 5 Draft.

Other Top 100 prospects to watch: Gary Brown, OF, Giants; Jedd Gyorko, 3B/2B, Padres; Grant Green, OF, A's

Jonathan Mayo is a reporter for Follow him on Twitter @JonathanMayo and Facebook, and listen to him on the weekly Pipeline Podcast.