Ladies and gentlemen, a list of 10 players to start your preseason “sleeper” lists for 2010.

Chances are, all 10 of these soon-to-be rookies and sophomores will be exposed and no longer “sleepers” in the truest sense of the word come next season, but that doesn’t make it any less important to know who they are.

Regardless of how hyped the top young players are, you must know what they are all about in order to compete. If you’re the only one in your league to know about their forthcoming stardom, great, you’ve got first dibs on their services. If every manager in your league is onto them, it’s just as vital to know who they are for the sake of keeping up with the Joneses.

Some of these guys — Andrew McCutchen, Tommy Hanson, Neftali Feliz and Rick Porcello — are making an impact right now. Their abilities have already been identified, but they still have plenty of ways to improve their games next season. A handful of others — Justin Smoak, Jason Heyward and Buster Posey, to name a few — are future stars who should get their shots at some point in 2010.

Get to know ‘em now. By the time 2010 drafts come around, you’ll be glad you did.

Andrew McCutchen, OF, Pittsburgh Pirates
McCutchen is an exciting player, something the Pirates organization desperately needed, even if his arrival came at the expense of All-Star center fielder Nate McLouth. The 22-year-old is mature for his age and makes adjustments quickly, which leads us to believe that any perceived weaknesses in his game — it’s hard to find any in fantasy — will be fixed quickly. McCutchen is hitting for more power than expected, and he has made good use of his speed with 15 steals in 18 attempts. He looks like a definite 20/20 player with the possibility for more, as soon as next season.

Neftali Feliz, SP, Texas Rangers
Feliz was already one of baseball’s top prospects entering this season, even before reaching the Major Leagues at age 21 and dominating as a reliever. With some tangible big-league results on hand — he currently has a 0.41 ERA and 0.31 WHIP — Feliz will be on lots of fantasy owners’ radars come next season. He still has to make the transition back into Texas’ rotation and deal with a hitter’s park in Arlington, but Feliz has all the tools to be a star right away.

Tommy Hanson, SP, Atlanta Braves
A late entry into the National League Rookie of the Year race, Hanson has been as good as advertised for the Braves. There have been a few bumps in the road in terms of his fantasy value, but the bottom line is that Hanson, 23, is competing like a veteran and winning starts. With a 9-3 record and six Quality Starts in his last eight outings, owners can deal with less-than-ideal totals in strikeouts and WHIP (1.25). Come next season, those numbers should improve dramatically, which would make Hanson a certified fantasy ace.

Rick Porcello, SP, Detroit Tigers
A few struggles shouldn’t come as a surprise for a 20-year-old rookie in the middle of a pennant race. Ultimately, we will look back on the 2009 season as a successful one for Porcello, though, who is fighting through inconsistencies and low pitch counts to make a run at 15 wins. With a full season under his belt, fantasy owners can rest assured that Porcello becomes more dominant in all phases of his game in 2010. Look for numbers in the ballpark of 16 wins, a 3.60 ERA, 1.20 WHIP and 150 strikeouts next season.

Justin Smoak, 1B, Texas Rangers
Smoak, 22, still has a long way to go to live up to his billing as the next Mark Teixeira. That fact became more clear when he struggled with the transition to Triple-A Oklahoma City this season, hitting .244 in 54 games. Smoak can rake, though, make no mistake about that. A switch hitter with 40-home run potential, Smoak will be one to watch in spring training position battles next season. Even if he doesn’t make the big league roster out of camp, Smoak will get to the show and produce early in 2010.

Jason Heyward, OF, Atlanta Braves
Heyward has “superstar” written all over him. In fantasy, it’s simply a matter of when he reaches the big leagues and claims an everyday job. Heyward is making child’s play of the Double-A Southern League, hitting .346 with seven home runs and 29 RBIs in 45 games, despite not turning 20 until late in the season. Heyward’s outlook in fantasy is picture perfect, with an advanced approach, five-tool potential, good character, size, strength and speed. For 2010, we just have to watch how quickly the Braves want to move him through their farm system.

Stephen Strasburg, SP, Washington Nationals
The Nationals have every intention of handling Strasburg with kid gloves, but the league’s worst franchise likely won’t be able to wait to put a Major League uniform on him. And Strasburg’s stuff plays, no matter where he’s pitching. Strasburg regularly pumps his fastball into triple digits and commands a plus-breaking ball, which according to most scouts, is good enough to be a top-of-the-rotation starter right now. Strasburg will garner a lot of attention in fantasy drafts next season, so his services will be difficult to obtain for a decent price tag.

Buster Posey, C, San Francisco Giants
The smart money is on Posey taking over everyday catching duties for the Giants next Opening Day. So long as he does, Posey will be well worth a mid-round pick in fantasy drafts. The 22-year-old is advanced for his age and capable of hitting in the big leagues immediately. Questions have lingered about his abilities to hit for power, but if 2009 is any indication, Posey should be fine in that department. AT&T Park certainly won’t help matters, but even as a rookie, we see Posey hitting .290 with 20 home runs.

Eric Young Jr., 2B, Colorado Rockies
Among the 2010 rookie class, no other player will have an impact in one category like Young will in stolen bases. The son of former Major Leaguer Eric Young, he will be a good bet to steal 50+ bases if playing time is in his favor. At the time of his Aug. 25 callup, Young was leading the Triple-A Pacific Coast League with 58 stolen bases, bringing his career minor league total to 303 steals in six seasons. If Young can find his way into the Rockies’ starting lineup next season, a .290 average and 50 stolen bases wouldn’t be out of the question.

Matt Wieters, C, Baltimore Orioles
Wieters hasn’t acclimated himself to the Major Leagues quite as quickly as fantasy owners would have liked. That sting of disappointment will prevent the 23-year-old from being overvalued next season, when Wieters will surely break out. He is a big, strong switch-hitter with power from both sides of the plate and a favorable hitter’s park in Baltimore’s Camden Yards. We’ll go out on a limb and GUARANTEE 30 home runs and 100 RBIs for Wieters next season, which will place him among the elite at his position.