mlb 08/13/07 5:57 PM ET Jonathan Mayo is a senior reporter for]]> Next week, when the deadline has come and gone and we know who has signed and who hasn't, I'll go into more detail about the fantasy impact of the Class of 2007. For now, though, the regular smorgasbord of Minor League fantasy offerings ...

In the bigs

I feel like I have to at least mention Joba Chamberlain every week now, no? As expected, he did make his big-league debut. So far, so good. Aside from a couple of walks in his first outing, he's made a seamless transition to the bullpen, having allowed just one hit and struck out six in four innings. How much fun was it seeing him come in back of Phil Hughes in Cleveland the other day? The future is now, or something clichéd like that. At any rate, Chamberlain is a must-get in keeper leagues of all varieties, but as Joe Torre gains more confidence in him, he'll become a setup man who could at the very least help AL-only players with strikeouts, WHIP and, if you're lucky, a win here and there.

In Colorado, Jeff Baker got hurt, leading the Rockies to call up Ian Stewart for the first time. Stewart's been on the map for a long time, but some injuries along the way caused his star to fade some. That said, he's just 22 and hitting the bigs, so who can complain, especially since he bounced back with nice numbers at Triple-A this year? He may not hit for as much power as scouts once projected, or it might take some time for him to do so at the big-league level, but for those of you in keeper leagues who need a guy to get to Majors in order to stash him, he's worth holding onto. It doesn't look like he'll get that much playing time now, but he'll definitely be back in September.

A couple of guys who have been up previously are back up for some more PT. Brendan Ryan has done a nice job in limited looks, and with Adam Kennedy hitting the disabled list, he should play plenty at second base. Owners should take a look, especially those of you in NL-only leagues, because he can play a little and has shown a little pop from the middle infield. Plus, if you have a five-game eligibility rule, he qualifies at three positions. The Giants called Dan Ortmeier back up when they dealt Mark Sweeney. The outfielder played all weekend, including a start at first base, perhaps a sign of the Giants trying to get him more at-bats to help determine his role in 2008. Nothing to get excited about fantasy-wise yet, but keep an eye on the Giants box scores to see how he's doing.

A phone call away

My apologies for not discussing Steven Pearce in more detail this season. The Pirates first-base prospect began the year in the Class A Advanced Carolina League and has bashed his way to Triple-A and a probable September callup. For the season, Pearce has hit a combined .339 with 29 homers, 33 doubles and 104 RBIs. He's slugged .644 while striking out only 63 times. Did I mention he's stolen 14 bases? He's been outstanding in Triple-A so far, with the challenge of a higher level not being a big deal. Obviously, Adam LaRoche is in the way in Pittsburgh, but the Pirates have had Pearce playing the outfield some in anticipation of a callup. If he plays, he could help out an NL-only team this year with how hot he's been. At the very least, he's a definite keeper candidate in deep leagues.

We have discussed Evan Longoria in the past, but he's moved up into the "phone call" category. After hitting .307 with 21 homers in 105 Double-A games, he's kept on getting it done in Triple-A, hitting .303 and slugging .576 in his first 10 games. He could be helping a lot of teams out in the big leagues now, but I'm not sure how the Rays will make room for him. He could be a September callup, but it's more important to note where he is because he's now in line to nab a job at the start of the 2008 season.

A year away

You knew it was going to happen sooner or later. An injury delayed it some, but Cameron Maybin is now in Double-A. The Tigers' center fielder of the not-too-distant future joined Erie in time to help the club make a run at an Eastern League playoff spot after hitting .304 with 10 homers and 25 stolen bases in High A ball. He hasn't missed a beat, going 4-for-10 in his first three games with a home run in each contest. That's a 1.300 slugging percentage for those of you scoring at home.

First baseman Aaron Bates isn't the same kind of prospect Maybin is, but he did just join him in the Eastern League. The North Carolina State product in the Red Sox system put up silly numbers in the hitter-friendly California League with a .332 average, 24 homers and 88 RBIs. He's 23, so he needs to show he can handle a higher level. He's had only two games so far and one hit in Double-A, but it was a home run. He's definitely got power; it's just a question of whether it will play at higher levels.

Perhaps the most interesting promotion to Double-A came when the Dodgers jumped Clayton Kershaw from Low A up to Jacksonville as the Suns prep for another playoff run in the Southern League. The lefty is legit with a 2.77 ERA, a .203 batting average against and 134 strikeouts in 97 1/3 innings pitched in the Midwest League. His first Double-A start was so-so, though he still struck out four in 4 1/3 innings. It definitely puts the 19-year-old on the fast track, and the Dodgers don't hesitate to push young arms quickly, so keeper leaguers, nab him now.

One note on Andrew McCutchen, a guy who's been in Double-A all year and is really figuring things out. The Pirates outfield prospect hit just .240 with a .660 OPS in the first half, but since the break, he's hit .300 and raised his OPS to .814. He's also gone 16-for-17 in steal attempts on the year, and he's still ahead of the curve as one of the more exciting all-around prospects in the game.

Down the road

As promised, a look at some 2007 draftees, highlighting a trio of first-rounders who could move quickly.

Two of them are arms -- one starter and one possible closer of the future. The starter is No. 6 overall pick Ross Detwiler. The Nats' lefty made his debut in the Carolina League (that's High A) recently. Not bad, considering the amount of innings he threw in college this year. He gave up a bunch of hits but otherwise had a decent debut, allowing two runs in 4 2/3 innings. He's a southpaw with good command (3 BB in 16 2/3 pro IP so far), but he's got above-average stuff (17 Ks). The fact that he's in the Carolina League now could mean he begins next year in Double-A, and with the Nats needing pitching help, he may not actually be that far down the road.

The Rockies took Casey Weathers with the hope he could help soon. So far, so good. He went straight to full-season Asheville and posted a 2.35 ERA in seven games. More impressive is that he's given up just two hits in 7 2/3 innings (.080 batting average against) while striking out 14. He still hasn't been pitching very long, so he could make a huge leap forward next year and has the kind of power stuff that will play at the back end of a 'pen soon.

Finally, we'll throw in a bat, that of Indians' first-rounder Beau Mills. The son of Red Sox bench coach Brad Mills put up silly numbers in his final year of college. He's hitting only .266 overall so far, but he's shown the same penchant for driving in runs that he did in college. He's driven in 34 runs overall, 33 in 39 games since he joined full-season Lake County. He's hit .346 in August, perhaps a sign of more good things to come.