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David Murphy, OF, Rangers

David Murphy has been a key to the Rangers' robust run-scoring so far, with a .284 average, six homers and 28 RBIs in the team's first 45 games. The problem is, his Minor League track record does not support this level of production, nor his 22 extra-base hits, nor his .491 slugging percentage. The lefty-swinging outfielder hit only .273 with a .407 slugging percentage over 500 career Minor League games, and at the age of 26, it's unrealistic to think his sudden improvement is sustainable. Murphy is a useful extra outfielder in AL-only and deep mixed leagues, nothing more.

-- Cory Schwartz, Host, "MLB.com Fantasy 411"

Blake DeWitt, 3B, Dodgers

DeWitt has been a nice find so far on waiver wires, but I feel his run is coming to an end. We need to factor in that he's only 22 and that Nomar Garciaparra, Russell Martin and super-prospect Andy LaRoche -- who is doing quite well at Triple-A Las Vegas -- have legit claims to third base. DeWitt will probably go back to being a solid backup and spend some time on the Vegas-to-Chavez Ravine shuttle.

-- Mike Siano, Host, "MLB.com Fantasy 411"

If there's one rookie hitting well above his head, it's Blake DeWitt. Surprising as his hot start may be at the hot corner, where Andy LaRoche and Nomar Garciaparra were supposed keep things steady, this Cinderella story won't last. Not once over five Minor League seasons did DeWitt deliver a .300 average or a .500 slugging percentage. What's more, he had only 182 at-bats above Class A, which really goes to show just how much he's getting by on pure talent in Tinseltown. Look for everyone and everything -- namely, opposing pitchers, LaRoche and Garciaparra -- to catch up to DeWitt in the coming weeks.

-- Alex Cushing, Reporter, MLB.com Fantasy

DeWitt had a couple of solid seasons in the Dodgers organization, blasting 19 home runs in 2006 and batting .292 with 14 homers and 66 RBIs across two levels in 2007. But even though he's a former first-round Draft pick, his track record is hardly indicative of a player capable of batting .300 with a .500-plus slugging percentage right away in the Majors. It's a long season, and I'm guessing DeWitt's production will slow down once pitchers get a better handle on his tendencies and weaknesses.

-- Tim Ott, Reporter, MLB.com Fantasy

DeWitt unexpectedly became a starter after Spring Training injuries to fellow youngster Andy LaRoche (thumb) and veteran Nomar Garciaparra (hand). Dewitt's numbers are impressive (.318 AVG, 4 HR, 21 RBIs, 21 R, .518 SLG), but he has never maintained a .300 batting average or .500 slugging percentage in any extended Minor League stint. Considering this is his first go-round in the Majors, he will experience some droughts as he gets acclimated to Major League pitching. Garciaparra returning to full health and/or LaRoche getting promoted from Triple-A could threaten Dewitt's long-term playing time.

-- Kyle Stack, Reporter, MLB.com Fantasy

Armando Galarraga, SP, Tigers

Expect Armando Galarraga's fairy-tale season to end soon. With his 2.55 ERA, the 26-year-old rookie has been one of the few bright spots for the Tigers during a disappointing year. But considering his 4.72 Triple-A ERA from last season and the impending return of starter Dontrelle Willis from the disabled list, the Little Big Cat's 15 minutes of fame are surely ticking.

-- Dave Feldman, Reporter, MLB.com Fantasy

Hiroki Kuroda, SP, Los Angeles Dodgers

Hiroki Kuroda's ERA and WHIP are quite good at this point, but I do not expect them to remain this way, primarily because his home run rate is likely to go up as the season progresses. He is a pitch-to-contact sort who is presently keeping the ball down, but was more of a fly-ball pitcher in Japan. In addition, his HR/FB ratio is a bit lucky, and this is not a park effect as, contrary to popular belief, Dodger Stadium is a favorable home run park. Finally, as spring turns to summer, the additional travel endured over here will take its toll, along with the strain of working every five days as opposed to every six or seven like he has in the past.

-- Todd Zola, Correspondent

Talk to me about Kuroda's no-hit bid on May 11, and I'll show you lots and lots of sliders and a thoroughly confused Astros lineup. That's been the M.O. for the 33-year-old rookie hurler, who's not exactly dominant and relies on a smattering of breaking pitches to keep hitters off balance. While that strategy has earned him six quality starts thus far, a closer look at Kuroda's stats -- a .255 average against and five homers allowed in 54 innings over eight starts -- reveals nothing more than a middle-of-the-road hurler, not the second coming of Hideo Nomo. Don't be surprised to see him suffer a lapse as NL West teams begin to figure him out.

-- Corey Gottlieb, Reporter, MLB.com Fantasy