| - | Brandon Alford | P | RK | 6-3 | 225 | Right | Left | 10/31/1982 | 22 | Marshall,Texas | 2001 | 31 | 921 | TEX |
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| - | Adam Beseda | P | Ind | 6-4 | 220 | Right | Right | 7/29/1982 | 22 | Conroe,Texas | | UDFA | | |
| - | Brent Brooks | P | NCAA | 6-3 | 190 | Right | Right | 1/4/1982 | 23 | Lufkin,Texas | | UDFA | | |
| - | Zach Duncan | P | NCAA | 5-10 | 195 | Right | Right | 12/20/1983 | 21 | Marshall,Texas | | UDFA | | |
| - | Isa Garcia | 2B | AA | 5-10 | 180 | Right | Right | 8/20/1984 | 20 | Houston,Texas | 2006 | 34 | 1036 | STL |
| - | Mark Gilbert | IF | NCAA | 6-3 | 210 | Right | Right | 1984 | 21 | Huntsville,Texas | | UDFA | | |
| - | Zach Golden | P | NCAA | 6-1 | 180 | Right | Right | 11/10/1983 | 21 | Houston,Texas | | UDFA | | |
| - | Chris Gressett | P | NCAA | 6-0 | 180 | Left | Left | 1983 | 22 | Iola,Texas | | UDFA | | |
| - | Kolin Hatfield | OF | NCAA | 6-0 | 220 | Right | Right | 1985 | 20 | Cypress,Texas | | UDFA | | |
| - | Matt Heinrich | P | NCAA | 6-2 | 190 | Right | Right | 1985 | 20 | | | UDFA | | |
| - | Thomas Jakober | P | NCAA | 5-11 | 190 | Left | Left | 1983 | 22 | Orange,Texas | | UDFA | | |
| - | Sean Jones | OF | NCAA | 6-0 | 194 | Right | Right | 1986 | 19 | Houston,Texas | | UDFA | | |
| - | Karl Krailo | 1B | NCAA | 5-11 | 220 | Right | Right | 1985 | 20 | | | UDFA | | |
| - | Matt Langwell | P | AAA | 6-3 | 215 | Right | Right | 5/6/1986 | 19 | College Station,Texas | 2008 | 11 | 351 | CLE |
| - | Cody Lott | P | NCAA | 6-0 | 180 | Right | Right | 7/8/1986 | 18 | Spring,Texas | | UDFA | | |
| - | Robert Manuel | P | MLB | 6-3 | 190 | Right | Right | 7/9/1983 | 21 | Houston,Texas | 2005 | UDFA | | NYM |
| - | Jesse Marshall | P | Ind | 6-5 | 200 | Left | Left | 1985 | 20 | Montgomery,Texas | | UDFA | | |
| - | Brian Martin | P | NCAA | | | | | | - | | | UDFA | | |
| 15 | Dustin Martin | RF | AAA | 6-2 | 210 | Left | Left | 4/4/1984 | 21 | Corpus Christi,Texas | 2006 | 26 | 784 | NYM |
| - | Cameron McGuire | C | Ind | 6-3 | 205 | Right | Right | 9/29/1983 | 21 | Grand Prairie,Texas | 2003 | 48 | 1409 | BAL |
| - | Roydrick Merritt | P | AAA | 6-0 | 187 | Left | Left | 9/22/1985 | 19 | Houston,Texas | 2007 | 29 | 903 | NYM |
| - | Tyson Mire | OF | NCAA | 6-0 | 190 | Right | Right | 1986 | 19 | Round Rock,Texas | | UDFA | | |
| - | Travis Pasket | P | NCAA | 6-0 | 180 | Left | Left | | - | | | UDFA | | |
| - | Adam Perry | C | NCAA | 5-11 | 200 | Right | Right | 1986 | 19 | Sugar Land,Texas | | UDFA | | |
| - | Stephen Price | P | NCAA | 6-0 | 170 | Right | Right | 1986 | 19 | Spring,Texas | | UDFA | | |
| - | Alex Pujols | C | NCAA | 6-1 | 210 | Right | Right | | - | Houston,Texas | | UDFA | | |
| - | Aaron Ruchti | C | NCAA | 6-5 | 220 | Right | Right | 1983 | 22 | Houston,Texas | | UDFA | | |
| - | Jose Salazar | IF | AAA | 5-10 | 170 | Left | Right | 12/30/1983 | 21 | Monclova,Mexico | 2006 | UDFA | | STL |
| - | Jonathan Stone | 3B | NCAA | 6-2 | 210 | Right | Right | | - | Richmond,Texas | 1998 | 39 | 1162 | SD |
| - | Marcus Thornton | P | Ind | 5-10 | 185 | Right | Right | 12/6/1983 | 21 | Shepherd,Texas | | UDFA | | |
| - | Ryan Trevino | OF | NCAA | 5-10 | 206 | Right | Right | 1985 | 20 | Humble,Texas | | UDFA | | |
| - | Todd Twardowski | IF | NCAA | 5-8 | 160 | Right | Right | 1985 | 20 | Waller,Texas | | UDFA | | |
| - | Josh Warren | IF | NCAA | 6-1 | 195 | Right | Right | 1985 | 20 | Humble,Texas | | UDFA | | |