With the 2011 minor league season complete we check in on the progress of each of the Seattle Mariners preseason Top 15 prospects as ranked by our prospect ranker J.P. Schwartz. The post season grading report was done by the publisher of Top Prospect Alert, not Mr. Schwartz, and reflects only the 2011 season and not future upside or downside of the individual prospect. Our 2012 preseason rankings will be published in the coming months.

#1 Dustin Ackley GRADE: A

Ackley batted .273 with 16 Doubles, 7 Triples, 6 Home Runs and 36 RBI’s for the Mariners. He walked 40 times and struck out 79 times in 90 big league games. In the minors, Ackley batted .303 with 17 Doubles, 3 Triples, 9 Home Runs and 35 RBI’s for the Triple-A Tacoma Rainiers.

#2 Michael Pineda GRADE: A

Pineda went 9-10 with a 3.74ERA for the Mariners. He walked 55 and struck out 173 in 171 innings. Opposing major league hitters batted just .211 against Pineda.

#3 Nick Franklin GRADE: B-

Franklin batted a combined .281 with 13 Doubles, 7 Triples, 7 Home Runs and 26 RBI’s between the Rookie League AZL Mariners (three rehab games), the High-A High Desert Mavericks, and the Double-A Jackson Generals. He walked 30 times and struck out 80 times in 88 at-bats.

#4 Alex Liddi GRADE: A-

Liddi batted .259 with 32 Doubles, 3 Triples, 30 Home Runs and 104 RBI’s for Triple-A Tacoma. He walked 61 times and struck out 170 times in 138 games. In 15 big league games with the Mariners, Liddi batted .225 with 3 Doubles, 3 Home Runs, and 6 RBI’s.

#5 Johermyn Chavez GRADE: C-

Chavez batted .216 with 16 Doubles, 4 Triples, 13 Home Runs and 50 RBI’s for Double-A Jackson. He walked 49 times and struck out 124 times in 126 games.

#6 Blake Beavan GRADE: B-

Beavan went 5-6 with a 4.27ERA in 15 starts with the Mariners. He walked 15 and struck out 42 in 97 innings of work. Opposing big leaguers hit .278 off Beavan. In the minors, Beavan went 5-3 with a 4.45ERA for Triple-A Tacoma.

#7 Guillermo Pimentel GRADE: B

Pimentel batted .265 with 10 Doubles, 11 Home Runs and 46 RBI’s for the Rookie League Pulaski Mariners. He walked 15 times and struck out 73 times in 65 games.

#8 Stephen Pryor GRADE: B

Pryor went a combined 3-1 with a 4.71ERA and 10 saves between High-A High Desert and Double-A Jackson. After posting a 7.67ERA in High-A, Pryor dominated in Double-A posting a 1.19ERA and holding opponents to a .123 batting average. Overall he walked 33 and struck out 61 in 49.2 innings of work.

#9 Ji-Man Choi DID NOT PLAY

Choi missed all of 2011 with a shoulder injury.

#10 Marcus Littlewood GRADE: D+

Littlewood batted a combined .192 with 13 Doubles, 2 Triples, 9 Home Runs and 36 RBI’s between the Short-A Everett AquaSox and the Low-A Clinton Lumberkings. He walked 55 times and struck out 104 times in 89 games.

#11 Carlos Peguero GRADE: B-

Peguero batted .196 with 3 Doubles, 2 Triples, 6 Home Runs and 19 RBI’s in 46 games for the Mariners. In the minors, he hit .317 with 15 Doubles, 2 Triples, 13 Home Runs and 47 RBI’s in 57 games for Triple-A Tacoma.

#12 Taijuan Walker GRADE: A

Walker went 6-5 with a 2.89ERA for Low-A Clinton. He walked 39 times and struck out 113 times in 96.2 innings. Opposing batters hit just .202 against Walker on the season.

#13 Greg Halman GRADE: C+

Halman batted .299 with 14 Doubles, 1 Triple, 3 Home Runs and 15 RBI’s for Triple-A Tacoma. He walked 13 times and struck out 53 times in 40 games. With the Mariners, Halman hit .230 with 2 Doubles, 1 Triple, 2 Home Runs and 6RBI’s in 35 big league games.

#14 Brandol Perez GRADE: DID NOT PLAY

Perez did not play in 2011.

#15 Dennis Raben GRADE: A

Raben hit .330 with 23 Doubles, 3 Triples, 18 Home Runs and 75 RBI’s for High-A High Desert. He walked 28 times and struck out 76 times in 76 games. His season ended in late June with a knee injury that kept him sidelined for the remainder of the season. Raben’s grade reflects his work prior to the season ending injury.