Frieri was named a Texas League All-Star.

Ernesto Frieri went 10-9 with a 3.59 ERA across 27 games, including 26 starts, with the San Antonio Missions. In 140.1 innings, he allowed 125 hits, walked 62 and struck out 118. He held the opposition to a .237 average. The opposition stole 16 bases off him in 19 attempts. He allowed 13 homers, hit four batters, tossed six wild pitches, and induced 11 double play grounders. The opposition hit .214 off him in 117 at-bats with runners in scoring position. Frieri placed eighth in the Texas League in ERA, fourth in walks, and third in strikeouts.

2008

Frieri went 8-6 with a 4.00 ERA across 33 games, including 18 starts, with the Lake Elsinore Storm. In 123.2 innings he allowed 125 hits, 32 walks and struck out 108. He allowed 14 homers and induced five double play grounders while holding the opposition to a .262 average.

Frieri went 1-0 with a 1.50 ERA across one start with the Portland Beavers, giving up two hits, two walks and striking out seven.

Frieri went 1-0 with a 4.09 ERA across two starts with the San Antonio Missions. In 11 innings he allowed seven hits, two walks and struck out 10. He allowed three homers while holding the opposition to a .184 average.

2007

Frieri went 1-2 with a 2.64 ERA over 40 appearances for the Fort Wayne Wizards. In 64.2 innings he allowed 48 hits, walked 23 and struck out 65. He also stranded 20 of the 27 runners he inherited and held the opposition to a .209 average. He was promoted to Lake Elsinore after his August 2 appearance.

Frieri went 1-0 with one save and a 1.13 ERA over 13 games, including one start, with the Lake Elsinore Storm. In 21.2 innings he allowed 11 hits and walked six while striking out 27. He allowed one homers and tossed one wild pitch. He saw the opposition steal three bases off him in six attempts.

Frieri went 0-0 with a 7.56 ERA over seven Storm playoff games. In 8.1 innings he allowed seven hits, walked seven and struck out 17.

2006

Ernesto Frieri went 3-3 with two saves and a 3.93 ERA in 26 games for the Eugene Emeralds. In 36.2 innings he allowed 31 hits, walked 15 and struck out 38. The opposition hit .237 off him with three homers.

Frieri went 0-0 with a 6.00 ERA in two games for the Lake Elsinore Storm from July 3-9. In six innings he allowed eight hits, walked three and struck out four.

Frieri made one appearance with the Fort Wayne Wizards, allowing four runs, one earned, on one hit and five walks in an inning of work.

2005

Making his first appearance in the United States, Frieri went 7-1 with a 1.17 ERA over 17 appearances for Peoria, including five starts. In 46.1 innings in the desert, he struck out 59 while walking 29.

Frieri also went 0-0 with a 2.70 ERA in two late-season appearances for the Lake Elsinore Storm.