Triunfel was signed as a non-drafted free agent on September 23, 2006 by the Seattle Mariners. He began the 2007 season with the Class-A Wisconsin Timber Rattlers. He had back-to-back three-hit, two-RBI games on May 11 and May 12. He recorded 14-multi-hit games, including five three-hit games. He was named to the Midwest League All-Star team, but did not play due to injury. He hit .303 during season-high seven-game hit streak from July 12 to 18 and recorded a career-high six hits, all singles on July 30 against the Inland Empire 66ers, becoming just the second Maverick in club history to post six hits in a 9-inning game since Mike Berry in 1996. He participated in the Arizona Fall League after the season.\n', '

In his second season in 2008, Triunfel spent the season with the Class-A Advanced High Desert Mavericks. He led team with 30 stolen bases, ranking tied for third among all Mariners\' minor leaguers. He recorded an 11-game hitting streak from April 28 to May 9. Triufel hit a grand slam home run, going three-for-five with two runs scored, a double, a home run and four RBI on July 21. He recorded five consecutive multi-hit games from July 19 to 23 and was named California League Player of the Week in mid-July. Triunfel recorded a season-high 13-game hitting streak, batting .382 with 20 runs scored, seven extra-base hits and 10 RBIs from July 25 to August 8. \n', '

Triunfel was sidelined for most of the 2009 season with a broken tibia. In limited time he hit .238 in 11 games. In 2010 with the West Tennessee Diamond Jaxx he hit .257 in 129 games. He began 2011 with the AA Jackson Generals and hit .281 in 105 games prompting a late season promotion to the AAA Tacoma Rainiers.\n', '

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