Emmanuel Burriss was sent down to the AAA Fresno Grizzlies in June 2009 primarily due to his struggles at the plate and the need for the San Francisco Giants to make roster adjustments. At the time, Burriss was not performing well offensively, which led the Giants to seek alternatives for their infield positions.

In June 2009, Burriss was hitting just .213 with a .273 on-base percentage, which prompted the Giants to option him to Fresno to regain his form and get more consistent playing time. This move was part of a broader strategy to improve the team's performance and provide Burriss with the opportunity to develop further in the minor leagues.

If you need more detailed statistics or context about Burriss's career or the Giants' roster decisions during that period, feel free to ask!