If the team and Prado cannot agree on a number in what is his final arbitration year, there will be a hearing in February to determine his salary for the 2013 season.
Atlanta has not had to go to an arbitration hearing with a player since it did with John Rocker in 2001.
In his final year of arbitration, O'Flaherty will earn $4.32 M, which includes award bonuses. The left-handed, who will be a free agent after this year, is coming off of a productive 2012 in which he posted a 1.73 ERA, 3.27 FIP, and held left-handed hitters to a .305 OPS.
Venters, who was eligible for arbitration for the first time this year, will earn $1.625M in 2013.
Also a first time arbitration eligible player, Heyward will make $3.65M in 2013 after a 2012 season that saw the 23-year old win a Gold Glove for his defense in right field while also putting together a 20-20 season at the plate. His deal also includes awards bonuses.
Medlen's breakout 2012 season earned him $2.6 M for 2013 in what was his first arbitration year as well. The right-hander posted a 1.57 ERA, 2.42 FIP, and was worth almost four wins above replacement according to Fangraphs.
The terms of Martinez's deal aren't available at this point.