Batista, 40 in February, turned in a 3.70 ERA with 6.0 K/9 and 4.9 BB/9 for the Nationals last season. In 16 major league seasons with eight different clubs, Batista owns a 4.51 ERA with 5.8 K/9 and 4.1 BB/9.
Snell, 29, was part of a seven-player swap between the Mariners and the Pirates in 2009. The hurler cleared waivers and accepted a Triple-A assignment after being DFA'd by the M's in June. Snell has a career 4.80 ERA with 7.2 K/9 and 4.2 BB/9.