Chien-Ming Wang will throw live batting practice in Viera, Fla., on Friday, when he will fire 45 pitches from a mound in his second such session of rehab from shoulder surgery. The Nationals originally hoped Wang would make his 2010 debut in mid-June. While he has not experienced any setbacks, the Nationals have not been able to target a return date because of the unique nature of his injury, Rizzo said. Wang suffered a shoulder dislocation more typical for a football player, Rizzo said.