The Pittsburgh Pirates (57-39) will face off against The Washington Nationals (48-50) tonight in game one in their four game series. The Pirates are in second place in the National Central division while the Nationals are sitting in third place in the National League Eastern Division. MLB Baseball Betting Line: Washington Nationals (-134) Pittsburgh Pirates (124) Total = 8.5 When looking at some of the best online MLB Baseball betting sites for USA Players such as VietBET, Dan Haren is listed to start for the Nationals. Dan Haren is 4-10 with a 5.61 ERA. It looks like Charlie Morton will…