The San Francisco Giants get an opportunity to ease what they hope will be a healthier Buster Posey back into the lineup as a designated hitter when they continue a six-game series against the Oakland Athletics on the American League side of the San Francisco Bay on Friday night. Giants rookie right-hander Dereck Rodriguez (4-1, 2.89) and A's veteran righty Edwin Jackson (1-1, 2.59) are set to duel in the opener of the second half of the series, after Oakland took two of three in San Francisco leading into the All-Star break.