The playoff-bound San Francisco Giants blew a six-run lead, and then rallied for a 9-8 victory over the San Diego Padres on Thursday night to stay within one game of Pittsburgh for the top spot in the NL wild-card standings.San Diego Padres' Yasmani Grandal rounds the bases after hitting a grand slam, while San Francisco Giants pitcher Jean Machi stands on the mound during the seventh inning of a baseball game in San Francisco, Thursday, Sept. 25, 2014.San Francisco Giants pitcher Yusmeiro Petit watches San Diego Padres' Yasmani Grandal round the bases on a solo home run during the sixth inning of a baseball game in San Francisco, Thursday, Sept. 25, 2014.San Diego Padres' Will Venable rounds the bases after hitting a two-run home run against San Francisco Giants during the sixth inning of a baseball game in San Francisco, Thursday, Sept. 25, 2014.San Diego Padres' Will Venable is congratulated by teammate Cory Spangenberg, right, after hitting a two-run home run against San Francisco Giants during the sixth inning of a baseball game in San Francisco, Thursday, Sept. 25, 2014.