The Arizona Diamondbacks blew a seven-run lead and lost their 21st straight road game, one short of the major league record, when Mike Yastrzemski hit a grand slam in the eighth inning that lifted the San Francisco Giants to a 9-8 victory Tuesday night. Arizona was ahead 7-0 in the second inning, but couldn't hold it and lost its 12th straight overall. The Diamondbacks can match the record of 22 consecutive road defeats shared by the 1963 New York Mets and the 1943 Philadelphia Athletics when they play the Giants at Oracle Park on Wednesday night.