Left-hander holds San Francisco scoreless for eight innings but Don Mattingly goes to closer Javy Guerra to secure 1-0 win for fear of overextending the ace of the staff.Reporting from San Francisco — Clayton Kershaw had outlasted Tim Lincecum and was on the verge of pitching a shutout against the defending World Series champions in their home park. The Dodgers' closer was in double A only two months ago.