San Francisco Giants right-hander Tim Lincecum has no structural damage in his tight back and is expected to be available when the World Series resumes with Game 3 on Friday night. ''That's the plan,'' athletic trainer Dave Groeschner said via text message late Thursday with word an MRI exam on Lincecum's back was all clear. The two-time NL Cy Young Award winner was walked off the field by Groeschner during the eighth inning of San Francisco's 7-2 loss at Kansas City in Game 2 when his left lower back tightened. Lincecum retired five straight before exiting during Salvador Perez's at-bat.