ST. LOUIS — Cardinals right-hander Lance Lynn threw to the right base in the fourth inning. The problem was, he threw right to the actual base, hitting it with the baseball while trying to start an inning-ending 1-6-3 double play. The ball skipped away for an error, handing the San Francisco Giants a run and a big opportunity for more. Desperate to win and stay alive, the Giants responded with three more runs, which was more than enough for lefthander Barry Zito, who shut down the Cardinals over 7 2/3 innings in a must-have 5-0 victory in Game 5 of the NLCS. The Cards still lead the series 3-2, but the final two games will be played in San Francisco starting Sunday night. Lynn had been rolling, retiring nine of his first 10 batters, including five strikeouts, but Marco Scutaro and Pablo Sandoval led off the fourth with line-drive singles to right field. Lynn came back with another strikeout, overmatching Buster Posey, and Hunter Pence followed with a weak dribbler back to the mound. All the Cards needed to do was execute. But Lynn looked casual throwing to second, and shortstop Pete Kozma appeared to be late covering the bag (perhaps because he was positioned well left of...