Back home and rested, David Ortiz isn't ready to look at the second half of the season as the final stretch just yet. Ortiz drove a three-run homer deep into the seats in right field and Rick Porcello remained unbeaten at home as the Boston Red Sox beat the struggling San Francisco Giants 4-0 on Tuesday night. It was the 23rd homer and first since the All-Star break for Ortiz, who is keeping Boston in contention for another title in his farewell season.