SAN FRANCISCO — Michael Busch hit a three-run homer into McCovey Cove beyond right field in the fifth inning to back Javier Assad’s strong start on the mound, and the Chicago Cubs beat the San Francisco Giants 5-1 on Friday night.Busch’s drive was the 176th splash hit at Oracle Park, 68th by an opponent and fourth by a Cubs player — first since Joc Pederson on June 3, 2021.Seiya Suzuki broke up a scoreless game with an RBI double in the fourth then scored moments later on Nico Hoerner’s sacrifice fly. Assad (4-1) struck out five, walked one and allowed three hits over six innings to win his third straight decision spanning seven starts. His throwing error on a pickoff attempt of Bryce Eldridge in the fourth could have been costly but the right-hander stranded Eldridge on third.Hoby Milner pitched the seventh and Trent Thornton the final two innings, surrendering Eldridge’s one-out homer in the ninth. Busch greeted reliever Erik Miller with his eighth home run after Chicago put runners aboard on Pete Crow-Armstrong’s double and a leadoff walk by Carson Kelly against Giants starter Landen Roupp (5-7). Roupp was tagged for fou …
