Yahoo Sports reports: Matt Chapman joined some select San Francisco baseball company — including Willie Mays — with his massive day at the plate on Friday. The 33-year-old third baseman hit his fourth career grand slam, a three-run homer and added a sacrifice fly to finish with a career-high eight RBIs in the Giants' 18-3 rout of the slumping Chicago Cubs. The eight RBIs tied the Giants' San Francisco-era individual game record, shared by five others.