SAN FRANCISCO — Only one player compared to Brandon Belt in Tony Vitello ‘s eyes. Clayton Kershaw . “The easiest way to put it is he and Kershaw were arguably the best two lefties in the state of Texas and, therefore, at the time, the country, too, really,” the Giants manager recalled from when he recruited the Giants’ beloved first baseman to the University of Missouri. The Giants honored former first baseman Brandon Belt on Saturday. AP That’s right: First baseman. And in the conversation with Kershaw. Belt, 38, put a ribbon on a 13-year big-league career — all but one in San Francisco — with a celebration in his honor before the Giants hosted the Marlins on Saturday. He never officially announced his retirement, but he hasn’t been on a big-league roster since 2023. Sign up for the California Morning Report newsletter California's top news, sports and entertainment delivered to your inbox every day. Thanks for signing up!…