Unlikely pinch-hitter shows how thin injuries have made Yankees

SAN FRANCISCO — Having to use Cameron Maybin and Thairo Estrada because DJ LeMahieu and Gio Urshela left the Yankees’ 11-5 win Sunday over the Giants with injuries, Boone used starting pitcher J.A. Happ as a pinch hitter for Domingo German in the seventh inning and he grounded out. Luke Voit’s walk in the first…