The San Diego Chargers have signed draft picks Melvin Ingram, Kendall Reyes and David Molk to four-year contracts. Financial terms weren't immediately available.||||||| Ingram, an outside linebacker from South Carolina, was San Diego's first-round pick and Reyes, a defensive end from Connecticut, was taken in the second round. Both are expected to upgrade San Diego's defense, which was the worst in the NFL at stopping opponents on third down. Molk, an All-American center from Michigan, was taken in the seventh round.