The Dodgers have signed undrafted free agent Christian Oliveira, a 6-foot-4, 18-year-old pitcher out of Somerville, Massachusetts, sources told Dodgers Nation's J.P. Hoornstra on Saturday. Oliveira had been committed to the University of Massachusetts but will forgo that commitment in favor of the Dodgers' $150,000 signing bonus. The Dodgers have signed undrafted free agent right-hander ...