Getty Yankees first base prospect Ernesto Martinez Jr. holds bat over shoulder in spring training amid strong early-season performance. A little-known Yankees offseason signing is suddenly forcing a closer look at the team’s first base situation after a scorching start at Triple-A. The Yankees appear to have their first base situation settled with Ben Rice taking primary duties after his 26-homer season last year, and veteran Paul Goldschmidt on a one-year, $4 million contract returning to be