In baseball, Spring Training is a series of practices and exhibition games preceding the start of the regular season. Opening Day marks the beginning of the Major League Baseball regular season. Giancarlo Stanton, a New York Yankees outfielder, is experiencing elbow issues. - Giancarlo Stanton reported to Yankees spring training with soreness in both elbows. - The elbow issue is described as similar to 'tennis elbow' or tendinitis. - Manager Aaron Boone is unsure if Stanton will be ready for Opening Day. - Stanton has been dealing with the elbow soreness since last season, with it worsening after the All-Star break. - Trent Grisham is also behind in camp due to a hamstring issue, but his injury appears less serious.