Once you have created your player and started playing in Career mode, every match you win will earn XP points. Disable the auto save feature. Once you reach Junior level, you will start getting 50, 70, or 100 XP points per match. You can accrue the XP points of two or three tournaments and spend them in the player area. When you finish improving the desired areas, save the player improvements, then exit Career mode without saving your career progress. When you play Career mode again, the tournaments you played will be available to be played again, as well as the player improvements.