Betting guide for the MLB Wild Card Series The Major League Baseball (MLB) is not only the oldest but also one of the most significant sports events in the world. So much so that its organisers occasionally add changes to its structure every year to keep fans engaged. One of the most exciting prospects in 2023 is the return of the MLB Wild Card Games. The Wild Card Games (now called Wild Card Series) is an on-and-off-again part of the MLB.