Boxing and wrestling matches were more likely to be broadcast in the early days of television for a few reasons:
1. Boxing and wrestling matches were easier to broadcast because they were simpler and more contained events. They didn't require multiple camera angles or elaborate sets like baseball and football did.
2. Licensing fees are fees that networks have to pay for the rights to broadcast a particular sporting event. In the early days of television, baseball, and football were becoming increasingly popular and lucrative, and their licensing fees were correspondingly high. So, in the early days of television, boxing, and wrestling matches were more affordable to broadcast because they didn't require expensive licensing fees.
3. Boxing and wrestling were already popular sports with a dedicated fan base, so it made sense for early television networks to showcase them in order to attract viewers. Boxing and wrestling were two of the most widely-followed sports in the United States at the time, with many fans attending matches in person and following the results in newspapers and other media. Television networks recognized the popularity of these sports and saw an opportunity to build their audiences by broadcasting matches live to viewers at home.
4. Boxing and wrestling matches were also more readily available for broadcast because they weren't tied to exclusive broadcasting contracts, which were common in other sports at the time. This means that multiple networks could broadcast the same match without any legal restrictions or competition from other networks.