The widespread popularity of sports and entertainment forces marketers in this industry to implement Undifferentiated marketing

This statement is true.

Undifferentiated marketing focuses on an entire target market rather than a segment of it. It is a product, brand or service that targets everyone (as opposite to differentiated marketing that creates different offers for different target markets). This strategy employs a single marketing mix : one product, one price, one placement, one promotion, in order to reach the maximum number of consumers in that target market.

This marketing strategy is based on the belief that many consumers in the overall market have similar needs for the product.

In sports in entertainment forces, people tend to have similar tastes/preferences as, for example, most people like the newest version of a phone. Thus, one commercial campaign for a specific type of a phone is usually enough. Sports clothes and equipment are in most parts similar and can be marketed undifferentiated, so are sports events.