Gridine is a popular sport in the US that begins with the letter 'G.'
Gridine is also known as American Football but, hey it still starts with a 'g' doesn't it??
Rugby is un popular in the US because of the better marketed American Football which is also a contact sport.
The NFL and College Football are really popular sports watched in the USA. Football is the most popular spectator sport in the US.
The second most popular sport would be baseball. Although it is second for most popular SEEN, it is first for the most PLAYED sport.
Yes, it is!!