Tennis on Shabbat

Is one allowed to play tennis Shabbat?
Does it make a difference if it’s a clay court or hard court?

The Rav wrote a teshuva on this question in his Ohr Yitzchak volume 1 siman 155 where is says it is not allowed.

What about going to a baseball game during the week is that also forbidden because of bitul Torah if yes were does one draw the line of what kind of entertainment is not bitul Torah would bowling during the week be permitted if yes can you please explain the difference so I can have a better understanding of the halachos