cant say how these do on a tennis court since i dont play, but as far as a durable ball for a dog they excelled! i have two Blue heelers, a GSD and a Anatolian Sheppard. The heelers take a ball and i after they wear my arm out throwing it for them off they go in to the wood and that ball wont be seen untill the following year. the GSD is brutal on balls, its like her very life depends on killing the ball, sofar theyse have ween tuff and a lot offun for both of us (she got cartoon eyes when i popped open two cans at the same time and dumpped them on the ground!) the Anatolian normaly would peel the felt off of normal Dog balls then pop them with one bite. would take about 3 or 4 mins to do a ball and at $3 it was getting expensive to keep her occupied. so far she has yet to be able to pull the felt off of one of these and ot of about balls has only popped on with the felt intact that the blue heelers promptly took in to the woods. highly recomended !
Rating: [5 of 5 Stars!]