I personally have not seen Slam Dunk, but I have heard it is pretty good. However, in regards to good/best sports anime, Kaboom, I would say check out Hajime no Ippo and Major. Ippo is about boxing and Major is baseball. Ippo has completed its anime run which includes 76 eps and 2 OAVs. This series ranks in my top 10. Major is on its third season at ep 58 I believe. This is also a great series. I highly recommend both of these if you haven't seen them already or they haven't been commented on. I will eventually get around to seeing Slam Dunk.
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