My top 10
1. "The prince of tennis" - about tennis
Why? If you like OP and intelligent main character, this anime was made for you. There will be moments where echizen surprises everyone with his talent. I've seen a lot of anime but this is my favorite. I have a great fondness for it and even though it has about 200 episodes (because new series have recently been released), I watched it several times. A lot of badass moments which I find amazing.
2. "Haikyuu!" - about voleyaball
Hinata is a short guy(I mean he is not really short but in volleyball people must be tall u know) who dream about being a good palyer like his idol small gigant. He will become pretty strong because of his jump and of course super team which support him the most. I love this anime so much especially because of a lot of great, handsome characters. I like how Karasuno(team) change a lot in good way and become stronger.
3. "Blue lock" - about football
As I said I love OP characters but in this anime the main character is becoming OP with his intelligent. What else I can say. I never read manga before but because I love that anime that much I started and I can't wait for next chapters now.
4. "Kuroko no basket" - about basketball