http://www.mangago.me/read-manga/ookiku_furikabutte/
http://www.mangago.me/read-manga/yowamushi_pedal/
http://www.mangago.me/read-manga/eyeshield_21/
http://www.mangago.me/read-manga/hinomaru_zumou/
http://www.mangago.me/read-manga/diamond_no_ace/
http://www.mangago.me/read-manga/slam_dunk/
http://www.mangago.me/read-manga/angel_voice_koyano_takao/
http://www.mangago.me/read-manga/giant_killing/
http://www.mangago.me/read-manga/prince_of_tennis/
"Ace of Diamond" - My current ongoing fav & the best sports manga I have ever read! The anime is amazing too! But you'll need to have a basic idea about baseball rules & plays or else you won't be able to fully enjoy it.
http://www.mangago.me/read-manga/diamond_no_ace/
Another one you can try is "One Outs" - Another brilliant sports+mind game manga brought to you by Kaitani Shinobu. But some chapters are missing after vol 4 because the anime covers them. The scanlation team picked it up again from where the anime left of. So you'll have to watch the anime for the missing chapters. But it'll be worth the pain if you are a baseball fanatic like me.
http://www.mangago.me/read-manga/one_outs/
Any good sports manga like haikyuu or kuroko no basuke?