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It may not fill that NijiKoshien shaped hole in your heart, but hopefully something can give you a thrill in here. Here's a list of top tier sports
manga for your pleasure (anime adaptations exist for some of these but I can't attest to their quality)
BASEBALL:
Major
Daiya no Ace & Daiya no Ace Act 2
One Outs
Rookies
Ookiku Furikabutte
Touch
H2
Cross Game
Bungo
Last Inning
Yugami-kun ni wa Tomodachi ga Inai
Battle Studies
Gurazeni
Mr. Fullswing
Yakyuu de Sensou suru Isekai de Choukoukoukyuu Ace ga Jakushou Kokka o Sukuu Youdesu
BASKETBALL:
Slam Dunk
Kuroko no Basuke
Real
Ahiru no Sora
SOCCER:
Blue Lock
Ao Ashi
Giant Killing
Captain Tsubasa
1/11
Days
Inazuma Eleven
AMERICAN FOOTBALL:
Eyeshield21
TENNIS:
Aim for the Ace!
Baby Steps
VOLLEYBALL:
Haikyuu
Attack No. 1
CYCLING:
Yowamushi Pedal
MOTORCYCLING:
Baribari Densetsu
Bakuon
BOXING:
Ashita no Joe
Hajime no Ippo
Katsu!
MOUTAIN CLIMBING:
Kokou no Hito
Kamigami no Itadaki
PING PONG:
Ping Pong
GAMBLING:
Kaiji
Usogui
Akagi
Gin to Kin
Ten
Tobaku Haouden Rei
Legend of Gambler: Tetsuya
MARTIAL ARTS:
Kenji
Shamo
History Strongest Disciple Kenichi
Baki
Kengan Asura
All-Rounder Meguru
Tough
Bamboo Blade
Osu!! Karate-Bu
Karate Shoukoushi Kohinata Minoru
Teppuu
GO:
Hikaru no Go
RACING:
Initial D
Capeta
Over Rev!
BADMINTON:
Hanebado
HYAKUNIN ISSHU:
Chiyahafuru
SHOGI:
3-Gatsu no Lion
HOCKEY:
Go Ahead
Supinamarada
Hot
GOLF:
King Golf
Feel free to recommend more but these are all the ones I've read that I really enjoyed plus ones I added on recommendation
