oh god. i know what you mean. actually i can catch up fairly quick if i read in one-go but then when it's... waiting for manga updates i just get distracted and stop reading at some point x__x
prince of tennis was one of my first animes back a long time ago so i'm pretty fond of it. never heard of eyeshield 21 though 0:

ick, i don't know. i'm like.. hardcore nsfw stuff? sure, whatever. disgusting gore? im cool. incest? i'm literally spiraling backwards into the atmosphere as far away from this as possible.