Face by Benjamin Zephaniah (not an adult book but good for teenage lads esp)
Lord of the Flies maybe?
Curious Incident of the Dog in the Night-time
But I wouldn't say it's a bad thing to just read sports biogs at this stage - as long as he's reading. When he does his GCSEs he'll be reading a fair bit of fiction. The fact that he's reading for pleasure will help his reading skills anyway.
Try Holes by Louis Sacher, it's great. Also Bali Rai is popular with teenage boys, all colloquial language and social problems but they like it. 'Dominoes' is short stories so doesn't seem like such a commitment. He might like 'Of Mice and Men' or 'Lord of the Flies' but will almost certainly have to read one of these for GCSE Literature. 'Catcher in the Rye' or 'The Outsiders' are both a bit dated but still draw kids in.
Terry Pratchett - all of them; Ben Elton - if he likes Big Brother start with Dead Famous otherwise Stark; fantasy books - the Magician series are good as is Earthsea. If he won't read them you may enjoy them all!