Against the Odds (Sweet Valley High #51) by Francine Pascal - Vintage Paperback

Ronnie Edwards is having the time of his life. By betting successfully on high school sports, he's made more money than he knows what to do with. He's even offered Jessica Wakefield a loan. Unfortunately, he hasn't been keeping up with payments to his bookie, Big Al. When Big Al decides to collect, Ronnie's out of cash. So Big Al offers him another option: if Ronnie can fix the state championship soccer game, Big Al will forget about Ronnie's debt.

Ronnie turns to the only friend he has-Elizabeth Wakefield's boyfriend, Jeffrey French, star soccer player for Sweet Valley High. A college scout is coming to see the game, and if Jeffrey doesn't play his best, he'll jeopardize his future. But if he doesn't help Ronnie out, his friend may not have a future.