Correct the mistakes in the sentences.

1. Ken isn't more interested in sport as his brother.
2. The more you practise, the best you'll become at skiing.
3. That was as far the team's best performance this year.
4. Sarah runs the slower of all the players on the team.
5. This gym is twice as bigger as the one I used to go to.
6. The rugby pitch is wet enough; we can't play on it today.