Ответ:

1. win hands down

2. throwing in the towel

3. in the league of their own

4. in the long run

5. get the ball rolling

6. out of left field

7. play by the rules

8. ball is in your court

9. hitting below the belt

10. are skating on thin ice

11. learns the ropes

12. no sweat

13. call the shots

14. to back the wrong horse

15. in full swing