Master CPU, yes.
Easy CPU, light work. The thing is, don't have the most f**king Coins. If ANY CPU hits the Boo, they will make your life a living hell. If you have 253 Coins, and the others have 43, 78, and 12, the CPU will tax you. Try to hold 2nd Place in terms of Coins as long as possible. The Stars don't matter(unless the taxman is in 2nd Place in terms of Stars).
The Easy CPU is a grinder's paradise.