Generally honest, but if the opponents have been acting like dicks then I'll dick 'em back. Against people like that, you won't earn their respect by being honest, they'll just think you're a schmuck. Finding more and more, cheating cheaters and giving wacko back to wackos, works--they get that and respect you for being one of them--that honor amongst thieves thing.
"...the human emotional system was not designed to endure the mental rigors of a tennis match." Dr. Allen Fox