Lucie Hradecka seems lovely...
Having seen her in several major matches (primarily doubles) in the last year, I'd have to say she's one of the most gracious losers I've ever seen. She's a model in good sportsmanship -- always greets her opponents with a big smile at the net, win or lose. She seems delightful off the court as well. Most of the women could stand to learn a thing or two from her.