My son's a pretty good 8 year old player, especially groundstrokes. His serve is coming around, however since changing to a continental grip a few months back, he's still inconsistent. Last spring/summer (first exposure to a few tournaments) he served underhand during a few matches. He's doesn't particularly like doing it, but he enjoys playing and it was the only way to avoid double faulting more than half his serves (at the time). As of today, I'd estimate that in a competitive environment (continental grip and pretty decent serve technique) he'd double fault about half his serves. Do you think he should hold off on tournament play until he becomes more consistent? Should underhand serves ever be an option? Thanks.