I actually thought about Ivo before I posted.
He is smarter than most people give him credit for. He gives up most return games to save his strength, energy, and balance for his serve games. He slices and rallies on return games, and only tries if he get's even at duece or 30-30, otherwise just goes thru the motions.
Seems players with serious flaws in their games NEED to be smarter than balanced players.
Let's look at MarionBartoli. She kinda looks like my g/f.
Now let's look at DelPo. He doesn't need to be a genius at tennis strategy, does he?