If you applied some common sense you could easily arrive to a correct deduction. Momo obviously knew only Naruto and Sasuke were left and with Naruto in a disadvantageous position, Sasuke would attack then. In other words he knew exactly when Sasuke would attack due to Naruto.
If Sasuke fought him first instead of Naruto, well, we already seen him outplay him multiple times later in the fight.
Judging by that lame profile pic of yours i would say your were offended. All i hear is wining from fanboy who clearly has less common sense than what he's preaching about and just can't stand the fact that his fav was momentarily getting showed up,and now he's taking it to heart. If you actually exercised your ability to pay attention you might just stumble upon the slightest clue that what you're saying sounds straight ignorant,so what you're saying is sasuke intentionally took the bait, rushed in, and put himself in a position that possibly would've got him killed? What sense does that make when both naruto and him were fully aware that neither one of them stood a chance alone(well naruto with a little better of a chance),Why would sasuke WANT TO decrease their chances of winning? Here's a better question, why didn't sasuke just simply use a long range attack,or amateratsu alone with follow attack to save naruto? At least then then risk would be kinda eliminated due to distraction purposes,even if it wouldn't had did much to momo it would've been a hell of a lot better idea than the way he initially went about doing it... Wouldn't that had been a better idea? You don't know much about smart tactic's do you?
I assume you're here to defend sasuke..If that's the case you're already doing it wrong lol,because if you used your head a little bit you would've realize that your argument not only makes no sense,but it actually makes sasuke out to seem like a amateur who makes dumbass decisions XD. That's what happens when you put to much effort into defending a character
