It's tough as hell, isn't it? Make sure your difficulty is on low if you're having trouble, and if you're still having trouble, may God help you...

I got a Flawless Victory on him.
I found a VERY cheesy way to whip his ass and barely have him fight back.
First, I ended up with Dairou, a stroke of pure luck. Second, I started the fight by sidestepping a combo and pulling out his weapon. Third, I repeatedly used a cheesedick combo that he almost never blocks the final hit of to beat him down.
I think it's 3, Back +3. It's the last one listed in the weapon stance list under the moves list menu.
Seriously, knock his ass down with it, then get over to him right away. As he gets up, he almost always swings immediately, so quickly sidestep and pull the combo again. If he ever blocks it, which he rarely did for me, just sidestep immediately and try again.
I shit you not: Dairou Wins! Flawless Victory!

That fight sure sucks ass, even more so because I got Kira 15 damn times in a row before finally getting to play as Scorpion. I just used button 2 in his Moi Foi stance (he punches with both arms) , it pushes him back and he almost never blocks it. If he starts rushing you pretty hard then just retreat a little, spear him, and repeat.
Hope this helps.

yeah... i had a hard time with that one as well... for me i was raiden.. and kept teleporting.. and grabing him.. sometimes when he went down i did the electricity grab..

After about 25 tries and almost breaking my wireless logitech controller I finally beat him using Liu Kangs Nunchakus*sp?* . I Used the 1,1,1 combo and didn't let off, every now and then i'd use the B+1 attack to knock him on his ass and throw off his constant blocking. Just block and side step alot and don't let off of him. It's a pain in the ass fight no matter how you look at it, you just have to wait til that one round when you get lucky.
btw, has anyone beat the Shang Tsung Battle in the Netherealm yet(you bleed and he regenerates)? I haven't tried it again since i beat scorpion, i was wondering if you get a key for winning or just more useless koins in which case i won't even bother.

here's another easy way that works against every1 in conquest mode. maybe arcade mode 2. anyway
play as mileena . forward , forward, circle ( sorry, i don;t know what it is for XBOX). anyway she should do a drop kick. do that over and over. do a backflip every once in a while. sometimes they move.

**spoiler**
OMFG!!!!.....the stupid thing is stuck in my head!!!!.....i keep hearing "scorpion wins".....but im fighting him as old shujinko (which sucks)......once u get the last komigijo he attacks u.....its sooooo anoying......but ill beat it sooner or later is there any way to switch from old shujinko to like subzero or something??

im fighting as Kabal, Kabal fucking sucks ass.... give me Ermac damnit!