This is how I got past 5* Attack in Challenge Training:
Try drawing the defender away from his team mates, slowing down with an autoside step (R2+pull sideways to direction of run, then release direction) heading towards the touchline, then as the defender starts to go in for the tackle, hit L1 for closer control and cut inside him at an angle where an R1 sprint (or even R1+R2) gives you a chance to just drive past the second defender.
Often his team mate will still get to you, but if he doesn't, you have to let go of R1 and slot home a decent shot, even add a shot-feint (hold [], then cancel the shot with O to produce the feint, and then tap [] for the tap in).
The other way I've found to beat players 1-on-1 is to auto-sidestep one way, then do a proper side-step back the other, it's tricky but if you can get it going in diagonal directions it works best. Try using L1 as you switch directions to keep the ball close so that if you haven't beaten the defender, you can still turn away from the tackle.
It's very tricky, but once you can control switching from side-steping in one direction, straight into another - you can screen the ball while the defender closes you down, and then cut straigh back inside him as soon as he's commited to the tackle. At it's best I can almost do 3-point turns - showing defenders one way, turning to shield the ball, then bursting away in the other direction. On other days, if I'm not concentrating or trying to force the game, I'll lose the ball and fall over, while the opposition all break into attack.
I only started looking at the 8 possible angles for side-stepping when it was pointed out here that by comparison, the R1 sprint has 16 angles. Knowing these angles helps you judge if you can maintain a full R1 sprint by just shifting the angle of your run by 22.5 degree's, or if you'll have to slow down, draw him and then outwit him by using L1 and/or R2 on the 8 diagonal angles.