I'm not a wrestler but I will give you my advice anyway, or at least that which I understand about single legs -
First off all these counters to single legs - uchi mata, blocking behind with a hand, etc., there's no "specific" thing you need to do against them. You just have to keep good head position, and stay on the attack.
To counter his defense (or to get head position) there's like 3 things you can do, either you spin to your right ( run the pipe), you spin behind him, or you run through him.
You have to tie all these finishes together - you get to your feet, he's sprawling on you hard, you try to circle behind him to get the pressure off so you can get the leg up high, he keeps sprawling and he's squaring up with you - the far leg is going to the inside -> here it will be much easier to try and go for the flare double, since his leg is going to you, but say he defends it again and moves the far leg far back so you can't pull it probably -> you have perfect position for running the pipe, because his other leg is so far away.
It matters if he's just sprawling on you, or if he's pushing away from you too if you are strong enough to finish with stuff like the flare double... etc, but my point is you just have to stay aggressive with good position.
Things like uchi mata as a counter to single leg happen when you have poor position, your head is down, he's wizzering you hard, breaking your grip on the leg, his leg is on the outside... if you can't get good position, then there's nothing you can do besides expecting him to do it and then reacting by just dropping your hips low.
Skey91
What are some good finishes against stronger guys, once they get the leg on the outside and are sprawling on you pretty hard, but you manage to stand up? What I usually see is people justing taking the leg high into the armpit, but when his leg is on the outside and he has good position, it's really hard to get it up, and even if I get it there, it's not that easy to finish. So usually I try to make an angle, and step over the leg - but I'm not sure about one thing there - should I hook the leg (then he definitely won't be able to get it back to the outside), or should I just pinch it with my knees - I feel a bit uncomfortable with it pinched, I feel sort of weak without the possibility to really control him.
I often try to do a navy finish (hooking from the outside though), because it works good against guys my size, but if I try it against a big guy, I'm afraid that he'll sprawl, drop on his knees, and I won't be able to keep standing, because I just tried to run through him with. Do you also think it's not a very good finish against big guys?