3-4 point low approach one-space high pincer contact underneath
After these plays Black a is usual, but requires a good ladder. Black b is interesting but gives White plenty of scope. Black c is being played currently.
In this case White 2 seems to have become joseki - there are other known continuations at 4  or the x points. Up to 10 is an established sequence in recent pro play.
If Black wants a wall, Black 1 here tries to keep things simple. It is however possible for White 4 to be played at 5, leading to some dangerous variations. This line can end up with a pushing battle.