I think Lleyton is currently about 5th in the race so if he does OK at USO and plays the last 2 Masters of the year he should be well and truly safe for the Master Cup. A top 4 finish for the year would be fantastic and he's certainly in with a chance as he is literally defending nothing after USO.
Can't help with the schedule sorry but I am fairly sure he intends to play the remaining Masters at least.
Apparently, he will be No. 8 in the entry rankings on Monday. Agassi leapfrogged over him, which is why he only moved 2 spots. The rankings the Monday after the Olympics and Washington will be used for US Open seedings.