SHRUDE:Just keep to Legend specific RGs
What Shrude says is the ONLY way you will have a shot (barring the restarts and cheats, which are ABUNDANT here).
I will add that the same players have, for 2 years, dominated the "open" RG's. 1/2 are legit, 1/2 are not (yes I said it, and until I SEE different, I will stick to my opinion).
I will, very seldom, get bored and enter a RG. So far, I'm ahead in entry fees vs. credits won, but the ball usage brings me back down to probably even. Which, in essence, means I just wasted my time.
Remember this too: the payouts cannot be distributed among too many players (hence the same players always winning). That would bring deposits/revenue down. Don't chase that carrot on the end of the stick. It ain't worth it now, and won't be worth it when you're a level 100 TL (or whenever you hit TL).
The "open/any tier" RG's are a sucker bet for anyone that is not listed in the top 20 on that monthly leader board. The RG's should be tier specific. All of them. TL's playing against unsuspecting (or dumb) Pros/Tour Pros/Masters/Tour Masters and most Legends is 100% unfair.