I tried St. Andrews #9 a million times without success before I decided to try something else. I found hole #4 at TPC Boston to be the better choice, as you can use a 3 iron instead, thereby increasing your accuracy.
With the Max Stats suit on, I had the flag at almost exactly 100% with my 3 iron, sunny weather, calm wind and medium pin difficulty (easy pin is way harder on this particular hole). Got it on the fifth try. The shot was at 100% with the wind blowing towards the hole at 1 mph.
To sum it up:
18 holes, TPC Boston #4 only
Sunny weather, calm wind, medium pin difficulty
Use the 3 iron and wear a Max Stats suit. I strongly recommend spending the MS Points to unlock this early on to avoid all the training sessions after each round.
Good luck :)