Easy money
When your playing in Rivals mode, save your profile each time you leave the main menu. At times you will get offered a sponsorship when you have done something great, like beating Tiger in one of his challenges. If it happens to be early in the game and EA Sports, Nike, Nike TW Collection, Adidas, or Under Armour do offer you a sponsorship, don't take it. Then, reload your profile, go into Rivals mode again, and do not save the profile. Leave to the main menu again. Most of the time you will be offered a different sponsorship. This is done so that you can get the sponsorships listed above later in the game to have more items to choose from, with bigger payouts. If you take a Precept, TaylorMade, Bridgestone, etc. sponsorship early, you will receive small payouts, but only on a couple of items.

Trophy balls
Finish the listed task to access the matching trophy ball and attribute point bonus.

Aces Wild (3,000 points): Hit a hole-in-one to Ace.
Birdie Buster (3,000 points): Shoot twelve Birdies in one round.
Birdie Streak (3,000 points): Shoot six consecutive Birdies.
First Birdie (500 points): Shoot a Birdie.
First Distance Putt (2 putting points): Sink a 20 foot putt.
First Eagle (1,000 points): Shoot an Eagle.
First Long Drive (2 power points): Hit a 300 yard drive.
First Par (250 Points): Make par on a hole.
First Tournament Win (1,000 points): Win a tournament.
Long Distance Putt (3 putting points): Sink a 50 foot putt.
Low Round (3,500 points): Shoot a sub 60 round
Missing String: 100% game completion
Par 4 Green In 1 (2 long game points): Hit a par 4 green with one shot.
Under Par (2,000 points): Shoot a sub-par round.