It was a case of mixed emotions last night with our outright selection, Rafa Nadal, withdrawing from the event prior to his match with Roger Federer.
Assuming he does take to the court, Nadal will face his great rival for a 39th time, looking to improve his winning record to 24-15.
Nadal confirmed he would also skip the upcoming Miami Masters and aim to recover and prepare for the claycourt season, targeting a return at Monte Carlo April 14-21.
Thiem will also play in Miami, hoping to complete the "Sunshine Double" with a victory there after his Indian Wells win.
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Only two previous wild cards - Serena Williams and Martina Hingis - played their way to a semifinal at Indian Wells. In the third, she overcame a break point to hold at two-all but only won one more game the rest of the way.
Andreescu played fearlessly at the outset, breaking the former world number one in the opening game of the match and taking the first set.
The world No 7, who will return to his career high of four in the Monday's latest rankings, had lost each of the last two Masters finals in Madrid and the writing looked on the wall in the Californian desert when five-time Indian Wells champion Federer claimed the first set.
The Swiss created two break points in the third game but failed to take advantage, while Thiem made sure not to waste his chance in the following game, putting himself 3-1 up and using the confidence to set up a surprise deciding set.
"Still tough because I felt more or less OK during this beginning of the season in terms of my knee", he said.
"I love to play on hard, but probably my body doesn't love it that much", he added. Dominic Thiem recorded unforced errors as nil in the first set. He was beaten in a third-set tiebreaker by Juan Martin del Potro past year.
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Having been forced to retire midway through a match nine times before, including in last year's US Open, Nadal didn't want to go through the same situation again.
Dominic Thiem will take on Roger Federer in the title match, who will be defending his sixth crown in the Californian desert and 101st ATP career title. "With all this stuff, I still where I am today", he said. Sometimes I feel sad because I'm in a disadvantage to all my opponents.
The year began promisingly enough.
Federer, with an extra days rest following Rafael Nadal's semi-final withdrawal, surrendered a one-set lead to lose to Thiem.
Even with all of his injuries, Nadal indicated he has no intention of giving up playing on hard courts, the surface for two of the four Grand Slam events.
Pi Day: Stop & Shop offers pies for $3.14 on Thursday
Cheddar's Scratch Kitchen: Order a homemade chicken pot pie in the restaurant, or one to-go, and receive a second one for free. Every Pi Day , my brother-in-law, a PhD math/physics guru, posts an endearingly nerdy treatise about pi on Facebook.