Stan Wawrinka and Roger Federer will be squaring off for the 23rd time in their careers when they battle for the BNP Paribas Open title on Sunday.
He will face either Roger Federer or American Jack Sock in Sunday's final.
Wawrinka, 31, booked his spot in the final thanks to a 6-3 6-2 triumph over Pablo Carreno Busta on Saturday.
Shortly afterwards, Australian tennis ace Nick Kyrgios withdrew from his highly-anticipated quarter-final showdown against the Swiss tennis ace due to illness.
They stayed on level terms for six games, before Sock faced a break point in the seventh courtesy of a Federer forehand. "It's totally about being healthy, enjoying the tournaments I'm playing and trying to win those".
The temperamental Australian too to twitter barely an hour before the scheduled noon start time at Indian Wells (1900 GMT) in California to make the announcement on Friday morning.
Wawrinka took a much more circuitous route to the semis, twice needing three sets-and third-set tiebreakers-against Yoshihito Nishioka and Dominic Thiem.
"What I don't want to do is overplay and just get exhausted of traveling and exhausted of just playing tournaments and just entering and doing people a favor just to be there with no aspirations".
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"In the second set, I had to rely a lot on my second serve", Federer said.
"I feel happy and fresh. Things got a bit more complicated, but it was definitely a good feeling to get through in two sets and to be back in another finals here".
"I know the danger", Federer said after his semi-final match against Jack Sock.
Having beaten Sock twice past year and not having dropped a set yet in the ongoing tournament, Federer is favourite to reach his seventh final at Indian Wells.
Federer himself even doubted his chances, he said in a recent interview with the Miami Herald. "Especially on his serve, he doesn't give you anything".
Roger Federer has been brilliant this year so far. Although Sock regained his composure and got to deuce on one of Federer's service games in the second set - no one has broken Federer's serve here - the outcome was inevitable. He kept that up by blitzing Sock in the first set Saturday.
Sock, who withstood four match points against Grigor Dimitrov in the third round and had another close shave against Malek Jaziri in the fourth, used his high kick serve and powerful groundstrokes to overcome Nishikori - who hadn't dropped a set in his three prior matches. The Swiss converted his fifth break point of the game to take a break lead in the second set. In the fourth game, a backhand victor, followed by a netted smash and double fault from Sock, handed a love break.