"I don't care what's happening on court, I just try to execute my game", Williams said.
Meanwhile the Russian, perhaps worn out, could not produce the sterling play that led to her giant-killing win over American Venus Williams in the semi-finals. "I don't find excuses".
"I'm really grateful about that and I'm also really happy that they were cheering for me", she said.
Osaka's gamestyle is based on her big serve and groundstrokes, which can be spectacular to watch, but also wild at the same time.
Ranked 44th, the Japan-born Osaka opened the tournament by beating Maria Sharapova in the first round. She defeated No 31 Agnieszka Radwanska and No 5 Karolina Pliskova on her way to the final, dropping just one set in six matches.
Unseeded Naomi Osaka has won her first WTA title and simultaneously, she logged the record as the first Japanese player to win the Indian Wells final, routing Russian Daria Kasatkina 6-3, 6-2 on Sunday. At this point of her career, her goals are bigger than Indian Wells, but this was not the look of a confident, self-assured champion. "That's pretty much all - I mean, I have to stop making that many errors against her".
"It feels a little bit lonely, because there's, like, nobody here", Osaka told the media in Indian Wells.
Fast forward one year, and the last two women standing, who would contest one of the most prestigious titles in women's tennis, were both 20 years old, and part of the youngest final since 2001 when a 19-year-old Serena Williams would beat the 17-year-old Kim Clijsters.
The Russian has posted victories over each of the four reigning Grand Slam champions within the past seven months, and her route to the Indian Wells title match has seen her defeat four consecutive top-20 players and Major winners.
The 32nd seed overcame 18th seeded home player Sam Querrey 7-5, 2-6, 6-3.
Williams hit a wayward forehand on the first point and then dumped a forehand into the net on the next point, which caused her to slam her racket in frustration.
The Williams-Kasatkina semi is a rematch of their rain-delayed third-round meeting at Wimbledon in 2016.
Halep won the final five games of the third set after being broken once and falling behind 3-1 early. Commenting the match on ESPN, the 18-time Major victor said: 'No.
"Anyone who gets used to losses should give up on life", Williams said.
Osaka pounced on Kasatkina from the beginning of the second set, starting with an opening break of serve.
September 2, 2017: Beats No. 12 Jelena Ostapenko in the round of 32 at the US Open. Osaka gained the only other break of the first set with a backhand victor on the sideline to go up 5-3.
With her fourth-round finish at the US Open a year ago, she would begin a run of wins over all four reigning Major champions-French Open victor Jelena Ostapenko, Wimbledon champ Garbine Muguruza, US victor Sloane Stephens, and Australian champion Caroline Wozniacki, plus current No1 Halep.