Until Kerber stopped her, Williams had won four matches in a row for the first time since previous year in the desert.
Belinda had a firing start to immediately break Karolina Pliskova in the 3rd game (2-1) before breaking her gain at the end of the set and win 6-3.
The 18-year-old beat Svitolina 6-3, 2-6, 6-4 in the semi-finals of the Women's Tennis Association Premier Mandatory event at the Indian Wells Tennis Garden.
Thiem earned the only break of the second set in the fourth game, going up 3-1.
Bianca Andreescu could barely believe the result herself
Kerber overcame a 4-2 deficit in the opening set to reach her first career final in Indian Wells.
Canadian wildcard Bianca Andreescu claimed another shock win as she defeated world number six Elina Svitolina to advance to the final of the BNP Paribas Open. Her tennis is very well expressed on hard courts and the German's experience could be the winning weapon in a challenge where mental strength and energy reserves will play a fundamental role. Bruneau said it took three hours to drive from Palm Springs to Irvine and Andreescu needed a 90-minute physiotherapy session that lasted until midnight.
This is not just an unprecedented final, but a new challenge as this is the first meeting between these two players. After each match, with a delightful blend of youthful bravado and humility, Andreescu talked about the role of creative visualization and meditation in her rise, as well as the power of walking onto the court with confidence.
That fighting spirit was on show, particularly in the third set when Andreescu complained to her coach Sylvain Bruneau about the physical toll the match was taking on her before vocalising her determination to get the win.
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"It's incredible, really", Andreescu said of her achievement. She has lost just three times this year and will be ranked No. 24 in the world on Monday.
The Canadian followed in the footsteps of Naomi Osaka, who was a little-known 20-year-old when she won the title last year.
Osaka's success this time last year gave her the confidence to go on and win two grand-slam titles, at the United States and Australian Opens, and the Japanese 21-year-old now sits at the top of the world rankings.
She was a crowd favorite, with fans waving Canadian flags and chanting "Let's go, Bianca!"
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They clearly enjoyed Andreescu's fearless style of play. On her right bicep, she wears a spiral hair tie that she says was bothering her on her wrist so she moved it up.
Andreescu won the next three games, ripping off powerful forehands while winning nine straight points during one stretch, including a 40-love service game. The players then exchanged breaks before Andreescu won two games in a row to go up 5-3. She has so many varied tools in her arsenal - drop shots, slices, volleys, moonballs - that it is bewildering to imagine how she can make the right decision at the right time.
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He completed his treble late on with an exquisite chip after Suarez and Loren Moron had exchanged goals. Victory moved Barcelona 10 points clear of Atleti at the summit with 10 games remaining.