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World No. 12 Sindhu and Marin, currently ranked sixth, had earlier talked about camaraderie between them but they showed none of it on the court on Saturday.
The two-time Olympic medallist displayed her immaculate retrieving skills and exemplary net play to outshine Katethong.
The five-time European and three-time world champion said she has torn her anterior cruciate ligament and both meniscus in her left knee.
Carolina Marin and world No. 1 Kento Momota will be the top seeds in the Super 500 event to be held in New Delhi from May 11 to 16.
The Spanish shuttler won 21-12, 21-5 in a lopsided match.
Former champion Kidambi Srikanth, however, couldn't cross the semifinal stage as he went down 13-21, 19-21 to top seed and former world champion Viktor Axelsen.
Marin beat India's P V Sindhu in final round of latest World Badminton Championship.
The unexpected one was rising doubles star Satwiksairaj Rankireddy who was the highest paid non-Icon Indian player with Rs 52 lakh.
With this win, Kento Momota became the first Japanese player to win the men's singles crown.
Spain’s Carolina Marin beat China’s Chen Yufei 21-18, 21-13 in 47 minutes to take the women’s singles title.
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