Seventh seed Bautista Agut beat world number one Novak Djokovic in Friday's semi-final.
And Friday's win was only the second victory in nine matches against Djokovic for 30-year-old Bautista Agut.
"I will remember this match all my life".
Bautista Agut will rise one place in the world rankings to 23 on the back of the victory in Qatar, and said his aim was to go higher. With the quality of tennis displayed against Novak Djokovic, Roberto will be the favorite going into the finals. That's why Novak is No. 1 in the world.
"I can't be more happy than I am right now".
Speaking on court after the match, Djokovic praised fifth-seeded Basilashvili, who he had anticipated would provide him with a stern test.
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"I wanted to give everything I had in the match and fight until the last point", Bautista Agut added.
Djokovic lost two of his first three service games against Basilashvili and dropped the first set, as he had done in his last-16 win over Marton Fucsovics on Wednesday. "He is one of the greatest legends of all time and we want to see him play".
Not a catastrophe, but certainly cause for concern for team Djokovic as the Serb heads Down Under for the opening Grand Slam of the year, the Australian Open.In Friday's late-evening semifinals at the picture ideal Khalifa International Complex, Djokovic's challenge, which appeared well on course for a setand-a-half, came apart at the wheels as he crashed to a 6-3, 6-7 (6-8), 4-6 loss in 2 hours and 35-minutes.
The Spaniard made the decisive break of serve in the third game of the final set to take a lead he never lost.
Bautista Agut awaits the victor of the match between, another player who has been making a comeback- Tomas Berdych and the Italian Marco Cecchinato.
When Bautista Agut broke back for 4-4, the Serbian was furious and lashed out.