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Maharashtra's Pooja Ingale has also made it to the doubles semifinals.
A few upsets were also witnessed on the third day of the main draw.
The top seed is on course to play the pre-quarterfinals on Wednesday.
Djokovic defeated the young Spaniard 4-6 6-4 6-3 6-4 in a gladiatorial battle.
Thapa defeated fellow-Keralite Arjun U 6/4, 6/1 in his third qualifying match to advance.
Fans are expected to pack Rod Laver Arena when 10-time champion Novak Djokovic meets Carlos Alcaraz.
Kerala's Karan Thapa has inched closer to qualification.
The main draw of the week-long event will begin on Monday.
The top billing for the men's and women's categories are J Vishnu Vardhan from Telangana and Pooja Ingale from Maharashtra.
Novak Djokovic to play US wildcard Nishesh Basavareddy as the main round starts on Sunday.
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