Kavcic was tipped to win the quarterfinal tie but Sumit outplayed him in straight sets 6-3 6-4 at the KSLTA Stadium here.
In the semifinals, Sumit will face Yuki who defeated compatriot Prajnesh Gunneswaran 7-5, 6-2 in another quarterfinal match of the USD 100,000 tournament.
Asked about tomorrow's semifinals, Yuki said, "It does not really matter whom I am playing in the semifinals. I will just focus on my game."
Yuki had beaten Spain's Pedro Martinez 6-2, 7-6 yesterday to enter the quarterfinals.