The Indian tennis legend also stressed on the fact that we need good singles players if India want to do well in Davis Cup World Group as the top players take part and have to look beyond only doubles events.
After seven games on serve, Nagal broke Bhambri in the eighth and kept the lead to serve out the set.
Kavcic was tipped to win the quarterfinal tie but Sumit outplayed him in straight sets 6-3 6-4 at the KSLTA Stadium.
Bhambri pipped Spain's Pedro Martinez 6-2 7-6 (0) while Nagal battled past Great Britain's Brydan Klein 6-4 4-6 7-5 in a marathon quarterfinal clash.
Starting the year at 474, Yuki is currently ranked 122 having registered a win over Gael Monfils and pushed Denis Shapovalov and Kevin Anderson to deciding sets in the Davis Cup and Citi Open respectively.
Yuki, country's top singles player, overcame Ramanathan 4-6 6-3 6-4 in a little over two hours at Balewadi Sports Complex.
Yuki beat second seed Spaniard Adrian Menendez-Maceiras 6-2, 6-4 in the first semifinals that lasted one hour and 39 minutes.
India's singles challenge ended at the Vietnam Open following the defeat of Yuki Bhambri.
Prajnesh will lock horns with top American Taylor Fritz, who knocked out India's Vijay Sundar Prashanth.
Bhambri might not have won the match against supremely talented Shapovalov but pushed the 18-year-old Canadian to five sets before losing the second singles tie in the Davis Cup.
Left-handed Sharan and his American partner Scott Lipsky outplayed the local wild card pair of Jui-Chen Hung and Cheng-Yu Yu 6-1 6-4 in just 50 minutes.
With the outcome already decided, Yuki Bhambri won the dead fifth rubber against Canada's Brayden Schnur 6-4 4-6 6-4 as India lost the World Group Play-off tie 2-3 to the hosts.
Yuki proved that his recent win over world number 22 Gael Monfils was no fluke and he gave a good fight to the world's top players.
India have their hopes hung on the shoulders of Yuki and Ramkumar, who too created a splash by knocking down Gael Monfils and tennis' latest hot property Dominic Thiem.
Ramkumar, now India's number one singles player at 156, faces seasoned Frenchman Paul-Henri Mathieu, who is now placed 213 in the ATP ranking chart.
Both Bhambri, who recently beat world number 22 Gael Monfils, and Saketh Myneni had missed the Uzbekistan tie due to their respective injuries.
The Indian qualifier, who savoured his best ever performance on the ATP World Tour, went down fighting 4-6 6-4 3-6 against the world number 45 from South Africa in the quarterfinals played last night.
Yuki Bhambri, ranked 200th in world rankings, recovered from a set down and registered what turned to be an emphatic 6-7, 6-3, 6-1 win over Guido Pella.
Bhambri will next face Argentina's Guido Pella in the round of 16 of ATP Citi Open.
The 22-year-old from Chennai is now India's best-ranked player in the singles.
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