Davis Cup stars key attractions at Bengaluru Open
Ramkumar has paired up with big-serving compatriot Saketh Myneni, while Balaji has teamed up with Germany's Andre Begemann for the event which will run from February 12-18.
Unseeded Yuki battled past his opponent from Bosnia and Herzegovina 7-5, 7-5.
Yuki Bhambri knocked out seventh seed Aldin Setkic in straight sets to move to the singles quarterfinals of the ATP Karshi Challenger but it was all over for his compatriot N Sriram Balaji.
Unseeded Yuki battled past his opponent from Bosnia and Herzegovina 7-5, 7-5 in the second round of the USD 75000 hard court event.
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The Indian saved five of the seven breakpoints he faced and broke his rival four times in the match which lasted one hour and 58 minutes.
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Only Indian left in the far, Yuki next faces top seeded Ukrainian Sergiy Stakhovsky, who faced stiff resistance from Karim-Mohammed Maamoun before prevailing 6-4 7-6(5).
Meanwhile, Balaji lost 3-6 4-6 to Egor Gerasimov from Belarus in his second round contest.
Ramkumar Ramanathan, Vishnu Vardhan and Prajnesh Gunneswaran had all lost in the first round.
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