Kolkata: India's Ramkumar Ramanathan disappointed the audience as he went down fighting to Chinese Taipei's Ti Chen at the Kolkata Open, being held on the hard courts of the Bengal Tennis Association Complex here Thursday. Chen entered the men's singles semis with a 6-4, 3-6, 7-6(5) victory.

In the sixth game of the opening set, Ramkumar got lucky as he bagged the break of serve, going up by 4-2. But he followed it with a poor service game and a double fault to lose the lead with Chen equalising at 4-4.