He stunned world number 5 Vietnamese Tien Minh Nguyen twice in the ongoing Indian Badminton league (IBl) but Hyderabad Hotshots men's singles player Ajay Jayaram today said he needs to work on his consistency to reach his target of breaking into the top 15 this year. "I have beaten the world number five twice here and even in the recent past I have beaten a few top 10 players. Definitely, this will boost my confidence quite a lot," Ajay, who is currently ranked 24 in the world, told reporters here. "I have to change the giant killer kind of tag by consistently beating them in the coming tournaments and playing the quarters and semis consistently. That is the positive I take from this tournament. I aim to break into the top 15 by the end of this year.”