Prakash Amritraj and his American partner Kevin Kim made a first round exit from doubles event of the ATP Challenger tournament in Knoxville in the US after losing in straight sets to Davey Sandgren and John-Patrick Smith.The unseeded Indo-American pair lost 2-6 3-6 to American-Australian wild card entrants in their opening match of the 50,000 dollar hard court event.Prakash will now hope to do well in the singles event as he faces South African Davis Cupper Izak van der Merwe in the first round tomorrow.Somdev Devvarman is seeded sixth and will clash against Roko Karanusic of Croatia in his opening clash. For the doubles event, Somdev has paired with compatriot Purav Raja.