Prakash Amritraj advanced to the quarterfinal of the $50,000 ATP Challenger event in Calabasas in United States after getting a walkover from his third seed opponent Jesse Levine but his doubles campaign ended with a defeat in the last eight round.
A wild card entrant in the singles, Prakash's first round rival - Llija Bozoljac - had also opted out of the contest mid-way, due to a back problem.
In the singles quarterfinals, Prakash will now lock horns with American Mlchae Yani, who carved out a hard fought 7-6 (6) 6-7(4) 7-6 (5) win over fellow American and wild card Bradley Klahn in the second round.
In the doubles, fourth seed Prakash and Alex Kuznetsov lost 2-6 3-6 to South African pair of Raven Klaasen and Izak van der Merwe.
