New Delhi (PTI): Indian Davis Cupper Prakash Amritraj continued his sizzling form to storm into the quarterfinals of the USD 75000 ATP Challenger tournament in Aptos, United States after posting a convincing straight sets win.

Prakash, who had knocked out top seed Amer Delic in the first round, beat American wild card Phillip Simmonds 6-4, 6-2 in the second round.

However, Prakash and his American partner Lestor Cook bowed out of the doubles event after losing their quarterfinal tie.

The Indo-Amrican pair lost 7-6 (3), 4-6, 4-10 to Israeli pair of Noam Okun and Amir Weintraub in a grueling contest.

Meanwhile, the Indian pair of national champion Ashutosh Singh and Davis Cupper Harsh Mankad advanced to the semifinals of the Euro 30,000 ATP Challenger tournament in Manchester after demolishing their opponents in straight sets.

The fourth seeded Indian pair outplayed Czech pair of Pavel Snobal and Jan Vacek 6-1, 6-1 in the quarterfinals.

However, Indian challenge had ended in the singles event after the first round defeats of Mankad and Purav Raja.