'I played a good first set, and I got a bit tired, and my mind began to wander. He served better in the second set. But it was an up-and-down match, and his serve really went away in the end.'

Once he settled into the final set, the California-based Tursunov raced to a 5-0 lead and sealed the contest with a love game against an opponent whose serve deserted him on the day with a massive 16 double-faults.

Israeli Sela, who played a role in his country's Davis Cup upset of Russia little more than a week ago, overwhelmed the 35-year-old Spadea. He next faces US qualifier Alex Bogomolov Jr, a winner against Italy's Flavio Cipolla 6-2, 6-3.

'I may have been fifth or sixth before but never second,' said the 24-year-old Sela. 'When you are ranked 29th, it's not normal to be seeding this high. But I'll take it. I think my game has really been improving a lot recently. I'm just playing more solid.'

Russian Igor Kunitsyn, who played on the losing Russian team against Israel, beat Argentine Brian Dabul 6-4, 6-1, while German fifth seed Benjamin Becker beat Japan's Go Soeda 6-2, 6-3.