Andy Roddick defeated Denis Istomin 6-4 7-5 on Thursday to reach the quarter-finals of the Delray Beach ATP tournament, avenging his loss to the Uzbek a fortnight earlier.

Roddick, the fourth seed, converted all three of his break chances to book his second quarter-final appearance of the season.

Istomin had beaten Roddick in the quarters en route to the final at San Jose in California in February, before falling to Canadian Milos Raonic in the title match.

Roddick, 29, next faces seventh-seeded South African Kevin Anderson who took his 2012 record to 7-4 with a 6-3 3-6 6-3 victory over two-time former Delray Beach champion Xavier Malisse of Belgium.

Fifth-seeded German Philipp Kohlschreiber reached the quarter-finals with a 6-2 6-2 win over Croatian Ivan Dodig.

Kohlschreiber broke Dodig twice in each set to lock up the victory in 78 minutes.

Kohlschreiber will be trying to reach his third semi-final of the season, after making the final four in Auckland and Montpellier.

He’ll face Israel’s Dudi Sela, who reached his second quarter-final of the season with a 6-4 6-4 defeat of Finland’s Jarkko Nieminen.

Sela converted three of 14 break point chances against Nieminen, who won the Sydney International as a qualifier in January.

Friday’s other two quarter-final match-ups were decided on Wednesday, with top-seeded American John Isner advancing to a meeting with eighth-seeded Australian Bernard Tomic and former champion Ernests Gulbis of Latvia booking a showdown with Australian qualifier Marinko Matosevic.