All 8 seeds advance to Swiss Open quarterfinals

GSTAAD, Switzerland - All eight seeds have reached the Swiss Open quarterfinals, making the clay-court tournament the first on the ATP circuit to achieve that feat in six years.

Sixth-seeded Joao Sousa of Portugal saved three match points to preserve the record on Thursday, going on to beat Denis Istomin of Uzbekistan 6-7 (6), 6-3, 7-6 (4).

The last tournament where the quarterfinals bracket went with seeding was in Montreal in August 2009, according to the ATP.

Top-seeded David Goffin of Belgium needed only 45 minutes to win 6-1, 6-1 against Horacio Zeballos of Argentina.

Third-seeded Dominic Thiem of Austria also beat an Argentine opponent in straight sets, 6-3, 6-4 against Federico Delbonis.

Thiem next faces seventh-seeded Pablo Carreno of Spain, who won 7-6 (3), 6-4 against Robin Haase of the Netherlands.