Kukushkin ousted in Oeiras

Oeiras, Portugal ( - Eighth seeded Mikhail Kukushkin was a first-round upset victim Monday at the $590,000 Portugal Open, a clay court French Open tune-up.

Rising Spaniard Pablo Carreno Busta vanquished the Kazakhstanian Kukushkin in 6-1, 7-6 (7-3) fashion.

Also on Day 1, Kazakhstan's Andrey Golubev snuck past Frenchman Adrian Mannarino 6-3, 3-6, 6-4.

This week's top seeds are Czech star Tomas Berdych and Canadian slugger Milos Raonic.

Swiss Stan Wawrinka, who is not defending his title this week, upset Spaniard David Ferrer in last year's finale here.

The 2014 Oeiras champion will collect $107,000.