But the favourite was comprehensively beaten in four sets by his fellow Spaniard Albert Costa.

BBC: Juan Carlos Ferrero

If Moya beats Albert Costa on Friday, Hewitt will join him in the last four.

BBC: Hewitt sends Safin spinning out

Czech Jiri Vanek downed former French Open winner Albert Costa, seeded eighth, 7-6 (7-4) 6-3.

BBC: Nadal maintains form

Philippoussis will now face Sjeng Schalken of the Netherlands, who beat 14th-seeded Spaniard Albert Costa.

BBC: Sampras beats 'desert demons'

Argentine Agustin Calleri (16) earlier defeated last year's finalist and French Open champion Albert Costa 6-4 6-2.

BBC: Agassi downs Labadze

The pair became the latest big-name casualties in Stuttgart after fellow seeds Albert Costa and Felix Mantilla lost on Tuesday.

BBC: Seeds fall in Germany

But Spanish teenager Rafael Nadal , who defeated French Open champion Albert Costa at the Monte Carlo Masters last week, made progress.

BBC: Agassi powers through