Greek sides Olympiacos and Panathinaikos booked their places in the Euroleague Final Four with respective victories over Real Madrid and Montepaschi Siena.

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In the Spanish capital, Olympiacos shrugged off the absence of injured center Nikola Vujcic to down Real Madrid 78-75 and take the best-of-five series 3-1.

Ioannis Bourousis top scored with 25 points to guide the Reds to their first Final Four appearance in 10 years. It was Real Madrid's first home defeat in seven games.

Panathinaikos, the 2007 champions, beat Italian champions Montepaschi Siena 91-84 in Tuscany to seal their passage through, Drew Nicholas pouring in 19 points, including five from seven from beyond the arc.

Mike Batiste (15 points) and Nikola Pekovic (14) also weighed in while a further three Pana players reached double figures.

Only one place for the showpiece event in Berlin remains undecided after Barcelona tied their all-Spanish series with TAU Ceramica at 2-2 thanks to an 84-63 win in Vitoria.

Juan Carlos Navarro returned from injury to help Barca to victory, with five players contributing between 11 and 15 points.