Spain's Fernando Verdasco, who won the U.S. Men's Clay Court Championship over the weekend in Houston, has pulled out of the Monte Carlo Masters due to an injury.

The 30-year-old Verdasco, who is ranked No. 26 in the world, was replaced in the draw by Australia's Marinko Matosevic.

Spanish world No. 1 Rafael Nadal will make his debut at the tournament on Wednesday, taking on Russia's Teymuraz Gabashvili.

The 28-year-old Gabashvili, the world No. 58, defeated France's Gilles Simon 4-6, 6-4, 6-4 on Tuesday.

The world's top six players - eight-time winner Nadal, Serbian defending champion Novak Djokovic, Switzerland's Stanislas Wawrinka and Roger Federer, the Czech Republic's Tomas Berdych and Spain's David Ferrer - will all be in action in Monte Carlo, the year's first clay-court Masters 1000 event.

Nadal has a 3-0 career record against Gabashvili, defeating him in Miami in 2009, on clay at the French Open the same year and at the U.S. Open in 2010.

The 27-year-old Nadal, a 13-time Grand Slam champion who has won a record eight French Open titles, has never dropped a set against Gabashvili.

The ATP World Tour Masters 1000 tournaments rank behind only the four Grand Slam events and the season-ending Barclays ATP World Tour Finals in terms of ranking points and prestige. EFE