The U.S. Open 2012 tournament enters it's 6th day Saturday with 3rd round matches for men and women's singles and 2nd round matches for men and women's doubles.

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No. 4 seeded Serena Williams will play against Russia's Ekaterina Makarova at 1 p.m. today at the Arthur Ashe Stadium. Also Switzerland's Roger Federer (No. 1 seeded) will play against Fernando Verdasco from Spain around the same time.

No. 3 seeded Andy Murray from U.K. will play against Spain's Feliciano Lopez at around 1 p.m. today at the Louis Armstrong Stadium and No. 2 seeded Agnieszka Radwanska from Poland is currently playing against No. 30 seeded Jelene Jankovic.

Four-times grand slam champion Kim Clijsters was eliminated from the single rounds by Laura Robson but she continues playing in mixed doubles with Bob Bryan. They will play against Ekaterina Makarova and Bruno Soares today on the second round.

SEE FULL SCHEDULE For the US OPEN 2012 DAY 6 - SATURDAY SEPTEMBER 1

Another anticipated match is between Ana Ivanovic vs Sloane Stephens. Ivanovic will seek her first U.S. Open title and second Grand Slam title.

The tournament has already sparked several upsets. Perhaps the biggest buzz so far was British player Laura Robson's triumph over China's Li Na 6-4, 6-7, 6-2 on Friday. Li is the former French Open champion.

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