Here are some entertaining videos featuring Elena Dementieva, Venus Williams and Caroline Wozniacki. The videos are part of the Sony Ericsson WTA Tour’s "Hero Challenge" Campaign.

I bet you want to serve like Elena Dementieva. No, it’s not a joke. Look at this accuracy!

Although I know you have never doubted Venus Williams’ powerful serve – take a look at how she destroys big American football players.

And check out Caroline Wozniacki playing against a pair of men, showing great speed and anticipation.

World number nine Caroline Wozniacki won her fifth career WTA singles title by beating Virginie Razzano 7-6(5) 7-5 in the final of the AEGON International.

In the first set there was one break of serve on each side and then in the tiebreak the sixth seed Wozniacki won the set. The Dane won the see-saw second set too, converting her third match point on Razzano's failed drop shot.

The world No.25 Razzano still hasn’t managed to win a set against Wozniacki, but in the trophy ceremony both players were positive and happy.

"I think I have a done great job this week," said Razzano. "It was tough every day but I’m happy to go into the final today and I would like to give congratulation to Caroline. She played well this week, she is a great player." (via AEGON International)

Stella McCartney’s patience deserves every respect, but even her waiting for Maria Kirilenko to actually showcase some of her outfits seems to have ended since Caroline Wozniacki has been chosen as a new promoter of adidas by Stella McCartney.

Maria Kirilenko has been constantly losing early in tournaments and tennis fans barely got the chance to see beautiful adidas by Stella McCartney designs. I’m sure the 18-year-old Dane will be a much better promoter of the brand, although Kirilenko and adidas by Stella McCartney were a match made in heaven considering how the clothes suited the Russian.

Caroline Wozniacki will be the only player to wear adidas by Stella McCartney at the 2009 US Open. (source: The Double Bagel, photos: Ralf Reinecke)

Second seed Serena Williams avoided the fate of her sister Venus, and recovered from being a set down to beat Maria Jose Martinez Sanchez of Spain 4-6 6-3 6-4 and move into the fourth round of the French Open.

The match was accompanied by one incident in the first set, because of which Williams called her opponent a cheat. Martinez Sanchez broke to lead 3-2, although the crucial point-winning shot appeared to rebound off her arm.

"The ball did touch her 100 percent on her arm. The rules of tennis are when the ball hits your body, then it's out of play […] She should have lost the point instead of cheating," said the ten-time Grand Slam champion Williams.

However, Martinez Sanchez insisted she was innocent.

"I put the racquet up. The ball was in and it was a point for me. It didn't hit me or my body. To say I'm a 'cheat' is stupid. I'm not going to comment on it."

Tenth seed Caroline Wozniacki lost to world No.41 Sorana Cirstea of Romania 7-6(3) 7-5. Wozniacki, who has recently become the first Danish WTA player to crack the Top 10, needed a medical time-out for a back problem when just two points from defeat.

Other notable third-round results of the day: Samantha Stosur upset Elena Dementieva, Svetlana Kuznetsova dispatched Melinda Czink 6-1 6-3, Jelena Jankovic stormed into the fourth round with a 6-1 6-1 crushing of Jarmila Groth, Victoria Azarenka defeated Carla Suarez Navarro 5-7 7-5 6-2, and Agnieszka Radwanska beat Kateryna Bondarenko 6-2 6-4. (source: AFP, photo: Stephane Martinache)

World No.1 Dinara Safina solidified her position at the top of the Sony Ericsson WTA Tour rankings, as well as her role of the favorite for winning upcoming Roland Garros, with a 6-2 6-4 victory over ninth seed Caroline Wozniacki in the Madrid Open final.

The top-seeded Safina broke the 19-year-old Wozniacki’s serve three times in the first set and early in the second to storm to her 11 career title and second successive title after winning in Rome last week.

The 23-year-old Russian will head to the French Open, where she was a runner-up to Ana Ivanovic last year, on a 10-match winning streak.

Safina has earned €620,000 by winning the Premier-level claycourt event in Madrid, while Wozniacki, who will from tomorrow be ranked 10th in the world, took home €310,000. (photo Getty Images via Yahoo)

Top seed Dinara Safina and ninth seed Caroline Wozniacki will meet in the Mutua Madrilena Madrid Open final to play each other for the first time.

The world No.1 Safina defeated Patty Schnyder 6-4 6-2 in Madrid semifinals. Schnyder had defeated two Top 10 opponents in Madrid, No.10 Nadia Petrova in the third round and No.4 Jelena Jankovic in the quarterfinals, but she fell to Safina, who has moved into her third straight final, and will be going for her second straight title.

This week in Madrid, Safina has reached her 12th final in 20 tournaments. Also, since ascending to the top of the rankings, the Russian has posted a 13-1 record.

In the first semifinal of the day, Caroline Wozniacki beat Amelie Mauresmo 7-6(1) 6-3.

The 19-year old Wozniacki, who has since May 2008 played more matches at Tour level events (including Fed Cup) than any other player, will become the first Danish WTA player to reach the Top 10. She can even climb to No.9 if she defeats Safina in the final. Safina will stay No.1 nevertheless. (photos: Ralf Reinecke, Tennis Channel)

Former world number one Amelie Mauresmo and soon-to-become a Top 10 member Caroline Wozniacki will meet in the semifinals of the Mutua Madrilena Madrid Open.

Mauresmo advanced to the final four after fighting back from a set down to beat Agnes Szavay 5-7 6-1 6-1. In the third set, Mauresmo broke Szavay’s serve in the first, third and seventh game.

Earlier on Friday, ninth seed Caroline Wozniacki, who will become the first Danish woman to crack the Top 10, defeated Vera Dushevina 6-0 6-4.

Mauresmo and Wozniacki have never clashed so far, so we’ll watch their first career meeting.

In the other semifinal, world No.1 Dinara Safina, who beat Alona Bondarenko 6-4 6-3, will face the winner of the quarterfinal between fourth seed Jelena Jankovic and Patty Schnyder. (photo: Ralf Reinecke)

World No.3 Elena Dementieva and No.11 Caroline Wozniacki marked the start of the new tournament called the Mutua Madrilena Madrid Open by playing "Underground Tennis", the latest promo invention of Sony Ericsson.

Dementieva and Wozniacki played tennis on a specially built court placed on the unused track of the Chamartin Metro station, while commuters were passing by.

Here’s the video clip from the event.

Previously, Sony Ericsson promoted tennis with matches at other unlikely places like the terrace of Villa Miani in Rome, on top of cars, on water, and on a desert island.

Second seed Caroline Wozniacki of Denmark defeated Canada's Aleksandra Wozniak 6-1 6-2 to win The MPS Group Championships and her fourth Sony Ericsson WTA Tour career title, but the first one on clay.

Wozniacki and Wozniak both had difficult way to the final. Wozniak, the fifth seed, saved a match point in the quarterfinals against Tamira Paszek, while Wozniacki survived an even bigger scare, saving four match points against Elena Vesnina in the semifinals.

Despite losing, Wozniak had a fantastic week, reaching her third Tour final and beating the world No.10 and top seed Nadia Petrova in the semis.

Wozniacki took home $37,000 of the tournament's $220,000 purse.

Eighth seed Svetlana Kuznetsova was the first to enter the semifinals of the Sony Ericsson Open by overcoming Danish 13th seed Caroline Wozniacki 6-4 6-7(5) 6-1.

The 2006 Miami titlist defeated Wozniacki in 2 hours 54 minutes and will next play the winner of the Victoria Azarenka vs. Samantha Stosur quarterfinal, set to take place later on Tuesday.

Other quarterfinalists will take the courts on Wednesday. They include Serena Williams against Li Na and Venus Williams against Iveta Benesova. (photo by our reader Jacob)