Sharapova's colorful tweet right on

Maria Sharapova has made her Twitter debut at the Australian Open, and she's tweeting on the trend of this year's tournament.

Maria Sharapova has made her Twitter debut at the Australian Open, and she's tweeting on the trend of this year's tournament.

''Everyone got dressed in the same closet, wearing yellow on court at the aus open,'' she tweeted Tuesday. It was only her second posting, and she already has more than 55,000 followers at @MariaSharapova as of 2:30 p.m. ET Tuesday.

Yellow is hands down the color of choice among players — or rather, sponsors — at this year's Australian Open. Yellow sneakers, yellow shorts, yellow dresses, yellow visors.

For fans in the upper decks, it can be hard to tell who's who on certain courts.

Former No. 1 Caroline Wozniacki wore a white-and-pale yellow tennis dress designed as part of her Adidas line with Stella McCartney.

It was very similar to the white-and-pale yellow Nike dress on her opponent, German Sabine Lisicki. It didn't help that both wore visors over their blond ponytails. Wozniacki won and faces Donna Vekic of Croatia in the second round.

Some men were sporting yellow, too, including France's Gael Monfils whose fluorescent muscle T-shirt matched the tennis balls and was only slightly brighter than the yellow shirt of his 18th-seeded opponent Alexandr Dolgopolov.

''The colors are a joke,'' said 73rd-ranked Timea Babos of Hungary. ''It's the same for everyone — yellow, grey and white.''

She should know. Way out on Court 22, Babos played hard and lost to France's Kristina Mladenovic, 6-3, 4-6, 11-9 in a nearly three-hour battle against a player who looked like her mirror image.

The two wore identical yellow tank dresses with white and gray trim — which provided some comic relief, Babos said, smiling through tears after her loss.

"Having the same outfit was hilarious," she said, adding that it was the talk of the locker room. "Everyone was joking about it. They said, `It doesn't matter, you look better.' "

Sharapova's first-ever tweet was quite sweet, as well: