U.S. Magazine Confirms Roddick, Sharapova an Item

A source for the magazine said the couple recently went public with their relationship at the Zinc Lounge in Manhattan Beach, where they were "beside each other all night."

The magazine also quotes a friend of Roddick's, saying the couple have kept the relationship on the down-low because of Sharapova's age, with the Russian former Wimbledon champ turning 19 this past April. Roddick is 23 years old.

Rumors swirled last month when Roddick was seen having lunch with ex-girlfriend Mandy Moore.

At last year's ESPY awards in July, according to ESPN, "After the party, the two retired to the Tropicana Bar at the Hollywood Roosevelt Hotel and were still lounging together poolside into the wee hours of the morning."

This past January at the Australian Open, Sharapova spent more than one night watching Roddick play poker in a casino.

The Herald-Sun reported back in January from Australian that Sharapova left an IMG player party early to go watch Roddick play poker in a casino's exclusive gambling rooms. Sharapova also saw him play cards on a couple other nights, leading to more speculation that the couple is more than just friends, Fox Sports reported.