Dominique Jones doesn't take to his Twitter account (@Dojo20) all that often, so when he does, presumably he's got something important to say.

Take Saturday night for instance when he issued this tweet: "Heading to Vegas next week on business."

And he means business. At least he better.

Jones missed the NBA's Summer League in Las Vegas last July because of the lockout. Even though he's heading into his third season, he's headed to the desert this week with plenty at stake following the Mavs' remarkable roster shakeup during the first week of free agency.

For the first time in his young career, Jones won't be log-jammed by a veteran crew at both guard spots and has a legitimate shot to earn playing time. The Mavs might be desperate for him to step up and seize the opportunity.

With Deron Williams staying in Brooklyn, Jason Terry off to Boston and Jason Kidd heading to New York, the Mavs' offseason plans now seem to revolve around signing young talent to short-term deals. Delonte West remains a possibility to re-sign. Ramon Sessions is a free-agent target at point guard. So is Aaron Brooks. Dallas native C.J. Miles and Courtney Lee, among others, are on the radar at shooting guard.

Rodrigue Beaubois won't be on the summer squad, but for the fourth-year guard this is also a huge summer as he heads into the final year of his contract. Finally healthy enough to train all summer, he should have the opportunity to become a regular rotation player.

Neither one had a memorable 2011-12 season. Beaubois totaled 12 minutes in the first-round four-game playoff sweep against Oklahoma City. Jones wasn't even active for any of the games, surprisingly supplanted by Kelenna Azubuike, whom the Mavs sent to Cleveland on draft night simply to get rid of his $1 million salary.

Into the second week of free agency, the Mavs have signed no one and still have just seven players under contract. Rotation spots will be up for grabs at several positions. It will be up to Jones and Beaubois to prove they deserve the time, starting with strong summer showings.