The excuse was built-in for Saturday night’s game.

It just would be a futile one for the younger team when the reason for any slippage in play applied to the Phoenix Suns and Dallas Mavericks, who both played Friday night and then flew to Phoenix.

It is good to be the NBA’s seventh-youngest team, as the title of second-most inexperienced becomes less apparent.

The Suns’ legs looked no worse for the wear Saturday when made a season-high-tying 15 3-pointers and posted a season-high points total in a 123-108 victory over veteran-laden Dallas at US Airways Center.

The Suns entertained the flip side of Friday’s rally at Denver when its 15-point lead slipped to striking distance, but Dallas (15-12) never could chase down the Suns.

Phoenix won the hard way, using long-range shots to outduel Dallas’ close strikes and score more than any Mavericks opponent had this season.

The Suns shot nearly as well from beyond the arc (15 for 30, 50 percent) as inside it (29-56, 52 percent) to survive early turnovers and another night of an opponent feasting on them for interior scoring. Phoenix (16-10) gave up more points in the paint (62) than they had to any team this season but still cruised down the stretch after Dallas had pulled within six with 8:31 to go.

“Offensively, it was probably our best game,” Suns coach Jeff Hornacek said.

A night after needing its bench to rally from a 21-point hole, the Suns were balanced and never trailed after the first two minutes. Gerald Green has recaptured his hot shooting in a bench role this weekend, and Channing Frye continued a torrid shooting stretch.

They each made four 3s, the fifth occasion for Frye in the past month. Since Nov.15, Frye is shooting 51 percent from 3-point range. He scored 18 and shared the team rebounding lead with eight.