Kyrie Irving's only been a Dallas Maverick for a couple days, but he's clearly feeling right at home with his new team ... throwing alley-oops and buzzin' around the court in his practice debut on Tuesday.
The point guard -- who was just traded from Brooklyn to Big D on Sunday -- was reportedly the first player at the workout ... and it didn't take long for him to flash his signature skills.
Irving, rockin' a blue Mavericks shirt and black sweats, put on a show in 5-on-5 drills in a gym at USC .