Bieber-licious NBA 2K13 has sold-in (i.e. "shipped") 4.5 million units to date, publisher Take-Two announced today as part of its third quarter financials.
2K Sports previously noted NBA 2K13 sold 49 percent more worldwide during its first-week sales than previous record holder NBA 2K11. The franchise has now shipped over 15 million units since NBA 2K11.
Part of the series' success has been the lack of competition from Electronic Arts. Last year's NBA Live 13 was canceled, after already being downgraded to a digitally distributed product. It was the third consecutive year EA dropped the ball and didn't show up to compete with a basketball game.