Good Mario apparently has chosen to stay around for a while.

Uneven through the first three rounds of the playoffs, Miami Heat backup point guard Mario Chalmers has now strung together three productive efforts in these NBA Finals, allowing the Heat to take a 2-1 lead in the best-of-seven series against the Dallas Mavericks.

"But it's about consistency," coach Erik Spoelstra cautioned Monday, as the Heat looked ahead to Tuesday's Game 4 at American Airlines Center. "So can he do it again?"

After shooting 3 of 8 in each of the series' first two games, Chalmers shot 4 of 8 in Sunday's 88-86 Game 3 victory, each conversion a 3-pointer.

At 8 of 19 on 3-pointers in the series, the third-year veteran has helped keep the Mavericks' zone defense honest, the only player on the roster other than LeBron James shooting above 40 percent from beyond the arc in the series.

"He is not afraid and is not going to shy away from the moment," Spoelstra said.

Averaging 11 points per game, Chalmers is the Finals' only reserve beyond the Mavericks guard Jason Terry scoring in double figures.

As has been the case throughout his pro career, it has been an uneven postseason ride. After shooting 13 of 35 in the opening round against the Philadelphia 76ers, Chalmers shot 4 of 15 on 3-pointers in the second round against the Boston Celtics.

That was followed by 10-of-16 shooting against the Chicago Bulls in the Eastern Conference finals, a series when he succumbed to the defensive pressure of C.J. Watson, utilized for only 90 minutes over the five games.