Heat guard Mario Chalmers saved his best game of the season for the biggest stage. Chalmers had 20 points Tuesday in the Heat's 103-97 victory against the Oklahoma City Thunder. The Heat's streaky point guard was 8 of 14 from the field and 4 of 8 from three-point range. He also had three rebounds and two assists in 37 minutes. Chalmers was averaging 6.5 points and 24.8 minutes per game before his Christmas Day breakout. "No one ever doubts Rio in big games," Heat coach Erik Spoelstra said. "You want him in your foxhole when the pressure is high." Chalmers had 12 points in the first quarter, matching his season high. His five consecutive points in the fourth quarter gave the Heat an 86-77 lead. "We're clearly a better team when he is at his best," Spoelstra said. "You have to have everyone as a live offensive threat. Everyone has to have balance."