Patty Mills, of the San Antonio Spurs, during the third game of the playoff series.

Patty Mills, of the San Antonio Spurs, during the third game of the playoff series. Photo: AFP

Canberra's Patrick Mills is just two wins away from realising his childhood dream, but the San Antonio Spurs point guard is refusing to get caught in the hype and says he's using the "big stage" of the NBA Finals to fly the flag for Australia.

The red-hot Spurs blew the star-laden Miami Heat away in game three of the championship series, producing one of the best shooting performances in play-off history to seal a 111-92 win in Miami.

It moved the Spurs to a 2-1 lead in the best-of-seven series, placing Mills on the cusp of a dream NBA title.

Patty Mills, of the San Antonio Spurs, during the third game of the playoff series.

Patty Mills, of the San Antonio Spurs, during the third game of the playoff series. Photo: AFP

The 25-year-old provided the crucial energy when the Heat started to launch a second-half comeback.

His five points, four assists, two rebounds and one steal in 15 minutes of game time were impressive, but commentators heaped praise on the point guard for his desperation.

In the fourth quarter he dived on the floor for a loose ball and flicked it to teammate Manu Ginobili, who raced away for a dunk.

The pint-sized point guard is making his mark in the league of millionaires and has played an important role in the Spurs' success.

"All the guys on the team from different countries are representing and flying the flag very high and proud," Mills said after the win. 

"And that is what I am doing. Using the big stage to fly the flag and let everyone know that I am representing Australia just as much as the Spurs and my family."

Mills is off-contract at the end of the season and is yet to decide whether he will stay with the Spurs or chase more game time at another NBA franchise.

The Spurs blitzed the Heat in the first half, shooting a play-off record 75.8 per cent from the field to lead 71-50 at half-time.

"I don't think we will ever shoot 76 per cent in a half ever again," Spurs coach Gregg Popovich said.

Spurs had 11 players who scored, with forward Kawhi Leonard leading all with 29 points and guards Danny Green and Tony Parker each adding 15.

After dominating game two in Sunday's victory with 35 points and 10 rebounds, the Heat's LeBron James was relatively tepid with 22 points and five rebounds.

Spurs cooled off in the second half, but they still ended the game shooting 59.4 per cent.

"The challenge for Leonard] and for all of us is to maintain that energy and effort and be consistent for the rest of the series," Mills said. 

"He is a very important guy for this team and when he performs well we tend to feed off that energy. 

"He learnt from the first two games on what he needed to do better and he came out here and showed it tonight." 

Game four will be played in Miami on Friday (AEST).

AAP