San Antonio Spurs' Kawhi Leonard shoots during practice Wednesday in Miami. Leonard, who has helped the Spurs take a 2-1 lead over the Miami Heat in the NBA Finals, is the future of an old core of Spurs' players.

MIAMI — The Spurs are old.

Tim Duncan is 38, Manu Ginobili is 36, Tony Parker is the youngster in San Antonio’s star trio at 32.

Though it’s still their team, soon it will belong to Kawhi Leonard, who was 6 when Duncan played his first game with San Antonio and won’t turn 23 until later this month.

Leonard already has the quintessential San Antonio qualities down pat: Show up, work hard, play hard, win often, don’t say much, call it a day.

His star shone brightest in Game 3 of the finals against the Miami Heat on Tuesday with a 29-point breakout. And after that win, the Spurs will try to take a 3-1 series lead when the matchup resumes Thursday in Miami.

“I don’t think you’re ever going to get him to sit down and expound on a whole lot of things,” Spurs coach Gregg Popovich said. “He just wants to do his job. He wants to be a great player and go home. That’s basically who he is.”

It’s still hard to believe Leonard wasn’t exactly burdened by huge expectations when joining the Spurs.

“I just knew I wasn’t going to get the ball right away or just be a focal point with these great players on the team,” Leonard said. “But now I just try to play my game and go out there and be aggressive.”

He’ll be a focal point of the Miami defensive plan tonight.

And here’s other things to look for during Game 4 of the NBA Finals:

Must win for Miami

Miami’s season cannot end today. But if the Heat lose Game 4, the Spurs can safely go ahead and order that fifth championship banner. Only eight teams in NBA history have successfully rallied from 3-1 deficits, and none of those eight did it during the finals.

Improving Spurs?

Not many teams could open a game 19 for 21 from the field, beat a two-time defending NBA champion by 19 points on the road in a finals matchup, then say they have to do better — and mean it. Such is life with the Spurs. Manu Ginobili said the Spurs saw “many mistakes” on the tape of Game 3. “The thing is that we masked it with making so many shots. ... So the mistakes you made kind of faded away,” Ginobili said.