Plus, when facing each other in the NBA Finals, both has won one, lost one.
Here comes the tiebreaker a Finals rematch that will have high expectations.
Miami and San Antonio are the league's last two teams standing for the second consecutive year, their next chapter starting on the Spurs' home floor Thursday night.
The Heat won a wild series last season for their second straight championship, needing a frantic rally to avoid elimination in Game 6 and then riding the strength of a 37-point, 12-rebound effort from James to top the Spurs in Game 7.
"I think our guys, they actually grew from the loss last year," Spurs coach Gregg Popovich said. "I call it fortitude. I think they showed an unbelievable amount of fortitude. If I can compliment my own team humbly, to have that tough loss, especially the Game 6 and not have a pity party and come back this year and get back to the same position, I think that's fortitude."
It's the league's first Finals rematch since Chicago and Utah played in 1997 and 1998.
The teams have actually played three times since last season's classic series ended, twice in the regular season, another being a preseason meeting in Miami where the Spurs acknowledged that the pain of losing Game 7 on that floor was still real.
Then again, it's almost like they wanted to feel that hurt at times. Popovich showed the Spurs clips of Games 6 and 7 early in training camp this season, not so much to open old wounds but rather speed up the healing process.
"We were just trying to put it away, just get over that part of it, learn from it, and move forward from there," said Duncan, a champion in 1999, 2003, 2005 and 2007.
Duncan's Spurs swept James' Cleveland Cavaliers in 2007.
This season, San Antonio won 62 games, the best record in the league. One of those wins was a 24-point romp over Miami, on the same floor where this series will start on Thursday.
The Heat know what wanting revenge feels like. They lost the 2011 NBA Finals to Dallas, then opened the following season on the Mavericks' floor and simply blew them away.
Heat forward Chris Bosh called it "extra motivation" for the Spurs.
"It's just something that we have to deal with, and we know that they're going to be very passionate, and they're going to play some good basketball," Bosh said. "So whoever we play, we just have to continue to keep our approach the same and play good basketball."
While the Spurs were punching their ticket by ousting Oklahoma City from the West finals on Saturday night, the Heat were getting a day off. James was taking his kids to see X-Men. James Jones went to a home-improvement store for some supplies. Bosh insisted he was going to do as little as possible, and Heat coach Erik Spoelstra isn't summoning his team to practice again until Monday.
By then, James will be locked in on the Spurs.
"It hasn't really hit us that much yet because I think we're in it," James said Friday night after Miami beat Indiana and clinched its fourth consecutive East championship. "I think it will once we're done and we're able to look back at what we were able to accomplish as players, as a franchise. I think that's when it will really hit us. We definitely don't take it for granted to be in this position."
So for the next few days, all the highlights of last year's finals will be played over and over again.
The shot by Tony Parker who missed the second half of Saturday night's game with a left ankle injury to win Game 1 in Miami for the Spurs. James' twirl-on-the-rim dunk as the Heat pulled away in Game 2. San Antonio sharpshooter Danny Green's Finals-record 3-point display. Bosh's rebound that led to Ray Allen's shot that saved Miami's season in Game 6. The yellow rope, the precursor to a Spurs celebration that never happened.
All made for an epic series.
The encore could be even better.
"Obviously we are very happy and pleased with the season we have had so far, but we are not by any means satisfied," Green said. "We know we have a lot of work to do against a very good team. There is a reason why they're back there and are two-time champs. We have our work cut out for us, but we are happy with going back just not satisfied."
P San Antonio Spurs vs. Miami Heat
All games on Ch. 4
Thursday • at San Antonio, 7 p.m.
Sunday • at San Antonio, 6 p.m.
Tuesday, June 10 • at Miami, 7 p.m.
Thursday, June 12 • at Miami, 7 p.m.
x-Sunday, June 15 • at San Antonio, 6 p.m.
x-Tuesday • at Miami, 7 p.m.
x-Friday • at San Antonio, 7 p.m.
x if necessary