After LeBron James and the Miami Heat won their second consecutive N.B.A. championship on Thursday, I noted on Twitter that James was on the same pace at the Chicago Bulls great Michael Jordan. Both James and Jordan won their first championship at age 27 and their second at age 28, I wrote. Jordan went on to win four more N.B.A. titles, for a total of six.
My statement depended on a technicality, I later discovered: Jordanâs biological age was 28 when he won his first championship in 1991 and 29 when he won his second in 1992. However, basketball statisticians generally define a playerâs age differently: by how old he was as of Feb. 1 of an N.B.A. season, the rough midpoint of the basketball calendar. Jordanâs birthday is February 17.
Those semantics aside, itâs worth considering just how likely James might be to meet or exceed Jordanâs total of six championships. (From this point on in the article, weâll ue the basketball statisticianâs definition of age.)
Players like Jordan and James are so rare that it can be risky to compare them to anyone else. Still, one reasonably useful benchmark is to evaluate players who, like James and Jordan, had won at least one M.V.P. Award and at least one N.B.A. title as of their age-28 season, meaning that they had achieved the pinnacle of both individual and team success.
By my count, there were 13 such players in N.B.A. history prior to James. On average, they won about two additional championships (more precisely, an average of 1.9) after their age-28 season. So a reasonable over-under line for James might be two more N.B.A. titles, or four total.
Itâs tough to say exact! ly what Jamesâs odds of catching Jordan might be, as the average conceals a wide range of outcomes among the individual players. Four of the players on the list â" Magic Johnson, Moses Malone, Bob Pettit and Dave Cowens â" would never win another championship after their age-28 season. But four others â" Jordan, Bill Russell, Bob Cousy, and Kareem Abdul-Jabbar â" would win four or more additional tiles.
James needs four more championships to catch Jordan, so one estimate of his odds might be 4 chances out of 13, or about 30 percent. But some of the favorable precedents, like Russell, came in an era when teams had far more ability to retain their players. Among the players on the list who played their age-28 season during the salary cap era (since 1984-85), only Jordan won four or more titles.
What seems safe to say is that you wouldnât want to bet on James at even money. There are just too many things that can go wrong with a playerâs career as he ages: injury or illness, early retiremnt, bad teammates or bad luck.
Even a team as strong as this yearâs Heat began the season with only about a 30 percent chance of winning the title, according to the Las Vegas odds. That percentage happens to roughly match the historical likelihood of an N.B.A. team repeating as champion, which is 33 percent.
So LeBronâs chances of winning a third title next season in Miami are probably about one-in-three. After that, his odds begin to decline. For one thing, James will be less certain to be surrounded by strong teammates. (James has the right to opt out of his contract after next season, and even if he stays in Miami, teammates like Dwyane Wade are already seeing their skills atrophy.)
More important, players in team sports typically see their skills peak in their mid-to-late 20s, meaning that Jamesâs ga! me might ! also begin to wane. The N.B.A. is a superstarâs league, and if James goes from being M.V.P.-caliber to mere All-Star by a few years from now, it will hurt his odds of winning further titles considerably.
In the chart below, Iâve estimated a playerâs chances of winning an N.B.A. title based his Win Shares, a statistic calculated by basketball-reference.com that measures a playerâs overall value to his team. The chart is built on data from all N.B.A. seasons since the introduction of the salary cap in 1984-85, excluding the two regular seasons (1998-99 and 2011-12) that were shortened by labor disputes.
During this period, the best N.B.A. player in the league in a given season has averaged about 18 Win Shares, which is a reasonably good match for Jamesâs performance over the last several years. The model estimates that such a player has about a 20 or 5 percent chance of winning the championship in todayâs N.B.A. environment.
What about the fifth-best player in the league â" someone equivalent to the worst player on the All-N.B.A. team? That player has averaged about 13 Win Shares â" which translates into only about a 10 percent chance of winning the championship instead.
Moving further down the chart, the 10th-best player in the N.B.A. at a given time has only about a 7 percent chance of winning a title, according to the model. And the 25th-best player â" someone who might be the last reserve added to one of the conference All-Star teams â" has only about a 5 percent chance.
This isnât much better than an N.B.A. player chosen at random, who has a 3.3 percent chance of becoming! a champi! on by virtue of being on one of the 30 N.B.A. teams. A borderline All-Star in the N.B.A., in other words, is much closer to being a role player than a superstar, at least when it comes to his odds of winning a championship.
James, of course, will have considerable freedom to pick his employer. If he put winning titles above all other considerations, he could sign on for whatever role at whatever salary with whichever team he perceived as having the best chance to win the championship in a given season.
Few players in N.B.A. history have been willing to take things to quite that extreme. Instead, superstars expect teams to build around them â" even if they are past their prime, and even if it means something as inglorious as Jordanâs late years spent with the Washington Wizards.
One can forgive Jordan, who didnât have anything left to prove. But to match him, James will need to win two or three more titles over the next several seasons while he still plays at an M.V.P. level - which wil require good health and some good luck. Then he may need to chase after the last couple of titles by being willing to play the right role with the right club.