NBA’s Top Five Most Significant Free Agent Signings

July 5, 2015 Updated: July 7, 2015

When former Portland Trail Blazer LaMarcus Aldridge announced his intentions to sign with the San Antonio Spurs on Saturday, it completely shifted the balance of power out West: Portland, which won 51 and 54 games the past two years, is suddenly without their franchise cornerstone and will likely head into rebuilding mode (read: last-place). Meanwhile, San Antonio now becomes a heavy favorite to win their sixth title in the Tim Duncan-Gregg Popovich era.

Whether the move will spur the Spurs to another ring will be seen, as will how well free agent Aldridge meshes with the core of the San Antonio team. If he meshes well, the $80-million signing will go down as one of most significant free agent signings of the last 20 years. Here are the top five:

1. LeBron James to the Miami Heat in 2010; to the Cleveland Cavaliers in 2014 (tie):

Whenever a former MVP changes location, it’s major news. When James, then just 25 but already with a pair of MVPs under his belt, announced he was taking his talents to South Beach it instantly made the Heat contenders. Miami won the Eastern Conference all four years with James on board, including a pair of titles in 2012 and 2013. Meanwhile, the Cavaliers sank to the bottom of the league, winning the draft lottery three times in four years.

Then when James returned home in 2014, the Cavs became contenders again, making it all the way to the NBA Finals, while Miami missed out on the playoffs. He is clearly the biggest difference-maker in the NBA.

2. Shaquille O’Neal to the Los Angeles Lakers in 1996:

When the Lakers convinced Shaq to leave Orlando and take their seven-year, $121 million offer, it changed the fortunes of both franchises. The Lakers instantly became contenders, eventually winning three straight championships in 2000, 2001, and 2002. Meanwhile, Orlando went from a major power in the East to a fringe playoff team.

3. Steve Nash to the Phoenix Suns in 2004:

Nash wasn’t seen as a difference-maker like Shaq or James was when he switched teams in 2004. But the Suns and head coach Mike D’Antonio had a plan to use him to push the pace and it worked to perfection. Phoenix went from 29–53 in 2003-04 to 62–20 in 2004-05 with Nash at the helm and they would stay as one of the better teams in a loaded West through 2010.

4. Dikembe Mutombo to the Atlanta Hawks in 1996:

Mutombo’s defection to Atlanta wasn’t completely unexpected as the Nuggets went just 35–47 in the 1994-95 season—his final year in Denver. With Atlanta, the Hawks went from a 46-win team in 1995 to 56–26, 50–32, and then 31–19 in the strike-shortened season of 1999. Mutombo won the Defensive Player of the Year award in each of his first two seasons with the Hawks as head coach Lenny Wilkens molded the team into a contender. Were it not for Michael Jordan and the Bulls, perhaps the Hawks would have won the East one of those years.

5. Chris Bosh to the Miami Heat in 2010:

Although LeBron James was the main attraction in the 2010 free agency class, Chris Bosh was right behind him. When they both committed to joining the Heat that summer, along with Dwyane Wade, the trio became the envy of the rest of the NBA.

Bosh was a major factor in keeping the lane open for slashers James and Wade though, as opposing centers, they had to respect his outside shot. Bosh elected to stay with Miami last summer, but the Heat suffered without him down the stretch and fell out of the playoffs. A healthy Bosh figures to be a major part of a re-loaded Heat team in 2016.