NBA free agent rankings - Futures of LeBron, Turner, more stars - ESPN

NBA free agency won't be the marquee part of this summer's offseason. A series of extensions have taken some of the biggest potential names off the market, including Jimmy Butler III, who extended after being traded to the Golden State Warriors at the deadline.

There are a handful of all-time greats who can become free agents depending on player options, led by LeBron James. But these players, including fellow former MVP James Harden and nine-time All-Star Kyrie Irving, already have made their way to desired destinations and are unlikely to change teams.

The combination of extensions and contract increases outpacing the salary cap's modest growth in recent years also means few teams will have cap space available. As ESPN's Bobby Marks has been tracking, only the rebuilding Brooklyn Nets will have max-level cap space, and it's possible no other team can spend appreciably more than the non-taxpayer midlevel exception (projected at $14 million).

Still, teams will have the ability to fill needs with targeted free agent signings. Last summer, the Detroit Pistons nabbed Malik Beasley on a one-year, $6 million deal and watched him finish second in Sixth Man of the Year voting as part of their playoff return. Just behind Beasley in the voting was Ty Jerome of the Cavaliers, added in free agency for just over the minimum prior to his breakout that was key to Cleveland finishing atop the Eastern Conference. Both players are among a deep group of top-tier reserves or lower-end starters who will define this summer's free agency period, which officially begins June 30 at 6 p.m. ET.

Let's run through my top 25 players, split into tiers based on their status and availability, with a special focus on a handful of key free agents such as