The NBA Draft. It is one of the most important days on the NBA calendar for GMs as they try to pull of big moves, to try and turn the fortunes of their franchises around. Throughout NBA history, trading draft picks has been risky, but at the same time highly rewarding if you get it right. Draft trades have laid the foundation for dynasties and in some cases thrown away the future of a franchise. In the past, the NBA world has seen players like Bill Russell, Kobe Bryant, Scottie Pippen, Kevin McHale and Dirk Nowitzki have all been acquirred by draft day trades. The following picks are all picks that are all quite likely to be on the move. So in the days leading up to Thursday's draft, make sure you keep a keen eye out for possible trades.

4th Overall Pick, New York Knicks

The New York Knicks are in an odd situation with their current draft spot. Going into the draft lottery, they had the second best odds at getting the number 1 pick, however they ended up with the 4th pick. This has sent their plans into disarray. After previously thinking that they were guaranteed one of Karl-Anthony Towns, Jahlil Okafor, or D'Angelo Russell, the Knicks, in all likelihood, will not get any of them. 

Any of the top 3 would be perfect for the Knicks, but now that they are probably out of the running for all 3 they will have to look in another direction. One possible route with the 4th pick would be to take Emmanuel Mudiay, arguably the top talent with the most upside on the board after the top 3. But questions about Mudiay's decision making, consistency and shooting ability do not make him a great fit in Phil Jackson and Derek Fisher's triangle offense. 

Another possibility would be selecting Kristaps Porzingis. The young Latvian has shot up draft boards recently and seemingly has an immense level of talent on his hands. However, selecting a power forward, such as Porzingis, may ruin their chances at such free agents as Paul Millsap, Kevin Love and LaMarcus Aldridge. 

The Knicks' biggest glaring need is finding a real centre, unless you consider Cole Aldrich as a long term answer. One who can be the backbone of their defense, which was pitiful at best last year. So, the ideal prospect here seems to be Willie Cauley-Stein. The big shot blocking center out of Kentucky. The only problem with targeting Cauley-Stein, is their pick is slightly too high and selecting Cauley-Stein here would be too much of a reach. 

This is where there is a possibility of a trade comes in. 

By trading down, the Knicks could pick up another valuable asset, as well as acquiring the prospect they want and the prospect that fits their team best. 

6th Overall Pick, Sacramento Kings

At pick number 6, the Kings are in a similar position to the Knicks. Like the Knicks, they are stuck in a position where ideal prospects are probably not on the board by this point. Most mock drafts have the Kings taking Mudiay here but there are some problems with taking a point guard for Sacramento. As mentioned above, Emmanuel Mudiay probably won't be picked by the Knicks and could very well fall into Sacramento's lap. But last year's free agent pick up Darren Collison impressed in the 45 games he played last season. The former Clipper averaged 16 points and 6 assists on 47.3% shooting during his first season as a King. The Kings signed him to a 3 year deal and with 2 years still left on his deal, they probably should persist with him and instead draft a position that is more of a need.

The biggest position of need for the Kings, is finding another big man that can partner up and compliment DeMarcus Cousins. Staying at 6 and hoping Willie Cauley-Stein falls into their laps is one idea for fixing this problem, but while the defense would improve, spacing on offense would be a massive problem, especially in George Karl's up-tempo system. 

There are two main big men that would compliment Boogie perfectly. The first of which is Karl-Anthony Towns. But a trade up to either pick one or two is probably out of reach, without the necessary assets. A more realistic target is Kristaps Porzingis. Porzingis can spread the floor on offense, has crazy athleticism and would protect the rim for DMC on defense. He is a perfect fit in every sense of the word. This means that trading up should be their move, if they want to go for the tremendously skilled Latvian. 

Could the Kings trade up with the first team on this list? Giving up a piece such as Ben McLemore would be what the Knicks would be looking for in order to move down. 

16th & 28th Overall Picks, Boston Celtics

The Boston Celtics have a very young roster, with a mountain of assets and too many draft picks to count. So for Danny Ainge and his crew, this off-season will be the start of turning all of that into top tier talent. Talent that can take the Celtics back to the glory days. All of that starts with Ainge's 2015 draft picks. At the 16th and 28th spots, the Celtics can't really draft any of that top level talent needed to help take them to the top of the Eastern Conference. 

So this leaves the Celtics with the option of trading their picks. 

The Celtics have two main options in a trade scenario. The first option is trading up in the draft, somewhere in the top 10 and grabbing themselves another young stud. The second option is to trade one or both of their picks in exchange for a veteran that could help them in the short term. 

The Celtics have two main needs if they were to trade their picks. A go to scorer and a rim protector. A go to scorer is unlikely to be acquired through the draft, without trading up to one of the top 3 or 4 spots, so rule that possibility out. But a rim protector like Willie Cauley-Stein would not be out of the question at all. 

If they were to trade for some more established talent, there aren't many names on the trade block except for Denver's speedy point guard Ty Lawson. Lawson doesn't exactly fill a need at point guard, but the Celtics have been linked with him since before the trade deadline. Lawson is a great asset and has proven himself to be a great player at NBA level. Since the Nuggets will be heading into full rebuilding mode, Lawson could definitely be available and at the right price, Ainge could strike. 

18th Overall Pick, Houston Rockets

The Houston Rockets are in an incredibly favorable situation this off-season. With a boatload of expiring contracts, the Rockets will have the necessary cap room to target one of the top free agents in this year's class. Power forwards like Kevin Love, LaMarcus Aldridge and Paul Millsap will all be available as well as point guards Brandon Knight and Goran Dragic. All of those players would be excellent additions to the team for next season and would help the Rockets chase their title dream. 

The Rockets, along with cap space also have the 18th pick in this year's draft, acquired from New Orleans in exchange for Omer Asik. This gives H-Town yet another chance to improve their roster. But with the pick being that late in the draft, selecting a player in that spot probably won't help their title chase right away. Trading the pick away, for Houston, would make the most sense. 

Morey and co. could trade the pick away just to give themselves even more cap space. By trading the pick away, the Rockets would not have to pay their draft choice and would instead put even more money towards their chase of free agents. Given Daryl Morey's history, this will likely be the option that his front office chooses. 

The Rockets do have another option. That option would be to trade up in the draft and select a prospect that could help them right away. Seemingly the best option for them would be to trade up and grab former Murray State point guard Cameron Payne. Payne would be available around the late lottery and could be a replacement for the injury prone Patrick Beverley. 

Whatever the Rockets do, look for Daryl Morey to be extremely aggressive. 

The NBA Draft is always exciting and action packed. But for these four teams, the draft could get especially interesting.