The ESPN 60 has officially grown into the ESPN 100 for the Class of 2015, and there are plenty of intriguing storylines among the top rising seniors in the country:

1. Top spot still up for grabs. Ivan Rabb has retained his spot as the top-ranked prospect in the Class of 2015, but make no mistake about it: This remains a very tight race that will continue to play out for the next 12 months. Rabb’s versatility and efficiency during the Elite Youth Basketball League regular season, in addition to his vast physical upside, were enough for him to retain his title. But he has plenty of competition. Ben Simmons has been coming on as strong in recent months as any prospect in the class, as he is now turning potential into production on a much more consistent basis. In a class full of scoring guards, Malik Newman stands out as the most talented of them all, and very likely the best pure scorer in the ESPN 100. Diamond Stone has had an equally dominant spring in the Under Armour Association, playing his way into the top four and asserting his claim as a contender in the race for the No. 1 spot.

2. Oh, Henry. No player has made a more dramatic jump up the rankings than Henry Ellenson, who went all the way from No. 47 to No. 5 in the ESPN 100. Ellenson averaged 18 points and 9 rebounds per game for Playground Elite during the EYBL season, showing a versatile and unique game for a 6-foot-9 power forward, all while continuing to raise his level of his production with each passing week. He can shoot the ball from the 3-point line but is also a threat to put the ball on the floor. He is perhaps most effective when he’s able to get out and run in transition.

3. Other risers. Ellenson is just the tip of the iceberg when it comes to players whose stock is rising. Jaylen Brown had a terrific spring on the adidas Gauntlet circuit and played his way into the top 10. Chase Jeter jumped more than 20 spots to land at No. 13, while Michigan State-bound big man Deyonta Davis moved up 30 spots to No. 18. Other spring stock risers include Justin Simon, who went from 45 to 23; Jalen Adams, 46 to 33; and Jalen Coleman, who hopped 24 spots to land at No. 34 in the ESPN 100.

4. Announcing his arrival. Previously a member of the 2016 class, Caleb Swanigan is making his debut in the 2015 rankings at No. 17 after announcing his reclassification last month. The wide-bodied 6-9 big man has nimble feet for a player of his size and an even bigger presence on the backboards. He led the entire EYBL in rebounding this season and was equally dominant cleaning the glass on both ends. His recruitment has also heated up, with Arizona and Kansas joining a long list of scholarship offers that already included Michigan State, Indiana, Purdue and many others.

5. More notable newcomers. While Swanigan might be the most notable of the new prospects in the ESPN 100, he’s far from the only one. In a class in desperate need of point guards, Corey Sanders has helped to fill a major void. He was unranked in the last ESPN 60 but now makes his ESPN 100 debut ranked No. 31 in the class. Former UConn commit Prince Ali is another prospect who was on the outside looking in the last time we updated rankings, but he has more than proved himself in recent months. Tres Tinkle, Admon Gilder and De'Jounte Murray make their debuts in the top half of the ESPN 100.

6. Down but not out. As some prospects go up the rankings, others must go down, but sometimes that’s just the spark of motivation they need to reassert themselves in the coming months. Jessie Govan and Terance Mann are examples of prospects who slipped out of the rankings at one point in time but are now trending back in the right direction. At No. 23, Tyler Dorsey is a prospect who could make another climb up the ESPN 100 before all is said and done, while the same can be said for P.J. Dozier, Charles Matthews, Doral Moore and K.J. Lawson.

7. Big and getting bigger. The 2015 class was already well known for the amount of size and frontcourt depth, but that has become an even bigger (no pun intended) trend in these most recent rankings. In fact, 11 of the top 15 ranked players in the class come at either the center or power forward positions, making this far and away the most frontcourt-dominated class we’ve seen in recent memory.

8. Plenty of positional size. Size is a characteristic of this class, not just among the frontcourt positions, but across each of the five positions on the floor. Even the perimeter players atop the class have terrific size relative to their spot on the floor. Jaylen Brown is no slouch of a wing at 6-5, while Brandon Ingram’s 6-8 frame is ideal. Malachi Richardson has equally imposing size at the shooting guard position at 6-6. Conversely, we don’t see a player 6 feet or under until Kendall Small (ditto on the no pun intended) checks in at No. 60.

9. Scoring guards. While the big men dominate the top of the rankings, many of the best guards in the class all seem to come from a similar prototype. They handle the ball more than natural 2-guards and yet are more focused on their individual offense than pure point guards. Instead, guys such as Newman, Antonio Blakeney, Allonzo Trier and Isaiah Briscoe can be best described as scoring guards -- guards who act as the primary playmakers for their respective teams but look for their own offense first and foremost before passing as a result of forcing the defense to collapse or rotate.

10. On the cusp. The final spots in the ESPN 100 are always some of the most debatable, essentially because there are so many prospects who can make a legitimate claim on the top 100 status. That was particularly true this year, when proven players such as Bryant Crawford and Rex Pflueger were left just on the outside looking in, along with other deserving prospects such as Joseph Toye, Matt Ryan, Chimezie Metu, Marcus Derrickson and several others.