Sean Merriman, BTN.com web editor, April 10, 2015

Just because the 2014-15 college basketball season is in the books, that doesn't mean the excitement surrounding college basketball is over.

This is the time of year where underclassmen across the country begin to make their final decisions on whether or not they will enter the NBA draft.

To clarify the rules, college underclassmen who don't turn 22 this year have until April 26, 2015 to declare themselves eligible for the upcoming NBA draft.

So, we ask, who's in, who's out, and who's undecided? Here is an updated breakdown of potential Big Ten draft prospects and where they stand heading into this weekend.

IN THE DRAFT

Sam Dekker, Wisconsin: After an outstanding NCAA Tournament run, Dekker made it official on Friday that he will forego his final season of eligibility at Wisconsin and enter the 2015 NBA Draft. Dekker started 81 games in his career at Wisconsin, finishing 15th in school history with 1,363 points. He averaged more than 19 points and 5.5 rebounds per game in this year's NCAA Tournament.

Terran Petteway, Nebraska: Coming off a disappointing 13-18 season that saw Nebraska go 5-13 in the Big Ten, Petteway announced he will take the next step and enter the NBA Draft. The Huskers' standout guard ranked fourth in the Big Ten in scoring at 18.2 points per game, while also placing among the Big Ten leaders in 3-pointers (2.2, eighth), assists (2.8, 14th) and steals (1.1, 15th) per game.

D'Angelo Russell, Ohio State: After a spectacular freshman campaign, Russell made it official on Thursday, announcing he will enter the 2015 NBA Draft. Russell led all freshmen in the nation in scoring (19.3), while also averaging 5.7 rebounds and 5.0 assists per contest on his way to earning Freshman All-American honors. The 6-5 star point guard is widely considered to be a Top 5 selection in this year's draft.

STAYING IN COLLEGE

Nigel Hayes, Wisconsin. Hayes took a big jump from his freshman to sophomore season, but despite his improvement, he made the decision to stay in Madison. With Dekker and Frank Kaminsky off to the NBA, Hayes will be looked at as a go-to option on offense in 2015-16. Don't be surprised to see his draft stock raise even more next season and possibly land a spot in the lottery.

Jake Layman, Maryland. Layman had an impressive junior season, averaging 12.5 points and 5.8 rebounds per game. He has good size and athleticism to be a swing forward at the NBA level, but the decision to come back next season makes Maryland the hands-down favorite in the Big Ten, as well as a top 10 team in the nation heading into next season. Plus, playing alongside a point guard as talented as Melo Trimble makes anyone better, right?

Melo Trimble, Maryland. Trimble had an outstanding freshman season at Maryland, guiding the Terps to a second-place finish in the Big Ten standings and a No. 4 seed in the NCAA Tournament. Most had Trimble pegged as a late-first or early-second round pick, had he declared for the draft this year. Now, with another year under his belt, and a chance to play alongside incoming freshman Diamond Stone, in addition to Layman, Trimble should solidify himself as a first-round lock, whenever he does decide to make the jump to the NBA.

Troy Williams, Indiana. One of the top athletes in the Big Ten, Williams made the choice to stay in Bloomington and work on the fundamentals of his game. From a pure athleticism standpoint, this guy is ready to make the move to the NBA. But with another year of coaching under his belt, Williams could develop into a future first-round selection.

Caris LeVert, Michigan. LeVert was a 2014 preseason All-Big Ten honoree, but he was limited to just 18 games last season after a season-ending foot injury. In those 18 games, LeVert led the Wolverines in scoring (14.9) rebounding (4.9) and assists (3.7). If he can stay healthy, this guy is an All-Big Ten quality player.

A.J. Hammons, Purdue. Hammons announced he will be coming back to Purdue after he helped lead the Boliermakers to their first NCAA Tourney apperance in three years. The 7-0 senior-to-be led Purdue in scoring and rebounding last season, averaging 11.6 points and 6.6 rebounds.

UNDECIDED

Yogi Ferrell, Indiana