With the Rule 5 draft now less than three weeks away, teams had until 8 p.m. ET on Friday to protect eligible players from potential selection by adding them to the 40-man roster. You can find a complete list of additions elsewhere, but for our purposes, we've decided to highlight five notable ones.

Do keep in mind that these aren't necessarily the five best players added to rosters on Friday, just the five we felt deserved some recognition for various reasons.

Appel was traded to the Phillies last winter. USATSI

1. Mark Appel, RHP, Phillies

You've heard of Appel before. He was the no. 1 pick in the 2013 draft -- the same class that produced NL MVP Kris Bryant, Jon Gray, and others who have since began putting together their big-league careers. All the while, Appel has spun his wheels with unimpressive minor-league efforts. He was dealt by the Astros to the Phillies in last winter's Ken Giles trade, and his first year in the new organization didn't go well. Appel posted a 4.46 ERA and 1.70 strikeout-to-walk ratio in eight starts, then underwent season-ending in June. He's expected to be ready for spring training, and should make his big-league debut in '17. We'll see if he can live up to mid-rotation expectations -- it seems highly unlikely he'll ever justify his draft slot, however.

2. Amed Rosario, SS, Mets

With due respect to Asdrubal Cabrera, Rosario is the most exciting shortstop in the New York system. He'll turn 21 in a few days' time, and he's coming off the first season in which he hit .324 across two levels -- two levels in which he was roughly three years younger than the average player. Rosario can run, he can throw, and he should stick at shortstop. He has the chance to be a solid hitter as well. That's a heck of a player -- and one who could reach the majors before the season's out.

3. Josh Hader, LHP, Brewers

Acquired in the Carlos Gomez trade, Hader doesn't look like your typical starting pitcher prospect. He's reedy, he wears glasses, he has long hair, and -- oh yeah -- he has a crossfire delivery and low arm slot that makes him tough on same-handed hitters. Add in Hader's impressive fastball-slider combination, and it's going to be difficult for any left-handed batter to ever square him up. Provided Hader can find some semblance of command -- and can keep righties off his back -- he has the chance to be more than a mid-rotation starter. You'll see him at Miller Park in 2017.

4. Max Fried, LHP, Braves

A key piece of the Justin Upton trade, Fried has since slid down the Braves' prospect list rankings for two reasons: 1. his slow recovery from Tommy John surgery, and 2. the organization's unsatiable desire to add young arms through the draft and trades. Still, Fried remains an intriguing arm -- one who, at his best, had a plus fastball-curveball combination. He's a ways away from the majors, but the Braves had every reason to protect him from selection. Someday Fried could be pitching near the front of their rotation.

5. Rowan Wick, RHP, Cardinals

You won't find Wick on a prospect list. That's okay, he's interesting all the same for one simple reason: he's new to pitching. Originally an outfielder selected in the ninth round, Wick was converted to the mound full-time in 2016. He made 44 appearances across two levels, including Double-A, striking out nearly 12 batters per nine. Predictably, Wick didn't exhibit great command (he walked nearly a batter every other inning), but he has impressive arm strength and he's in the right organization to make a successful transition, given what the Cardinals have done with past hitters-turned-pitchers -- think Jason Motte and Trevor Rosenthal, though Sam Tuivailala is probably the truest comparison.