The Orioles have agreed to a $525,500 signing bonus with their 2013 third-round draft pick Stephen Tarpley, a left-handed pitcher from Scottsdale (Ariz.) Community College.

Tarpley is the highest pick that has agreed so far with the team, and he did so at the suggested slot bonus for the 98th overall selection.

The club has not exchanged figures yet with its top pick, North Carolina high school right hander Hunter Harvey (22nd overall), presumably waiting for some of the lower drafted players to sign first. The Orioles are in negotiations, however, with supplemental first rounder, Georgia prep outfielder Josh Hart, and second-rounder, California prep catcher Chance Sisco, according to an industry source.

Orioles scouting director Gary Rajsich would not comment on the reported signings or individual negotiations, but he said the club is in talks with roughly 20 players that were selected last week.

The Orioles have not announced any of the agreements or the numbers involved – they typically wait until the players are medically cleared and paperwork is filed and they don’t reveal the bonus amounts – but according to an industry source, the Orioles have agreed to exact slot with two Top 10 players: Tarpley and eighth rounder Trey Mancini ($151,900), a first baseman out of Notre Dame.

Also, according to sources, the club has agreed to terms with at least two other Top 10 picks, catcher Alex Murphy, a sixth-round pick out of Calvert Hall and 10th round catcher Austin Wynns from Fresno State.

Murphy’s bonus is believed to be in the neighborhood of the $218,500 slot for his draft position.

Wynns, who is a college senior and therefore has less leverage, likely did not command the $135,300 slotted for a 10th rounder.

Several other Orioles’ draftees have signed including shortstop Jeff Kemp, a 33rd rounder out of Radford University that played high school ball at Archbishop Spalding High School. His bonus was roughly $2,500.

Baseball America, which first reported that Tarpley (98th overall) had agreed to terms Thursday, had the left-hander ranked as the 123rd best prospect available in last week’s draft.

This spring, Tarpley was 3-2 with a 2.35 ERA in 16 games (15 starts) for Scottsdale Community College. He struck out 108 batters in 92 innings with a fastball that can touch 96 mph.