Harvey struck out 10 and allowed four hits over seven strong innings, but gave up a game-tying run in the Mets' eventual 2-1 defeat in 14 frames to the host Harrisburg Senators.
The 22-year-old right-hander -- New York's No. 3 prospect -- struggled to control the running game. The Harvey-Kai Gronauer battery allowed three stolen bases, and the the last was the most significant: Derek Norris walked on four pitches, swiped second base and scored three batters later on Chris Rahl's liner into left, tying the score, 1-1.
Rahl tripled and scored the Senators' second run with two outs in the 14th. Tim Pahuta's walk-off single off of reliever Rhiner Cruz (2-2) brought Rahl home, ending a four-hour, 14-minute ballgame that began one hour and 54 minutes after its original 7 p.m. ET start time. There were 100 plate appearances and 35 strikeouts in the rain-delayed game.
The seventh overall selection in the 2010 Draft, Harvey struck out the Senators' Bryce Harper -- the top pick in the same class -- twice on a total of seven pitches through the first four innings.
Harvey (0-3) had allowed 18 runs over his first five Double-A outings since being promoted from Class A Advanced St. Lucie. He allowed four runs on nine hits at Bowie in his Binghamton debut on June 26. With Thursday's start, his ERA fell from 7.15 to 5.76.
He compiled an 8-2 record and a 2.37 ERA in 14 starts for St. Lucie earlier this season. He struck out 92 Florida State League batters in 76 frames prior to his callup.
The former University of North Carolina standout's best outing of the season falls in line with Thursday's performance. In a May 27 FSL start, he completed seven three-hit scoreless innings and struck out 10, the only other occasion in his first pro season that he's reached double digits.
Harper, MLB.com's No. 2 prospect, also grounded out facing Harvey in the seventh, drew a ninth-inning walk and struck out looking in a one-out, bases-loaded situation in the 11th. The highly touted prospect went 0-for-5 overall and is batting .232 through 20 Double-A games.
Senators veteran starter Erik Arnesen allowed one Mets run -- Juan Lagares' seventh-inning homer -- on three hits over eight innings. Arnesen struck out nine and didn't walk a batter.