Harvey allowed one run on an infield single and then shortstop Ruben Tejada had a throwing error, after which another run came around to score. The Mets contend that the second run should be unearned, as a result of the error.

"I didn't think it was an earned run," Mets manager Terry Collins told MLB.com Saturday .

If the ruling is reversed, Harvey would be charged with just one run in 7 1/3 innings, lowering his ERA to the season from 1.55 to 1.41. 

Harvey held the Cubs to just two earned runs in 7 1/3 innings, and even his two runs could easily been unearned, as they came to score on an infield single and throwing error in the first inning. He held the Cubs to just five hits overall and walked no batters, while striking out six.

Harvey improved his record to 5-0, while his ERA rose slightly, to 1.55. He will attempt to remain unbeaten in his next start, Wednesday against the Reds. 

Now, it appears the club is facing another difficult decision regarding the emerging superstar as he has already logged 56 1/3 innings through eight starts, putting him on pace for 232 1/3 innings over 33 outings. The season is still less than two months old, giving the Mets ample time to determine whether Harvey will make a rare 60-inning jump and exceed 200-plus innings or if his season will be cut short again, especially if the team is not in playoff contention.

"It all depends on the individual and the composition of his individual innings," assistant general manager Paul DePodesta told ESPN.com. "Pitch counts, stress of pitches and rest all factor in the final equation. ... All of these factors and more will be taken into account as we move through the season with Matt, and all of our other young pitchers."

Harvey seemed to lack his usual overpowering stuff and surrendered more hits in the first three innings (three) than he's permitted in three starts this year, including his previous outing when he held the White Sox to one hit over nine innings. He also walked two batters and struck out a season-low four in the no-decision.

Harvey has displayed the ability to bounce back following lackluster outings before and will attempt to halt a four-game winless skid Friday at the Cubs. In three starts on the road this season, the righty has garnered two wins and a 1.33 ERA over 20 1/3 innings.

"The competitiveness and the composure, which is like Verlander," White Sox third base coach Joe McEwing said. "He just attacks hitters. He has very good stuff, similar to Verlander. He shows four pitches, pitches at 95-96 [mph] and locates. It is pretty impressive. But I am telling you what is special is the composure and the competitiveness."

Harvey struck out a career-high 12 batters Tuesday, while allowing one hit in nine scoreless innings. He's allowed more than one run just once in seven starts, resulting in a 1.28 ERA.