Corbin Burnes finally returned to a MLB mound Tuesday night, giving the Arizona Diamondbacks their first look at their ace in more than 15 months.

His previous appearance came June 1, 2025, at home against the Washington Nationals.

Burnes’ comeback against the Kansas City Royals was limited, but the overall results were encouraging considering everything required to get him back.

The right-hander spent the entire 2026 season on the 60-day Injured List before Tuesday.

His first Diamondbacks season ended after only 11 starts when a right elbow injury required Tommy John surgery.

Burnes initially targeted a return around the 2026 All-Star Break, but a right shoulder injury suffered during his rehabilitation forced him to abandon that timetable.

Against Kansas City, there were understandable positives and negatives after such a lengthy absence.

Burnes worked three scoreless innings, recording two strikeouts while surrendering two hits and two walks.

One of those hits was a double that deflected off Tommy Troy’s glove in center field, although the play should have been scored an error.

Burnes consequently finished his first start with a 0.00 ERA.

He did not pitch long enough to qualify for the win, but he gave Arizona an opportunity to win, which is exactly what the Diamondbacks will need from him moving forward.

Burnes required 57 pitches to complete three innings and was likely operating under a limit of approximately 60.

A 10-pitch battle with Vinnie Pasquantino in the third inning contributed to the elevated total, as did his two walks, preventing Burnes from working another frame.

Command remains part of the rebuilding process.

Only 35 of his 57 pitches were strikes, and Burnes did not begin consistently locating his curveball, slider and changeup until later in the outing.

His cutter command was solid, although there remains room for improvement.

Considering the circumstances, however, the outing represented a successful first step.

Burnes’ greatest strength during the appearance may have been his ability to compete without having complete command of his arsenal.

Experienced pitchers understand that their best stuff will not always be available, particularly after such a long rehabilitation.

Burnes showed that he can still navigate trouble, make adjustments and escape innings without allowing damage.

That ability separates established frontline pitchers from those who depend entirely on overpowering hitters.

His pitch sequencing and understanding of how to change an opponent’s timing should become increasingly important as his command returns.

There is also no reason for Arizona to demand immediate perfection.

Each appearance gives Burnes another opportunity to regain feel for his secondary pitches, rebuild endurance and become comfortable competing against MLB hitters again.

He may not resemble his former ace self immediately.

For the Diamondbacks, Tuesday provided something more important: evidence that Burnes can still find ways to get outs while working his way back.