Merrill Kelly was tipping pitches, Diamondbacks acknowledge after Cubs exploit

The Diamondbacks acknowledged that Merrill Kelly was tipping his pitches in a recent outing against the Cubs, per Bob Nightengale, and that Chicago third-base coach Quintin Berry identified the tell and relayed it to his hitters. Arizona confirmed that Berry's actions were legal, as he remained in the coach's box throughout.

The admission is a rare public acknowledgment of one of baseball's oldest cat-and-mouse games: the search for a pitcher's unintentional signal, and the ethical line between observation and gamesmanship. Berry stayed within the rules, and the Diamondbacks did not dispute that.

What happened

Kelly was tipping pitches during a game against the Cubs, and Berry noticed it from his station at third base, Nightengale reported. The Diamondbacks confirmed both the tip and Berry's role in exploiting it. Arizona also confirmed that Berry operated within the boundaries of the game, never leaving the coach's box to gain an advantage.

The nature of the tip — whether it involved Kelly's glove position, his leg kick, his grip, or some other mechanical tell — was not disclosed. Nor was the specific game identified, though the Diamondbacks' confirmation suggests it occurred recently enough to warrant internal review.

Tipping pitches is an unintentional giveaway, distinct from sign-stealing. A pitcher tips when his body language, grip, or delivery betrays what pitch is coming. Coaches and players are free to watch for it, and to act on it, so long as they do so from legal vantage points. Berry's position in the coach's box — a rectangle chalked along the third-base line — kept him on the right side of that line.

Why it matters

Kelly has been a fixture in Arizona's rotation for years, and any mechanical flaw that telegraphs his arsenal is a problem the club will want to address immediately. Tipping pitches can turn a quality start into a batting-practice session; hitters who know what's coming can time fastballs and lay off breaking balls with impunity.

The Diamondbacks' willingness to confirm the episode publicly is unusual. Most clubs prefer to handle such matters internally, wary of drawing attention to a pitcher's vulnerability or of giving future opponents a roadmap. Arizona's acknowledgment suggests either that the issue has already been corrected, or that the club wanted to get ahead of the story before it grew legs.

Berry's role adds a wrinkle. The third-base coach is uniquely positioned to study a pitcher's mechanics from an angle the dugout cannot match, and Berry — a former outfielder with nine years of big-league experience — has the baseball acumen to spot a tell in real time. His ability to relay that information to hitters without leaving the coach's box is perfectly legal, and it underscores the value of a sharp coaching staff.

The Cubs, for their part, did nothing wrong. Baseball has always rewarded observation. If a pitcher is tipping, and a coach notices it from a legal position, the onus is on the pitcher and his catcher to fix it. The Diamondbacks' confirmation that Berry acted legally suggests Arizona understood that, even if the outcome stung.

The numbers

Kelly has been a steady presence in Arizona's rotation this season, though the Diamondbacks did not disclose which outing was affected by the tipping. The lack of a specific game reference makes it difficult to isolate the damage, but the club's public acknowledgment suggests the issue was significant enough to warrant both internal correction and external transparency.

The Diamondbacks are 75-68, second in the NL West and 10.5 games behind the division leader. They are riding a one-game winning streak and remain in the thick of the wild-card race, where every start matters. A pitcher who is tipping his pitches is a liability Arizona cannot afford at this stage of the season.

Where the club stands

Arizona sits at 75-68, second in the NL West and 10.5 games back. The Diamondbacks are in the middle of a series with the Cubs at Chase Field, with Brandon Pfaadt scheduled to start Tuesday and Eduardo Rodriguez set for Wednesday. The club then travels to San Francisco for a three-game set beginning Thursday, with Jose Cabrera slated to take the mound in the opener.

The Diamondbacks' rotation depth will be tested down the stretch, and Kelly's ability to correct the tipping issue quickly will be crucial. Arizona has no margin for error in the wild-card chase, and a pitcher who is broadcasting his pitches is a problem that compounds with every batter.

What we don't know yet

The Diamondbacks did not specify which game Kelly was tipping in, nor did they detail the nature of the tell. It is unclear whether Kelly has since corrected the flaw, or whether Arizona's pitching staff has implemented additional safeguards to prevent future tips.

The club also did not say whether Kelly will remain in the rotation on his usual schedule, or whether Arizona will adjust his workload as he works through the mechanical adjustment. The Diamondbacks' upcoming probables do not list Kelly for the next three games, but that could reflect normal turn-through-the-rotation sequencing rather than any disciplinary or precautionary measure.

What to watch

Kelly's next start will be the first test of whether the tipping issue has been resolved. If he returns to form — missing bats, inducing weak contact, and keeping hitters off balance — the episode will fade into the background. If opposing hitters continue to square him up, Arizona will have to consider whether the problem runs deeper than a single mechanical flaw.

The Diamondbacks' willingness to confirm the tipping publicly may also signal a broader shift in how clubs handle such matters. Transparency can defuse speculation, but it also invites scrutiny. If Kelly struggles in his next outing, every swing-and-miss and every hard-hit ball will be viewed through the lens of whether he is still tipping.

Berry's role, meanwhile, is a reminder that coaching acumen extends beyond in-game strategy and player development. The ability to spot a pitcher's tell in real time, and to relay that information to hitters without crossing ethical or legal lines, is a skill that can swing a game. The Cubs benefited from Berry's sharp eye, and the Diamondbacks paid the price.

Arizona's rotation will need to be airtight down the stretch if the club hopes to secure a playoff berth. Kelly's ability to correct the tipping issue — and to do so quickly — will be a key factor in whether the Diamondbacks can close the gap in the wild-card race. The margin for error is thin, and a pitcher who is broadcasting his pitches is a problem Arizona cannot afford to carry into September.